Table of Content

1. What Is Black Box Testing in Software Engineering? 
2. Black Box vs. White Box Testing 
3. Types Of Black Box Testing 
4. Black Box Functional Testing Techniques 
5. Common Black Box Security Testing Techniques 
6. Black Box Functional Testing: Pros and Cons 
7. Black Box Security Testing: Pros and Cons 
8. When to Choose Black Box Testing in Your QA Strategy
9. Black Box Testing Metrics and How to Measure Effectiveness
10. How Black Box Testing Supports Security Validation
11. Challenges Teams Face When Applying Black Box Testing
12. Best Practices for Effective Black Box Testing 

What Is Black Box Testing in Software Engineering? 

Black box testing involves evaluating the functionality of software without peering into its internal structures or workings. The term “black box” refers to a system where the internal mechanics are unknown, and testing solely focused on the output generated by a given input.

When conducting black box testing, the tester doesn’t need knowledge of the internal structure of the software; the test is conducted from a user’s perspective. This type of testing can be applied to every level of software testing, including unit testing, integration testing, acceptance testing, and security testing.

The primary advantage of black box testing lies in its focus on the user perspective, ensuring that the software meets user requirements and expectations, and cannot be attacked by external malicious parties. It is not concerned with code efficiency or structure, but rather with functionality and usability, which are paramount for the end user.

This is part of a series of a series of articles about application security testing

Black Box vs. White Box Testing 

While black box testing focuses on the functionality without considering the internal structure of the software, white box testing involves the detailed investigation of internal logic and structure of the code.

White box testing is also referred to as “glass box”, “clear box”, or “structural testing”. It requires intricate knowledge of the internal workings of the code being tested. The tester is aware of the internal software structure and designs test cases to cover multiple paths through the software.

The primary difference between the two lies in their approach. While black box testing is input-output driven, white box testing is code driven. Both play a crucial role in software testing and are usually used in conjunction to create robust, reliable software.

Types Of Black Box Testing 

Here are the main types of black box testing:

Functional Testing

Functional testing is a type of black box testing that focuses on validating the software against functional requirements and specifications. It ensures that the software behaves as expected in response to specific inputs. Functional testing is conducted at all levels and includes techniques like unit testing, integration testing, system testing, and acceptance testing.

Non-Functional Testing

While functional testing focuses on what the software does, non-functional testing is concerned with how the software performs. It evaluates aspects like the performance, usability, reliability, and compatibility. Black-box non-functional testing checks these criteria from the end-user’s perspective. For example, a black-box performance test of a website might simulate a user session and measure the actual page load time.

Security Testing

Security testing is a type of black box testing that checks the software for any potential vulnerabilities or security risks. It aims to ensure that the software is secure from any threats and that the data and resources of the system are protected from breaches.

Black-box security testing is performed from the perspective of an external attacker, and can help identify vulnerabilities like injection attacks, denial of service attacks, and other security threats. It ensures that the software is robust enough to prevent and mitigate potential attack vectors.

Black Box Functional Testing Techniques 

Here are a few techniques commonly used to perform black box functionality testing.

Equivalence Partitioning

Equivalence partitioning, also known as equivalence class partitioning (ECP), is a black box testing technique that divides the input data of a software unit into partitions of equivalent data. The primary purpose of this technique is to reduce the number of test cases to a manageable size while still ensuring the coverage of the application.

The primary principle behind equivalence partitioning is that the system should treat all the cases in an equivalence class the same. Therefore, if a test case from an equivalence class passes, the other test cases from the same class are expected to pass. This method helps to identify and eliminate redundant test cases, thereby saving time and resources.

Boundary Value Analysis

Boundary value analysis (BVA) is another black box testing technique used in software engineering. It’s built on the premise that errors most often occur at the boundaries of the input domain rather than the center. This technique involves creating test cases for the boundary values of the input domain. BVA is very effective at identifying errors without requiring testing of every possible value. 

Decision Table Testing

Decision table testing is a systematic and organized black box testing technique used to deal with complex systems. This technique is beneficial when the system’s behavior is different for different combinations of inputs. It’s often used when there are multiple inputs that can have different values and can result in different outputs.

A decision table represents inputs and outputs in a structured, tabular form, making it easy to understand. It ensures the coverage of all possible combinations, thus making the test cases more comprehensive and robust.

State Transition Testing

State transition testing is a black box testing technique used to test the behavior of a software application for different input conditions given in a sequence. It’s particularly useful when software behavior changes from one state to another following particular actions.

This technique uses a state transition diagram to represent the different states of a system and the transitions from one state to another. It can help validate a software application’s behavior when it has a sequence of events or needs to maintain a specific order of events.

Use Case Testing

Use case testing is a black box testing technique that uses use cases to identify test cases. A use case is a description of a system’s behavior as it responds to an end-user’s need or request.

This testing technique helps in identifying all possible scenarios for a particular functionality. It ensures that the system can handle and respond to every request correctly and effectively.

Common Black Box Security Testing Techniques 

Here are a few techniques used to carry out black box security testing.

Fuzzing

Fuzzing, also known as fuzz testing, is a technique that involves providing invalid, unexpected, or random data as input to the software. The aim of this technique is to find crash or exploit vulnerabilities in the software.

Fuzzing is a powerful technique because it can help identify coding errors and security loopholes that might not be visible during regular testing phases. It can help in identifying buffer overflow vulnerabilities, memory leaks, and more.

Penetration Testing

Penetration Testing, often referred to as pentesting, is a technique in which a simulated attack is performed on the software to identify vulnerabilities. A penetration test attempts to breach the security of the software, just like a real-world attacker would do, but without causing damage and with the goal of discovering and mitigating security issues.

This technique is highly beneficial as it allows testers to identify how an attacker could gain access to the software and what vulnerabilities they could potentially exploit.

Dynamic Application Security Testing (DAST)

Dynamic application security testing (DAST) is a black box security testing approach that evaluates a software application in its runtime environment. Unlike other testing techniques that focus on examining the codebase, DAST focuses on the live application, aiming to find vulnerabilities that might be exploited during real-world operations.

DAST tests the application from an external vantage point, much like an attacker would. This means the technique does not require access to the underlying source code, making it particularly useful for applications where the source is not readily accessible. The method provides an immediate feedback loop, allowing vulnerabilities like runtime issues, server misconfigurations, and application environment vulnerabilities to be detected and addressed in real-time.

Web Application Testing

As web applications become a critical asset for many organizations, web application testing is growing in importance. It involves testing web applications to find vulnerabilities or issues that could affect the functionality, performance, or security of the application.

Black box web application testing can help identify issues like SQL injection, cross-site scripting (XSS), and other vulnerabilities. It ensures that the web application is secure, user-friendly, and performs well under different scenarios.

Black Box Functional Testing: Pros and Cons 

Let’s review some of the pros and cons of using black box testing methods for functional testing.

Pros

• Simplicity: Black box testing does not require specific programming knowledge, so it allows virtually anyone to be a tester, including those who may not have a deep understanding of the software’s internal workings. This simplicity also speeds up the testing process, as testers can begin writing test cases as soon as the software’s specifications are complete.
• User-focused: Black box testing encourages testers to disregard the internal system, and to focus on the system’s functionality as a user would. This naturally aligns the focus of testing with the user experience, encouraging testers to discover and understand issues that users would encounter. By focusing on the user experience rather than the technical aspects, black box testing enables creating test cases that more accurately reflect user behavior.
• Efficient for large code bases: Because it is not necessary to understand the code that powers the software, testers can start working without having to understand a large and complex code base. Also, black box test cases can typically be executed even if there is a change in the underlying system functionality.

Cons

• Limited coverage: Since black box testing focuses on the system’s functionality, it can miss errors in the system’s structure or inner workings. For example, black box testing may not effectively detect memory leaks or other issues that occur within the system’s structure.
• Potential for redundancy: Since testers are not privy to the system’s internal structure, they may unknowingly create multiple test cases that check for the same thing. This redundancy can lead to wasted time and resources.
• Difficulty in identifying complex issues: Since black box testing focuses on the system’s functionality, it may overlook complex issues that arise from the system’s structure or internal workings. For example, issues related to concurrency or data consistency might not be easily identifiable through black box testing.

Black Box Security Testing: Pros and Cons 

Pros

• Low chance of false positives: In black box security testing, the tester or testing tool attempts to exploit vulnerabilities from the attacker’s perspective. If an exploit succeeds, there is a high chance that the vulnerability really exists. 
• Reveals hidden vulnerabilities: Another advantage of black box security testing is that it can reveal hidden vulnerabilities. These are issues that may not be apparent during regular operation but could be exploited by malicious individuals or software. 
• Identifies configuration and deployment issues: A configuration issue could be as simple as a setting that’s been left at its default value, potentially opening the door for an attack. Alternatively, a deployment issue could be a component that hasn’t been properly installed or configured.

Cons

• Difficulty in pinpointing root cause: Since black box testers do not have access to the internal workings of the system, they can only identify that a problem exists, not why it exists. This can make it difficult to develop a solution, as the underlying cause of the issue may not be apparent.
• Potential overhead: Running comprehensive black box tests can be resource-intensive, potentially slowing down the system or even causing it to become unresponsive. However, modern dynamic testing tools can operate without slowing down live systems.
• Incomplete coverage: Because black box testing doesn’t have access to the system’s internal code, they can’t check every line for potential vulnerabilities. This means that some issues could slip through the cracks and go unnoticed until they’re exploited by an attacker.

When to Choose Black Box Testing in Your QA Strategy

Black-box testing becomes important as soon as an application ceases being a set of features and starts functioning as a product. When users, APIs, and third-party services become part of the equation, code quality becomes a poor indicator of success. 

Even if your application follows good design practices, its behavior may be difficult to predict once live traffic comes through it. Black box testing looks at just that.

When developers want an independent assessment of their application’s behavior, they tend to use black box testing. There is no bias towards any implementation decisions or expectations regarding any particular internal logic. What is important here is the response that is provided. 

This is precisely why black box testing becomes critical for customer-facing systems and microservice architectures. Much of their behavior depends on service interactions, which cannot always be determined by looking at code. Additionally, black box testing is perfectly applicable in the context of an already integrated application and in continuous integration / continuous delivery pipelines.

Black Box Testing Metrics and How to Measure Effectiveness

Evaluating black box testing should be much more focused on the nature of what is being tested, rather than just metrics based on the number of test cases. One clear metric is the coverage that is achieved in terms of user journeys, API calls, and workflows being tested in realistic scenarios. In general, coverage that is relevant to how things are used in reality is much more useful than a high number of superficial checks.

Another very clear sign of black box testing being effective lies in the findings. As long as black box testing consistently brings up problems that teams are already familiar with because of real-life events, the testing is effective. False positives should also be tracked because otherwise, confidence in the testing process will be rapidly diminished. Test findings must be reproducible and obvious; they must be directly related to the functioning of the application. Over time, teams can also evaluate whether black box testing is reducing the number of regressions or helping to prevent other kinds of errors in production.

The goal of black box testing is not the volume of checks but the confidence that the application functions correctly.

How Black Box Testing Supports Security Validation

Black box testing is very similar to actual attacker behavior because they do not have the luxury of looking at the codebase and design documentation either. Attackers interact with running applications and analyze how those applications react under certain input conditions. The black box testing process works in the same way.

The testing process is especially good for finding flaws that cannot be detected through static code analysis. Those include things like improper access control, authentication bypasses, misuse of workflows, and API abuse. All of these flaws would be difficult to detect while reviewing code, but they can be uncovered once actual attack scenarios are carried out.

Black box testing produces observable results. Security professionals can demonstrate vulnerabilities and how exploits work. There is no need for discussion based on assumptions because all observations are factual and can be easily demonstrated again. For advanced AppSec operations, black box testing is an invaluable asset in the testing toolkit.

Challenges Teams Face When Applying Black Box Testing

Another pitfall is the view of black box testing as a one-off practice. Black box tests conducted before release become obsolete quickly due to the constantly changing nature of modern software systems. In order to be relevant and useful, black box testing should run continuously and adjust with the development of an application.

The problem of scoping also arises quite frequently. Black box tests configured in such a way that authentication areas, APIs, and complex flows are left uncovered can create a deceptive feeling of being complete. Another major difficulty related to black box testing is the problem with findings. Unreproducible or vague results will not be taken into account, no matter how serious the issue might be.

Another possible solution to the problem of ineffective black box testing would be giving up the practice altogether. This option is chosen by most teams after some initial difficulties with implementation. However, in most cases, the problem lies not with black box testing itself but its application. With proper adjustment and focus on the behavior of an application, black box tests can prove to be invaluable.

Best Practices for Effective Black Box Testing 

Understand the Requirements

Before you can effectively test a system, you need to have a comprehensive understanding of the system requirements. This includes understanding the system’s functionality, the data it will process, and the security requirements it must meet. Without a full grasp of these requirements, it’s impossible to create effective test cases.

Having a comprehensive understanding of the requirements also helps you identify potential problem areas in the application. This knowledge allows you to focus your testing efforts on areas that are likely to have the most issues, thereby increasing the effectiveness of your testing procedures.

Prioritize Test Cases

Not all test cases are of equal importance. Some areas of the application are more critical than others and, therefore, should be tested first.

Prioritizing test cases also means focusing on the functionality that is most important to the end-user. This ensures that critical functionalities are thoroughly tested and functioning correctly before the product is released.

Prioritizing test cases is also a way to manage time and resources effectively. By focusing on the most important test cases first, you can ensure that the most critical parts of the application are tested in case time or resources run out.

Use Diverse Input Data

One of the strengths of black box testing is its ability to uncover errors and bugs that might not be identified in other forms of testing. This is largely achieved through the use of diverse input data.

Using diverse input data means testing the system with a wide range of input. This includes both valid and invalid input. The aim is to test the system’s behavior and reaction to different kinds of input.

Collaborate Closely with Development Teams

Black box testing is not a one-man task. It requires close collaboration with the development team. Testers and developers need to work together to understand the system requirements, develop effective test cases, and interpret the test results.

Collaborating closely with the development team also helps in getting quick feedback on the test results. This feedback is crucial in making necessary changes and improvements to the system.

Moreover, the development team can provide important insights and information that can help in the testing process. For instance, they can provide information on the most critical areas of the application, which can help in prioritizing test cases.

Table of Content

1. What Is SAST (Static Application Security Testing)? 
2. What Is DAST (Dynamic Application Security Testing)? 
3. SAST vs. DAST Tools: 5 Key Differences 
4. Combining SAST and DAST for Comprehensive Security 
5. Bright Security: The Ultimate Next-Generation DAST Solution

What Is SAST (Static Application Security Testing)? 

SAST, or Static Application Security Testing, is a type of security testing that examines the application’s source code at a static, or non-running, state. This method of testing is often referred to as “white box” testing because it provides a comprehensive view of the application’s code, allowing for a thorough examination of potential vulnerabilities.

SAST is typically performed early in the development lifecycle, often even before the code is executed. The primary aim of SAST is to identify vulnerabilities and flaws in the software’s code that could potentially lead to security breaches. By reviewing the code in its non-running state, SAST can help identify issues like input validation errors, buffer overflows, and insecure server configurations.

While SAST is a powerful tool for identifying potential security issues, it’s not without its challenges. The static nature of SAST means it can’t identify runtime vulnerabilities, and it can sometimes produce false positives. However, when used correctly and in conjunction with other testing methods, SAST can be a valuable part of a comprehensive security strategy.

What Is DAST (Dynamic Application Security Testing)? 

Dynamic Application Security Testing (DAST), on the other hand, is a “black box” testing methodology. This means that unlike SAST, DAST doesn’t require access to the application’s source code. Instead, DAST tests the application in its running state, simulating the actions of an attacker to identify potential vulnerabilities.

DAST is typically performed later in the development cycle, often just before deployment. It aims to identify vulnerabilities that may not be evident in the source code but can become exploitable once the application is running. This includes vulnerabilities like cross-site scripting (XSS), SQL injection, and insecure server configurations.

While DAST offers a valuable perspective on potential runtime vulnerabilities, it also comes with its set of challenges. DAST can sometimes miss vulnerabilities that are not exploitable in the running state, and it can produce false negatives, for example in the case of business logic vulnerabilities. However, many of these shortcomings are overcome by next-generation DAST solutions.

In this article:

• SAST vs. DAST Tools: 5 Key Differences
  • 1. Stage of Implementation
  • 2. Nature of Testing
  • 3. Depth vs. Breadth
  • 4. Vulnerabilities Detected
  • 5. Potential for False Positives and Negatives
• Combining SAST and DAST for Comprehensive Security

SAST vs. DAST Tools: 5 Key Differences 

1. Stage of Implementation

SAST is implemented at the early stages of the software development lifecycle (SDLC). It analyzes source code or binary code for security vulnerabilities, even before the code is compiled and the application is running. This early detection allows for immediate remediation of potential vulnerabilities, saving time and resources.

On the other hand, DAST, also known as “black box testing,” is implemented after the application is running. It tests the application in its operating environment, simulating real-world attacks to identify vulnerabilities. 

While this approach may seem reactive, it provides a realistic view of the application’s security posture, essential for understanding its behavior under attack. In addition, modern DAST tools can be integrated into the software development lifecycle (SDLC), so they can be run during testing stages, long before the application is in production.

2. Nature of Testing

SAST analyzes the source code or binary code. It examines the application from the inside, looking for common coding errors and security loopholes. It’s a proactive approach that aims to prevent security threats from the ground up.

In contrast, DAST examines the application from the outside. It interacts with the application’s exposed interfaces, treating the application as a black box without any knowledge of its internal workings. This approach detects vulnerabilities that may not be apparent during the development process but could be exploited when the application is in its operating environment.

3. Depth vs. Breadth

SAST provides depth—it can identify vulnerabilities deep within the code, which may not become apparent until specific conditions are met. It provides detailed insights into the code, making it a great tool for developers who want to understand and improve their code’s security.

DAST, meanwhile, offers breadth—it tests the application’s entire exposed surface, identifying vulnerabilities that may arise from the interaction between different parts of the application. DAST tools can be used to test thousands of possible attack patterns. While it may not provide the same level of detail as SAST, it provides a comprehensive view of the application’s security, making it invaluable for assessing the application’s overall risk. 

4. Vulnerabilities Detected

SAST is excellent at detecting issues like buffer overflows, SQL injections, and cross-site scripting (XSS) at the code level. It can also identify insecure coding practices that could potentially lead to security vulnerabilities.

While DAST can also detect these types of vulnerabilities by simulating attacks, it excels in identifying runtime vulnerabilities such as server configuration errors, application-level denial of service (DoS) attacks, and other vulnerabilities that result from the application’s interaction with its environment. It’s invaluable for detecting vulnerabilities that aren’t code-related, which SAST may miss.

5. Potential for False Positives and Negatives

No tool is perfect, and both SAST and DAST have their potential for false positives and negatives. False positives—where the tool incorrectly identifies a vulnerability—are common in SAST due to its in-depth code analysis. It can sometimes misinterpret safe code as vulnerable, leading to unnecessary remediation efforts.

DAST, on the other hand, has a higher likelihood of false negatives—where it fails to detect a real vulnerability. Its black-box approach can miss vulnerabilities hidden deep within the application’s code or those that only become apparent under specific conditions. 

However, DAST’s false positives are generally lower than SAST as it tests the application in its running state, providing a more realistic view of potential vulnerabilities. In addition, next-generation DAST solutions use fuzzing and AI technology to reduce false positives and negatives to virtually zero.

Related content: Read our guide to DAST tools

Combining SAST and DAST for Comprehensive Security 

While SAST and DAST have their differences, they are not mutually exclusive. In fact, using them in conjunction provides a more comprehensive view of the application’s security, addressing the limitations of each tool.

Incorporating both SAST and DAST into the SDLC can significantly enhance the security coverage. SAST can be used in the early development stages to identify and rectify potential vulnerabilities at the code level. DAST can then be implemented once the application is running, to detect any runtime vulnerabilities and assess the application’s behavior under attack conditions.

This combination provides a holistic view of the application’s security, ensuring that both code-level and runtime vulnerabilities are identified and mitigated. It allows for a proactive and reactive approach to security, ensuring that all bases are covered.

Related content: Read our guide to dast vs penetration testing.

Bright Security: The Ultimate Next-Generation DAST Solution

Bright Security tests every aspect of your apps. It enables you to scan any target, including web applications, internal applications, APIs (REST/SOAP/GraphQL), websockets, and server side mobile applications. It seamlessly integrates with the tools and workflows you already use, automatically triggering scans on every commit, pull request or build with unit testing. Scans are blazing fast, enabling Bright to work in a high velocity development environment.

Instead of just crawling applications and guessing, Bright interacts intelligently with applications and APIs. Our AI-powered engine understands application architecture and generates sophisticated and targeted attacks. By first verifying and exploiting the findings, we make sure we don’t report any false positives. 

Key features include:

• Seamlessly integrates with existing tools and workflows—works with your existing CI/CD pipelines. Trigger scans on every commit, pull request or build with unit testing.
• Spin-up, configure and control scans with code—one file, one command, one scan with no need for UI-based configuration.
• Super-fast scans—interacts with applications and APIs, instead of just crawling them and guessing. Scans are made faster by an AI-powered engine that can understand application architecture and generate sophisticated and targeted attacks.
• No false positives—uses AI analysis and fuzz testing to avoid returning false positives, so developers and testers can focus on releasing code.

Get a free plan and try Bright Security today!

Table of Content

1. Risk of Downtime
2. Data Sensitivity
3. False Positives and Alert Fatigue
4. Impact on User Experience
5. Regulatory and Compliance Issues
6. Shift Testing Left with Integrated Development Environment (IDE) Integration
7. Early Detection of Vulnerabilities
8. Seamless Developer Experience
9. Real-Time Feedback
10. Improved Collaboration between Security and Development Teams
11. Automation and CI/CD Integration
12. Contextual Understanding
13. Reduced Risk
14. Conclusion

Dynamic Application Security Testing (DAST) has long been a cornerstone of application security, helping organizations find and fix vulnerabilities in their applications and APIs. While DAST is typically run early in the software development lifecycle (SDLC), there are some proponents in the industry evangelizing the value of running DAST in production exclusively. Their arguments typically center around DAST scans breaking builds and slowing down the development process. 

However, the practice of running DAST in production environments rather than early in the SDLC presents multiple risks and challenges that can actually hinder your security goals. Here’s why you should think twice before running DAST scans on a live production system.

Risk of Downtime

DAST solutions are designed to find vulnerabilities by simulating attack behaviors. While this is effective for uncovering weaknesses, it can also put a strain on your system resources. Running DAST in a production environment risks causing performance degradation, and in the worst-case scenario, could even bring down the application. System downtime leads to customer dissatisfaction, loss of business, and could tarnish your brand reputation.

Data Sensitivity

DAST tests often include data manipulation to check how an application behaves when faced with unexpected or malicious input. When these tests are conducted in a production environment, they interact with live and often sensitive data. Even if the DAST tool itself is secure, there is still a risk that the test could inadvertently expose or corrupt this sensitive data, which could be a compliance issue.

False Positives and Alert Fatigue

Legacy DAST tools are well-known for not always being precise in their findings to say the least. Running these tools in a production environment will inevitably generate alerts. The notorious problem arises when these alerts include false positives, which need to be triaged and checked manually. This leads to alert fatigue among application security teams, who may then miss genuinely critical alerts amid the noise.

Impact on User Experience

DAST in a production environment can result in degraded performance, leading to a poor user experience. Even short periods of sluggish performance or downtime can result in immediate negative customer feedback, and in today’s digital age, customer experience is paramount. 

Regulatory and Compliance Issues

Regulatory standards like GDPR, HIPAA, and PCI DSS have stringent requirements for how data is handled and secured. Running DAST scans in production could risk non-compliance with these regulations, leading to legal issues and fines.

So what’s the alternative? Here’s a better approach:

Shift Testing Left with Integrated Development Environment (IDE) Integration

Running Dynamic Application Security Testing (DAST) from an Integrated Development Environment (IDE) offers several compelling advantages that can significantly streamline the development process, enhance security, and contribute to more robust, resilient applications. Here’s why it’s a good idea:

Early Detection of Vulnerabilities

The earlier a vulnerability is detected in the Software Development Life Cycle (SDLC), the cheaper and simpler it is to fix. Running DAST from an IDE allows developers to find and address vulnerabilities as they write code, essentially “shifting left” in the SDLC. This early detection helps to ensure that security is integrated into the development process right from the start. Industry research clearly shows that fixing vulnerabilities in production can easily cost ten times more than earlier in the development lifecycle. 

Seamless Developer Experience

For developers, the IDE is their main workspace where they spend most of their time coding, debugging, and testing. Being able to run DAST scans directly from the IDE eliminates the need to switch between different tools, thereby providing a more seamless and efficient user experience. This integration also makes it easier for developers to adopt security testing as a regular part of their workflow.

Real-Time Feedback

Running DAST from an IDE allows for real-time, immediate feedback. As developers write or modify code, they can run quick scans to assess the security impact of their changes. This real-time feedback loop enables developers to understand the security implications of their code as they write it, enhancing both the learning process and the quality of the resulting application.

Improved Collaboration between Security and Development Teams

Embedding DAST within the IDE makes security more accessible for developers, which can foster better collaboration between Application Security (AppSec) and development teams. When developers are equipped with the tools to perform initial security tests themselves, it frees up security teams to focus on more advanced threats and vulnerabilities, making the entire process more efficient.

Automation and CI/CD Integration

When DAST is integrated into an IDE, it can also be easily incorporated into Continuous Integration/Continuous Deployment (CI/CD) pipelines. This enables automated security testing as part of the build process, further ensuring that applications are secure well before they are deployed.

Contextual Understanding

Running DAST scans within an IDE allows developers to see security issues in the context of their code. Unlike running scans on a deployed application where the results may be somewhat abstract, scanning within the IDE allows developers to directly relate the issues to the code they are working on, facilitating quicker and more accurate remediation.

Reduced Risk

By catching vulnerabilities early and incorporating security into the daily workflow of developers, running DAST from an IDE significantly reduces the risk of insecure code making it to production. This not only protects your organization from potential breaches but also from the reputational damage and regulatory fines that can come with security incidents.

Integrating DAST into the IDE creates a more agile, efficient, and secure development process. It allows for early vulnerability detection, encourages a culture of security, and ultimately leads to the creation of more secure applications.

Conclusion

DAST remains a vital tool in any application security toolkit but running these tests in production environments poses more risks than benefits and is not a best practice. By taking a more strategic approach that involves early-stage testing, continuous monitoring, and leveraging alternative testing methods, organizations can maintain the integrity and security of their applications without compromising their production environments. Integrating DAST into the IDE creates a more agile, efficient, and secure development process. It allows for early vulnerability detection, encourages a culture of security, and ultimately leads to the creation of more secure applications.

Table of Content

1. What Is Cloud Native Security? 
2. Cloud Native Security Challenges 
3. 5 Pillars of Cloud Native Application Security 
4. Best Practices for Cloud Native Security Platforms 

What Is Cloud Native Security? 

Cloud Native Security refers to the practice of safeguarding cloud native  applications. These applications are designed to take advantage of cloud computing’s full potential, leveraging the benefits of scalability, flexibility, and speed. Cloud native applications are typically composed of microservices, packaged in containers, and orchestrated through automated systems. These components introduce new layers of complexity to security, making traditional security measures insufficient.

The importance of cloud native security lies in its ability to protect and secure the entire lifecycle of these applications, from the coding and building stages to the deployment and runtime stages. It goes beyond protecting the application itself, ensuring the infrastructure it runs on is secure.

This is part of a series of articles about DevSecOps.

In this article:

• Cloud Native Security Challenges
  • Microservices Complexity
  • Container Security
  • API Security
  • Managing Secrets and Configuration Data
  • Compliance and Regulatory Requirements
• 5 Pillars of Cloud Native Application Security
  • 1. Defense in Depth
  • 2. Least Privilege
  • 3. Immutable Infrastructure
  • 4. Continuous Monitoring and Automation
  • 5. Secure Software Development Lifecycle (SDLC)
• Best Practices for Cloud Native Security Platforms 
  • Secure Configuration and Patch Management
  • Network Security and Segmentation
  • Data Security and Encryption
  • Logging and Auditing
  • Regular Security Assessments

Cloud Native Security Challenges 

Microservices Complexity

Microservices have revolutionized the way we develop applications. However, this architectural style introduces a new set of security challenges. With microservices, applications are broken down into smaller, independently deployable services. These services communicate with each other over the network, which significantly increases the attack surface.

Each microservice has its own set of dependencies, configurations, and data storage, making it difficult to manage and secure them at scale. Additionally, the dynamic nature of microservices, where services are continuously added, removed, or updated, further complicates the security landscape.

Container Security

Containers are the backbone of cloud native  applications. They encapsulate microservices and their dependencies into a standalone unit, providing a consistent and reproducible environment. However, container security is a significant challenge in cloud native security.

The ephemeral nature of containers, where they can be created and destroyed in seconds, makes it difficult to perform traditional security measures like patching and vulnerability scanning. Additionally, containers share the host operating system’s kernel, making them vulnerable to kernel-level attacks. Misconfigurations, such as running containers with root privileges or using insecure container images, can also lead to security breaches.

Learn more in our detailed guide to devsecops tools.

API Security

APIs are the glue that holds microservices together. They provide a means for services to communicate with each other and external systems. However, APIs are also a prime target for attackers. Insecure APIs can lead to data breaches, unauthorized access, and denial of service attacks.

Securing APIs in a cloud native  environment is challenging due to their dynamic and distributed nature. Traditional security measures like firewalls and intrusion detection systems are not sufficient. Instead, security needs to be built into the APIs themselves, using techniques like authentication, authorization, encryption, and rate limiting.

Managing Secrets and Configuration Data

Secrets such as API keys, passwords, and certificates are essential for securing communication between services. Similarly, configuration data, which includes information like database connections and environment variables, is crucial for the proper functioning of applications.

Managing secrets and configuration data in a cloud native  environment is a complex task. Secrets need to be securely stored, distributed, and rotated, while configuration data needs to be managed across multiple services and environments. Mismanagement of secrets and configuration data can lead to security breaches and operational failures.

Related content: Read our guide to devops testing.

Compliance and Regulatory Requirements

Compliance and regulatory requirements add another layer of complexity to cloud native security. Organizations need to ensure their cloud native  applications comply with regulations like GDPR, HIPAA, and PCI DSS.

Compliance involves aspects like data protection, access control, and audit logging. However, the dynamic and distributed nature of cloud native  applications makes compliance a challenging task. Organizations need to implement automated compliance checks and continuous monitoring to ensure their applications remain compliant.

https://brightsec.com/blog/devops-testing

5 Pillars of Cloud Native Application Security 

1. Defense in Depth

Defense in depth involves implementing multiple layers of security controls to protect against threats. If one layer is compromised, the attacker still has to bypass additional layers to achieve their goal.

In a cloud native  environment, defense in depth can be achieved through a combination of network security, application security, and data security measures. This includes techniques like micro-segmentation, container hardening, API security, encryption, and access control.

2. Least Privilege

The principle of least privilege states that a user or process must have only the minimum privileges necessary to perform its function. In a cloud native  environment, least privilege can be applied at multiple levels. 

For example, containers should be run with the least privileges necessary, and access to APIs and data should be limited based on the principle of least privilege. Applying this principle reduces the potential impact of a security breach, as an attacker can only access limited resources.

3. Immutable Infrastructure

The concept of an immutable infrastructure refers to an environment where no updates, security patches, or configuration changes happen on live systems. Instead, new versions of infrastructure components are created and deployed to replace old ones. This approach reduces the risk of unauthorized changes and configuration drift, enhancing overall system security.

Immutable infrastructure requires a shift in how we approach system management. By treating infrastructure as disposable, we minimize the chances of vulnerabilities caused by system configuration changes. This concept is integral to cloud native security, and it’s a significant departure from traditional IT practices, which often involve manually updating and maintaining systems.

4. Continuous Monitoring and Automation

Continuous monitoring involves the ongoing observation of cloud-based applications and infrastructure to detect potential security threats. This real-time visibility is crucial for identifying and addressing issues before they become significant problems.

Automation, on the other hand, ensures that routine tasks are performed quickly and accurately, reducing human error. In terms of security, automation can be used to apply patches, enforce policies, and respond to incidents. The combination of continuous monitoring and automation allows for a highly responsive and proactive security stance, essential in today’s fast-paced, constantly evolving digital landscape.

5. Secure Software Development Lifecycle (SDLC)

A secure SDLC incorporates security considerations into every stage of software development, from planning and design to implementation and maintenance. This approach reduces the risk of vulnerabilities being introduced into the software, making it inherently safer.

A secure SDLC encourages developers to think about security from the outset, rather than as an afterthought. It involves practices such as threat modeling, secure coding, and regular security testing. By integrating security into the development process, cloud native applications are better equipped to withstand cyber threats.

Learn more in our detailed guide to SDLC security (coming soon)

Best Practices for Cloud Native Security Platforms 

Secure Configuration and Patch Management

Maintaining a secure configuration for cloud native applications requires proactive patch management. This involves regularly updating and patching software to protect against known vulnerabilities. In a cloud native environment, automation can be leveraged to streamline this process, ensuring that patches are applied promptly and consistently.

Secure configuration also involves limiting access to systems and data. This includes implementing least privilege access controls, ensuring that users and systems have only the permissions they need to carry out their tasks. By taking a proactive approach to configuration and patch management, you can significantly enhance your cloud native security posture.

Network Security and Segmentation

Network security involves protecting the integrity and usability of network and data. It includes practices such as using firewalls, intrusion detection systems, and secure network protocols.

Segmentation, on the other hand, involves dividing a network into smaller parts to limit the potential impact of a breach. If a threat actor gains access to one part of the network, they won’t automatically have access to all areas. This approach, known as micro-segmentation in the cloud native  environment, helps to limit the lateral movement of threats and contain potential breaches.

Data Security and Encryption

Data is the lifeblood of any organization, and securing it is of paramount importance. In the context of cloud native security, this involves using encryption to protect data at rest and in transit. Encryption converts data into a format that can only be read with a valid decryption key, protecting it from unauthorized access.

Data security also involves practices such as data classification, where data is categorized based on its sensitivity, and access controls, which limit who can access certain data. By implementing robust data security measures, you can ensure that your organization’s most valuable assets are well-protected.

Logging and Auditing

Logging involves recording events that happen within your systems, while auditing involves reviewing these logs to identify any unusual or suspicious activity. Logs can provide valuable insights into security incidents, helping you understand what happened and how to prevent similar incidents in the future. 

Auditing, meanwhile, can help you ensure compliance with security policies and regulations. By regularly reviewing logs and conducting audits, you can maintain a strong security posture and respond effectively to any potential threats.

Regular Security Assessments

Regular security assessments involve evaluating your security controls to identify any weaknesses or gaps. They can take the form of vulnerability scans, penetration tests, or security audits.

Regular security assessments are crucial for staying ahead of the ever-evolving threat landscape. They allow you to identify and address vulnerabilities before they can be exploited, ensuring that your cloud native  applications and infrastructure remain secure.

Learn more about Bright Security

Table of Content

1. What Is Unit Testing?
2. How Unit Tests Work
3. Benefits of Unit Testing
4. How Does Unit Testing Compare to Other Types of Testing?
5. Can You Use Unit Testing for Security?
6. Unit Testing Techniques
7. Unit Testing Examples
8. Unit Testing Best Practices
9. Unit Testing with Bright
10. How Unit Tests Fit into the Software Development Lifecycle
11. What Common Mistakes Developers Make with Unit Testing
12. How Unit Tests Improve Code Quality and Maintainability
13. Unit Testing Tools and Frameworks for Popular Languages
14. See Additional Guides on Key Software Development Topics

What Is Unit Testing?

A unit test is a type of software test that focuses on testing individual components of a software product. Software developers and sometimes QA staff write unit tests during the development process.

The ‘units’ in a unit test can be functions, procedures, methods, objects, or other entities in an application’s source code. Each development team decides what unit is most suitable for understanding and testing their system. For example, object-oriented design tends to treat a class as the unit. Unit testing relies on mock objects to simulate other parts of code, or integrated systems, to ensure tests remain simple and predictable.

The main goal of unit testing is to ensure that each unit of the software performs as intended and meets requirements. Unit tests help make sure that software is working as expected before it is released. 

The main steps for carrying out unit tests are: 

1. Planning and setting up the environment
2. Writing the test cases and scripts
3. Executing test cases using a testing framework
4. Analyzing the results

Some advantages of unit testing include: 

• Early detection of problems in the development cycle
• Reduced cost
• Test-driven development
• More frequent releases
• Enables easier code refactoring
• Detects changes which may break a design contract
• Reduced uncertainty
• Documentation of system behavior

Learn more in our detailed guide to unit testing vs integration testing.

This is part of an extensive series of guides about Software Development.

In this article:

• How Unit Tests Work
• Why Unit Testing Is Important
• How Does Unit Testing Compare to Other Types of Testing?
  • Unit Testing vs Integration Testing
  • Unit Testing vs Functional Testing
  • Unit Testing vs Regression Testing
• Can You Use Unit Testing for Security?
• Unit Testing Techniques
• Unit Testing Examples
  • Android Unit Testing
  • Angular Unit Testing
  • Node JS Unit Testing
  • React Native Unit Testing
• Unit Testing Best Practices
  • Write Readable Tests
  • Write Deterministic Tests
  • Unit Tests Should Be Automated
  • Don’t Use Multiple Asserts in a Single Unit Test
• Security Unit Testing with Bright Security

How Unit Tests Work

Unit tests usually consist of four phases: 

1. Planning and setting up the environment—developers consider which units in the code they need to test, and how to execute all relevant functionality of each unit to test it effectively.
2. Writing the test cases and scripts—developers write the unit test code and prepare the scripts to execute the code.
3. Executing the unit testing—the unit test runs and reveals how the code behaves for each test case.
4. Analyzing the results—developers can identify errors or issues in the code and fix them.

Test-driven development (TDD) is a common approach to unit testing. It requires the developer to create the unit test first, before the application code actually exists. Naturally, that initial test will fail. Then the developer adds the relevant functionality to the application until the tests pass. TDD usually results in a high quality, consistent codebase.

Effective unit testing typically:

• Runs each test case in an isolated manner, with “stubs” or “mocks” used to simulate external dependencies. This ensures the unit tests only considers the functionality of the current unit under test.
• Does not test every line of code, focusing on critical features of the unit under test. In general, unit testing should focus on code that affects the behavior of the overall software product.
• Verifies each test case using criteria determined in code, known as “assertions”. The testing framework uses these to run the test and report failed tests. 
• Runs frequently and early in the development lifecycle.

When a software project has been thoroughly unit tested, developers know that each individual unit is efficient and error-free. The next step is to run integration tests that evaluate larger components of the program and how they interact.

Benefits of Unit Testing

Advantages of unit testing include:

• Detecting problems early in the development cycle—unit testing helps in identifying bugs and issues at an early stage of the software development cycle. This early detection is crucial as it allows for issues to be addressed before they escalate into more complex problems in later stages of development.
• Reducing costs—by catching bugs early, unit testing can significantly reduce the cost of bug fixes. It is generally more expensive to fix bugs in later stages of development or after the software has been deployed.
• Promoting test-driven development—unit testing is a core component of TDD, where tests are written before the actual code. This approach ensures that the codebase is designed to pass the tests, leading to better structured, more reliable, and easier to maintain code.
• Enabling more frequent releases—with a comprehensive suite of unit tests, developers can make changes to the code with more confidence. This reduces the risks associated with new releases, thereby allowing for more frequent updates and improvements to the software.
• Enabling code refactoring—unit tests provide a safety net that allows developers to refactor code with confidence. Knowing that changes can be quickly tested to ensure they don’t break existing functionality encourages improving and optimizing the code without fear of introducing bugs.
• Detecting changes that break a design contract—unit tests can help in identifying changes in the code that may violate the intended design or contract of a system. This ensures that individual components of the software work as expected and in harmony with each other.
• Reducing uncertainty—with a robust unit testing process, developers gain confidence in the quality and functionality of their code. This reduces uncertainty and guesswork, especially when making changes or adding new features.

Documenting system behavior—unit tests can serve as a form of documentation for the system. By reading the tests, other developers can understand what a particular piece of code is supposed to do, which is especially useful for onboarding new team members or for reference in future development.

How Does Unit Testing Compare to Other Types of Testing?

Unit Testing vs. Integration Testing

Integration testing involves testing software modules and the interaction between them. It tests groups of logically integrated modules.

Integration tests are also called thread testing, because they focus on communication between software components. Integration testing is important because most software projects consist of several independent, connected modules. 

The main difference between unit tests and integration tests is what and how they test: 

• Unit tests test a single piece of code, while integration tests test modules of code to understand how they work individually and interact with each other.
• Unit tests are fast and easy to run because they “mock out” external dependencies. Integration tests are more complex and require more resources to run because they must consider both internal and external dependencies (“real” dependencies).

Learn more in our detailed guide to unit testing vs. integration testing (coming soon)

Unit Testing vs. Functional Testing

Functional testing compares the capabilities of each software to the original specifications or user requirements, to ensure that it provides the desired output to end users.

Software developers use functional testing as a way to perform quality assurance (QA). Typically, if a system passes the functional tests, it is considered ready to release. Functional testing is important because it tries to closely mirror the real user experience, so it verifies that the application meets the customer’s requirements.

The difference between unit testing and functional testing can be summarized as follows:

• Unit tests are designed to test single units of code in isolation. They are quick and easy to create, and help find and fix bugs early in the development cycle. They are typically run together with every software build. However, they are not a substitute for functional testing because they do not test the application end-to-end.
• Functional testing aims to test the functionality of an entire application. It is time consuming to create and requires significant computing resources to run, but is highly useful for testing the entire application flow. Functional testing is an essential part of an automated test suite, but is typically used later in the development lifecycle, and run less frequently than unit tests.

Learn more in our detailed guide to unit testing vs. functional testing (coming soon)

Unit Testing vs Regression Testing

Regression testing is a type of software testing that evaluates whether a change in the application introduced defects. It is used to determine if code changes can harm or interfere with the way an application behaves or consumes resources. In general, unit tests are regression tests, but not all regression tests are unit tests. 

Unit tests are used by developers to verify the functionality of various components in their code. This ensures that all variables, functions, and objects work as expected.

Regression tests are primarily used after a programmer has completed a certain feature. Regression testing serves as a system-wide check to ensure that components that were not affected by a recent change continue to work as expected. It can include several types of tests. As part of a regression test suite, developers can run unit tests, to verify that individual features and variables behave as expected even after the change. 

Learn more in our detailed guide to unit testing vs. regression testing (coming soon)

Can You Use Unit Testing for Security?

It is common to create unit tests during development. However, these tests typically only test functionality and not other aspects of the code, such as security. Many organizations are adopting a “shift left” approach in which important aspects of a software project must be tested as early as possible in the software development lifecycle, when it is easy to remediate them. 

Writing security unit tests is a great way to shift left security, ensuring that developers catch security flaws in their software before a component even enters a testing environment – not to mention a production environment.

Security unit tests take the smallest testable unit of software in an application, and determine whether its security controls are effective. Developers should build security unit tests based on known security best practices for the programming language and framework, and the security controls identified during threat modeling.

Another best practice is to perform peer reviews between developers and application security specialists. Allowing peer review of selected test strategies and individual security tests helps detect edge cases and logical flaws that individual testers might miss. Peer reviews of testers are also a great opportunity for developers, testers, and security experts to learn from each other and expand their knowledge on latest threats and new development techniques.

Unit Testing Techniques

Structural Unit Testing

Structural testing is a white box testing technique in which a developer designs test cases based on the internal structure of the code, in a white box approach. The approach requires identifying all possible paths through the code. The tester selects test case inputs, executes them, and determines the appropriate output. 

Primary structural testing techniques include:

• Statement, branch, and path testing—each statement, branch, or path in a program is executed by a test at least once. Statement testing is the most granular option.
• Conditional testing—allows a developer to selectively determine the path executed by a test, by executing code based on value comparisons.
• Expression testing—tests the application against different values of a regular expression.

Related content: Read our guide to unit testing javascript.

Functional Unit Testing

Functional unit testing is a black box testing technique for testing the functionality of an application component. 

Main functional techniques include:

• Input domain testing—tests the size and type of input objects and compares objects to equivalence classes.
• Boundary value analysis—tests are designed to check whether software correctly responds to inputs that go beyond boundary values.
• Syntax checking—tests that check whether the software correctly interprets input syntax.
• Equivalent partitioning—a software testing technique that divides the input data of a software unit into data partitions, applying test cases to each partition.

Error-based Techniques

Error-based unit tests should preferably be built by the developers who originally designed the code. Techniques include:

• Fault seeding—putting known bugs into the code and testing until they are found.
• Mutation testing—changing certain statements in the source code to see if the test code can detect errors. Mutation tests are expensive to run, especially in very large applications.
• Historical test data—uses historical information from previous test case executions to calculate the priority of each test case.

Unit Testing Examples

Different systems support different types of unit tests. 

Android Unit Testing

Developers can run unit tests on Android devices or other computers. There are two main types of unit tests for Android.

Instrumented tests can run on any virtual or physical Android device. The developer builds and installs the application together with the test application, which can inject commands and read the application state. An instrumented test is typically a UI test that launches an application and interacts with it. 

A small instrumented test verifies the code’s functionality within a given framework feature (i.e., SQLite database). The developer might run these tests on different devices to assess how well the app integrates with different SQLite versions. 

Local unit tests run on the development server or computer. These are typically small, fast host-side tests that isolate the test subject from the other parts of the application. Big local unit tests involve running an Android simulator (i.e., Robolectric) locally on the machine. 

Here is an example of a typical UI interaction for an instrumented test. The tester clicks on the target element to verify that the UI displays another element:

// If the Start button is clicked
onView(withText("Start"))
    .perform(click())

// Then display the Hello message
onView(withText("Hello"))
    .check(matches(isDisplayed()))

The following snippet demonstrates part of a local, host-side unit test for a ViewModel:

// If given a ViewModel1 instance
val viewModel = ViewMode1(ExampleDataRepository)

// After loading data
viewModel.loadData()

// Expose data
assertTrue(viewModel.data != null)

Angular Unit Testing

Angular unit tests isolate code snippets to identify issues like malfunctions and incorrect logic. Executing a unit test in Angular can be especially challenging for a complex project with inadequately separated components. Angular helps developers write code in a manner that lets them test each application function separately.

Angular’s testing package offers two utilities: TestBed and async. TestBed is Angular’s main utility package.

The “describe” container includes multiple blocks, such as it, xit, and beforeEach. The “beforeEach” block runs first, but the rest of the blocks can run independently. The first block from the app.component.spec.ts file is beforeEach (within the describe container) and has to run before the other blocks. 

Angular declares the application module’s declaration from the app.module.ts file in the beforeEach block. The application component simulated/declared in beforeEach is the most important component for the testing environment. 

The system then calls the compileComponents element to compile all the component resources, such as styles and templates. The tester might not compile the component when using a web pack. The code should look like this:

beforeEach(async(() => {
   TestBed.configureTestingModule({
      declarations: [
         AppComponent
      ],
   }).compileComponents();
}));

Once the target component is declared in the beforeEach block, the tester can verify if the system created the component using the it block.

The fixture.debugElement.componentInstance element will create an instance of the AppComponent class. Testers can use toBeTruthy to test if the system truly creates the class instance:

it('creates the app', async(() => {
    const fixture = TestBed.createComponent(AppComponent);
    const app = fixture.debugElement.componentInstance;
    expect(app).toBeTruthy();
}));

The next block shows the access to the app component properties. By default, the system only adds the title property. The tester can easily verify the title’s consistency in the created component: 

it(`title should be 'angular-unit-test'`, async(() => {
     const fixture = TestBed.createComponent(AppComponent);
     const app = fixture.debugElement.componentInstance;
     expect(app.title).toEqual('angular-unit-test');
}));

The fourth block in the test string demonstrates the test’s behavior in a browser environment. Once the system creates a detectChanges component, it calls an instance of the component to simulate execution in the browser environment. After rendering the component, it is possible to access its child elements via the nativeElement object:

it('render title in h1 tag', async(() => {
   const fixture = TestBed.createComponent(AppComponent);
   fixture.detectChanges();
   const compiled = fixture.debugElement.nativeElement;
 expect(compiled.querySelector('h1').textContent).toContain('Welcome to angular-unit-test!');
}));

Learn more in our detailed guide to unit testing in angular.

Node JS Unit Testing

Node.js allows developers to execute server-side JavaScript code. It is an open source platform that integrates with popular JavaScript testing frameworks such as Mocha. Testers can indicate that the code they inject is a test by inserting Mocha test API keywords.

For example, it() indicates that the code is a single test, while describe() indicates that it contains a group of test cases. There can be subgroups within a describe() test grouping. Each function takes two arguments: a description displayed in the test report and a callback function.

Here is an example or the most basic test suite with a single test case:

const {describe} = require('mocha');
const assert = require('assert');

describe('Simple test suite:', function() {
    it('1 === 1 should be true', function() {
        assert(1 === 1);
    });
});

The test’s output should look like this:

$ cd src/projects/IBM-Developer/Node.js/Course/Unit-9
$ ./node_modules/.bin/mocha test/example1.js

  Simple test suite:
    ✓ 1 === 1 should be true

  1 passing (5ms)

Mocha supports any assertion library. This example uses the Node assert module (a relatively less expressive library). 

Related content: Read our guide to unit testing in nodejs.

React Native Unit Testing

React Native is an open source mobile app development framework for JavaScript-based applications. It has a built-in Jest testing framework. Developers can use Jest to ensure the correctness of their JavaScript codebase.

Jest is usually pre-installed on React Native applications as an out-of-the-box testing solution. The developer can easily open the package.json file and configure the Jest preset to React Native:

"scripts": {
            "test": "jest"
},
"jest": {
         "preset": "jest-react-native"
}

If, for example, the application has a function to add simple numbers, the tester can easily anticipate the correct result. It is easy to test by importing the sum function into the test file. The separate file containing the sum function might be called ExampleSumTest.js:

const ExampleSum = require('./ExampleSum');

test('ExampleSum equals 3', () => {
      expect(ExampleSum(1, 2).toBe(3);
});

The predicted Jest output should look like this:

PASS ./ExampleSumTest.js
✓ ExampleSum equals 3 (5ms)

Learn more in our detailed guide to vue unit testing.

Unit Testing Best Practices

Here are best practices you can use to make your unit testing more effective.

Learn more in our detailed guide to unit testing vs functional testing.

Write Readable Tests

Easy-to-read tests help other developers understand how code works, what it’s intended for, and what went wrong if a test fails. Readable tests tend to have less bugs, and if they do contain issues, they are much easier to troubleshoot without extensive debugging. 

Readability also improves the maintainability of tests, making it easier to update tests when the underlying code changes.

Another aspect of readability is that unit tests serve as documentation for describing and verifying various aspects of code unit behavior. So, making the tests clear and easy to read make it possible for new developers joining the team, or developers from other teams, to understand how the underlying code works.

Write Deterministic Tests

A deterministic test always passes (if there are no issues) or always fails (when issues exist) on the same piece of code. The result of the test should not change as long as you don’t change your code. By contrast, an unstable test is one that may pass or fail due to various conditions even if the code stays the same. 

Non-deterministic tests, also known as flaky tests, are not effective because they cannot be trusted by developers. They do not effectively report on bugs in the unit under test, and they can cause developers to ignore the result of unit tests (including those that are stable). 

To avoid non-deterministic testing, tests should be completely isolated and independent of other test cases. You can make tests deterministic by controlling external dependencies and environment values, such as calls to other functions, system time, and environment variables.

Unit Tests Should Be Automated

Make sure tests run in an automated process. This can be done daily, hourly, or through a continuous integration (CI) process. Everyone on the team should be able to access and view the reports. 

As a team, discuss the metrics you are interested in, such as code coverage, number of test runs, test failure rate, and unit test performance. Continuously monitor these metrics—a large change in a metric can indicate a regression in the codebase that should be dealt with immediately.

Related content: Read our guide to unit testing best practices.

Don’t Use Multiple Asserts in a Single Unit Test

For unit tests to be effective and manageable, each test should have only one test case. That is, the test should have only one assertion. 

It sometimes appears that to properly test a feature, you need several assertions. The unit test might check each of these assertions, and if all of them pass, the test will pass. However, when the test fails, this makes it unclear what is the root cause of the bug. This also means that when one assertion fails, the others are not checked, which may leave unattended issues in the code.

Creating a separate test script for each assertion might seem tedious, but overall it saves time and effort and is more reliable. You can also use parameterized tests to run the same test multiple times with different values.

Unit Testing with Bright

Bright is a developer-first Dynamic Application Security Testing (DAST) scanner, the first of its kind to integrate into unit testing, revolutionizing the ability to shift security testing even further left. You can now start to test every component / function at the speed of unit tests, baking security testing across development and CI/CD pipelines to minimize security and technical debt, by scanning early and often, spearheaded by developers. With NO false positives, start trusting your scanner when testing your applications and APIs (SOAP, REST, GraphQL), built for modern technologies and architectures. Sign up now for a free account and read our docs to learn more.

How Unit Tests Fit into the Software Development Lifecycle

In real teams, unit tests usually start as a way to avoid accidentally breaking things. A developer writes a feature, adds a few tests, and pushes the code, hoping nothing explodes later. That’s actually where unit tests fit best – right at the moment code is written, not weeks after.

When unit tests run as part of the normal workflow, they catch problems early, while the code is still familiar. Fixing a bug at this stage is quick. Waiting until QA or production is where things get painful. Over time, teams that rely on unit tests tend to ship changes more confidently because they have a basic safety net.

Unit tests don’t replace other testing. They just make everything else easier. If the basics are solid, integration tests and security checks can focus on bigger risks instead of obvious breakage.

What Common Mistakes Developers Make with Unit Testing

A very common error is creating unit tests just for the sake of meeting a coverage criterion. Such tests may exist, yet they are not trusted at all. 

These tests always pass regardless of whether the feature works or not, thus rendering the whole purpose meaningless. Yet another problem concerns tests that are overly tied to implementation details of the code. Changing an internal variable causes ten tests to fail despite no changes in functionality.

Mocking may also be abused by some developers to such an extent that everything gets mocked, nothing works like in reality, but still the tests pass. 

From another angle, tests can become excessively large and slow, thus becoming miniature integration tests that people are reluctant to run on their local machine.

The most significant mistake, however, consists in neglecting tests altogether once the deadline approaches.

How Unit Tests Improve Code Quality and Maintainability

Code that is easy to test usually ends up being easier to maintain. This isn’t theory – it shows up in everyday work. Functions become smaller. Responsibilities are clearer. Weird side effects get cleaned up because they’re hard to test otherwise.

Unit tests also act like a quiet form of documentation. When someone new joins the team, reading tests often explain behavior faster than reading the implementation. You can see what inputs matter and what outcomes are expected without guessing.

Over time, tests give teams confidence to refactor. Instead of avoiding changes because something might break, developers can make improvements and rely on tests to catch mistakes. That confidence is what keeps systems from slowly decaying.

Good unit tests don’t make software perfect. They just make change safer, and that matters more in the long run.

Unit Testing Tools and Frameworks for Popular Languages

Most teams don’t struggle because of missing tools. They struggle because of inconsistent usage. JavaScript teams often use Jest because it’s simple and works out of the box. Python teams lean toward pytest because it’s flexible and readable. Java projects still rely heavily on JUnit, usually paired with mocking libraries when needed.

These tools aren’t magic. They just make writing and running tests easier. What actually matters is how teams use them. If tests are slow, flaky, or ignored, the framework won’t help. If tests run automatically in CI and fail builds when something breaks, people pay attention.

The best setups are boring. Same framework, same structure, same expectations across the codebase. When testing feels routine instead of special, it actually sticks.

See Additional Guides on Key Software Development Topics

Together with our content partners, we have authored in-depth guides on several other topics that can also be useful as you explore the world of software development.

Environment Variables

Authored by Configu

• Leveraging Environment Variables in Python Programming
• Environment Variables: How to Use Them and 4 Critical Best Practices 
• 4 Ways to Set Docker Compose Environment Variables 

Code Documentation

Authored by Swimm

• Agile Documentation: Benefits and Best Practices
• Documentation as Code: Why You Need It & How to Get Started
• The Importance of Continuous Integration Documentation

Technical Documentation

Authored by Swimm

• What is Technical Documentation and How to Create it? 
• Get started with technical documentation writing best practices 
• Essential Resources for Technical Documentation Templates 

Table of Content

1. What Is Mobile Security? 
2. Common Mobile Security Threats 
3. 6 Ways to Improve Mobile Security 
4. Implementing Mobile Security in the Enterprise: Tips and Best Practices 

What Is Mobile Security? 

Mobile security is a broad term that encompasses all the measures and technologies used to safeguard both personal and business information stored on and transmitted from our mobile devices.

Mobile security can be broken down into three key areas: 

• Physical security: Protecting the device itself from theft or damage. 
• Software security: Protecting the data on the device, often through the use of password protection and encryption. 
• Network security: Safeguarding data as it is transmitted to and from the device, usually through secure network protocols and firewalls.

Mobile security is critical for both organizations and end users. With so much personal and sensitive data stored on our devices – from our banking details to our emails – it’s crucial that we take steps to protect it. And as the number of mobile devices continues to soar, so too does the risk of mobile security threats.

This is part of a series of articles about web application security

In this article:

• Common Mobile Security Threats
  • Malware and Spyware
  • Phishing and Social Engineering
  • Unsecured Wi-Fi Networks
  • Physical Theft or Loss of Device
• 6 Ways to Improve Mobile Security
  • 1. Encryption
  • 2. Two-Factor Authentication (2FA)
  • 3. Virtual Private Networks (VPNs)
  • 4. Biometric Security Features
  • 5. Mobile Device Management (MDM)
  • 6. Secure Coding Practices for Mobile Applications
• Implementing Mobile Security in the Enterprise: Tips and Best Practices
  • Use Built-In Security Features on Devices
  • Secure Wi-Fi and Bluetooth
  • Install Reliable Security Software
  • Data Backup
  • Regular Updates
  • Security Testing for Mobile Applications

Common Mobile Security Threats 

Malware and Spyware

Malware is malicious software designed to cause harm to a device or network, while spyware is software that secretly monitors and gathers information.

Malware can take many forms, including viruses, worms, and ransomware. It can be downloaded unknowingly from untrustworthy apps or websites, or delivered via malicious email attachments. Once on your device, malware can steal personal information, damage software, and even take control of your device.

Spyware, on the other hand, is typically installed without the user’s knowledge and is used to track and record activity. This can include keystrokes, browsing history, and even phone calls and text messages. The information collected can then be used for everything from identity theft to corporate espionage.

Phishing and Social Engineering

Phishing and social engineering are another common threat to mobile security. These tactics involve tricking individuals into revealing sensitive information, such as passwords or credit card numbers.

Phishing typically involves deceptive emails or messages that appear to be from a trustworthy source, such as your bank or a popular website. These messages often contain a link to a fake website where you are asked to input your personal information.

Social engineering involves manipulating individuals into performing actions or divulging confidential information. This might involve a phone call from someone claiming to be from your bank, a text message from a ‘friend’ asking for a password, or even a stranger asking to borrow your phone to make a call.

Related content: Read our guide to web application security testing.

Unsecured Wi-Fi Networks

Unsecured Wi-Fi networks are another significant threat to mobile security. When you connect to a public Wi-Fi network – at a coffee shop, for example – you potentially expose your device to anyone else on that network.

Without proper security measures in place, an attacker on the same network can intercept your data, including passwords and credit card numbers. They may also be able to access your device directly, giving them the ability to view and even alter your data.

Physical Theft or Loss of Device

The physical theft or loss of a device is something many of us don’t think about until it’s too late. Yet it represents one of the most significant threats to mobile security.

If your device falls into the wrong hands, everything on it – from your contacts to your photos to your banking information – is at risk. Furthermore, if your device is not properly secured, an attacker may be able to gain access to your online accounts, or even your personal or business network.

Learn more in our detailed guide to mobile security threats (coming soon)

6 Ways to Improve Mobile Security 

Here are several techniques that can help protect mobile devices and the data they hold from potential security threats.

1. Encryption

Encryption forms the backbone of mobile security. It involves converting data into an unreadable format, which can only be converted back to its original form with the correct decryption key. With encryption, even if an unauthorized person gets a hold of your data, it would be of no value to them due to its unreadable nature.

There are different types of encryption, including data-at-rest encryption and data-in-transit encryption. Data-at-rest encryption protects your stored data on a mobile device. On the other hand, data-in-transit encryption safeguards your data while it is being transferred over networks. Both are equally important and help maintain the integrity and confidentiality of your data.

2. Two-Factor Authentication (2FA)

Two-factor authentication (2FA) is a security measure that requires two types of identification before allowing access to your data. The first factor is usually something you know, like a password or a pin. The second factor could be something you have, such as a mobile device or a smart card, or something you are – a biometric feature like a fingerprint or face recognition.

2FA provides an extra layer of security, making it harder for potential intruders to gain access to your data. Even if someone cracks your password, they would still need the second factor to access your data.

3. Virtual Private Networks (VPNs)

Virtual Private Networks (VPNs) are another important mobile security technology. A VPN creates a secure, encrypted tunnel between your device and the server, ensuring that all data passing through this tunnel is private and secure from potential eavesdroppers.

VPNs are particularly useful when using public Wi-Fi, which is known to be insecure and a breeding ground for cybercriminals. With a VPN, you can safely use public Wi-Fi without worrying about your data being intercepted.

4. Biometric Security Features

Biometric security features have become a standard part of mobile security. They use unique physical or behavioral characteristics, such as fingerprints, facial recognition, or voice recognition, to authenticate users.

Biometric features offer a higher level of security compared to traditional passwords or pins. They are unique to each individual and can’t be easily replicated, making them a robust security measure.

However, biometric features are not foolproof. They can be potentially tricked with fake fingerprints or photos. Therefore, it’s recommended to use them in conjunction with other security measures like encryption or 2FA.

5. Mobile Device Management (MDM)

Mobile Device Management (MDM) is a technology that allows IT administrators to control, secure and enforce policies on mobile devices like smartphones, tablets, and laptops.

MDM is particularly useful in an enterprise setting, where employees use their mobile devices to access sensitive business data. With MDM, IT administrators can remotely wipe data from lost or stolen devices, enforce strong passwords, and manage app permissions.

6. Secure Coding Practices for Mobile Applications

Mobile applications are a potential entry point for many security threats. Hence, it’s essential to follow secure coding practices while developing these applications.

Secure coding involves writing code that is free from vulnerabilities and can withstand potential attacks. It includes practices like input validation, error handling, and secure session management.

While secure coding can significantly reduce the risk of security threats, it’s equally important to conduct regular security testing and patching to uncover and fix any potential vulnerabilities.

Implementing Mobile Security in the Enterprise: Tips and Best Practices 

Implementing mobile security in an enterprise setting requires a strategic approach. Here are a few important best practices:

Use Built-In Security Features on Devices

Most modern mobile devices come with built-in security features. These features include encryption, biometric authentication, secure boot, and more.

Using these built-in security features is a simple and effective way to enhance mobile security. However, these features are often not enabled by default, and users need to manually activate them. Solutions like MDM can help automatically enforce security features on user devices.

Secure Wi-Fi and Bluetooth

Wi-Fi and Bluetooth are common attack vectors for cybercriminals. Hence, it’s essential to secure them.

For Wi-Fi, use VPNs when connecting to public networks. For Bluetooth, turn it off when not in use and only pair with known devices. Remember, an open Bluetooth connection is an open invitation to hackers.

Install Reliable Security Software

Security software acts as the first line of defense against potential threats. It includes antivirus, anti-malware, and firewall applications.

Choose reliable security software from a trusted provider. Regularly update the software to ensure it can protect against the latest threats.

Data Backup

Regularly backing up data is a fundamental practice in mobile security. It ensures that even in the event of a data loss, you can quickly restore your data.

Use automatic backup features available on most mobile devices. Store backups in a secure location, either locally or on a cloud service.

Regular Updates

Regular updates are crucial for maintaining mobile security. Updates often include security patches that fix vulnerabilities and enhance the overall security of the device.

Enable automatic updates on all devices to ensure you always have the latest security patches.

Security Testing for Mobile Applications

Security testing is a vital aspect of mobile security, ensuring that applications are free from vulnerabilities that could be exploited by hackers. Several automated tools can help verify the security of mobile applications:

• Software Composition Analysis (SCA) reviews open-source components in the app to identify known vulnerabilities.
• Static Application Security Testing (SAST) inspects the application’s source code to pinpoint potential security issues. This is a proactive measure taken to prevent vulnerabilities in the early stages of development.
• Dynamic Application Security Testing (DAST) tests the application in its running state, detecting issues that only arise during operation.
• Penetration testing mimics real-world hacking attempts to identify possible security flaws within the application.

Regular security testing should be integrated into the app’s development lifecycle, with vulnerabilities patched immediately and re-tested post-patching to ensure the fixes are effective. This continuous testing enhances the security of the application, fostering user trust and protecting enterprise reputation.

Learn more in our detailed guide to security testing tools 

Learn more about Bright Security

Table of Content

1. What Is API Security?
2. Common API Security Risks and Attacks
3. Stay Current with Security Risks
4. Encrypt Your Data
5. Identify API Vulnerabilities 
6. Eliminate Confidential Information 
7. Apply Rate Limits
8. Validate API Inputs
9. Use an API Security Gateway
10. Build Threat Models
11. Use API Firewalls
12. Use OAuth and OpenID Connect
13. Test Your APIs with Dynamic Application Security Testing (DAST)
14. API Testing with Bright Security

What Is API Security?

API security is the use of any security practice relating to application programming interfaces (APIs), which are common in modern applications. API security involves managing API privacy and access control and the identification and remediation of attacks on APIs. These attacks exploit API vulnerabilities or reverse engineer APIs. 

APIs help developers to build client-side applications, which target employees, partners, consumers and the like. The client-side of an application (such as a web application or a mobile application) interacts with the server-side via an API. APIs are also central to microservices architectures.

APIs are typically available through public networks (accessed via any location), making them easily accessible to attackers, and they are well-documented, making them simple to reverse-engineer. This makes APIs a natural target for cybercriminals, and they are especially sensitive to Denial of Service (DoS) attacks. 

A cyber attack commonly involves side-stepping the client-side application in an effort to disrupt the workings of an application for other users or to obtain private data. API security focuses on securing this application layer and attending to what may happen if a cybercriminal were to interact directly with the API.

In this article you will learn about the following API security best practices:

Common API Security Risks and Attacks
1. Stay Current with Security Risks
2. Encrypt Your Data
3. Identify API Vulnerabilities
4. Eliminate Confidential Information
5. Apply Rate Limits
6. Validate API Inputs
7. Apply an API Security Gateway
8. Build Threat Models
9. Use API Firewalls
10. Use OAuth and OpenID Connect
11. Automate API Security Testing with Bright

Common API Security Risks and Attacks

Understanding the common API security risks and attacks is the first step towards implementing API security best practices. Let’s discuss some of these threats in detail.

Injection Attacks

An injection attack occurs when an attacker sends malicious data to an API, tricking it into executing unintended commands. For example, an attacker might send a SQL query that deletes data from a database as part of an API request. Injection attacks can result in data breaches, data loss, or even complete system takeover.

Broken Authentication

Broken authentication attacks happen when an attacker is able to impersonate a legitimate user by exploiting weaknesses in the API’s authentication mechanism. This could involve stealing user credentials, session tokens, or exploiting vulnerabilities in the authentication protocol itself. Once inside, the attacker can perform any action the impersonated user is authorized to do.

Insecure Direct Object References (IDOR)

Insecure Direct Object References (IDOR) occur when an API exposes direct references to internal resources. An attacker can manipulate these references to gain unauthorized access to data. For example, if an API uses sequential numbers as identifiers for user profiles, an attacker might guess the number of another user’s profile to access their data.

Exposure of Sensitive Information

Exposure of sensitive information is a common API security risk. It occurs when an API unnecessarily reveals sensitive information, like user passwords or credit card numbers, in its responses. This can happen due to poor coding practices or lack of proper data sanitization procedures.

Lack of Rate Limiting

Rate limiting is a technique used to control the number of requests a client can send to an API in a certain period. If an API lacks proper rate limiting, it may be susceptible to DoS (Denial of Service) attacks or brute-force attacks.

Misconfigured CORS (Cross-Origin Resource Sharing)

Cross-Origin Resource Sharing (CORS) is a mechanism that allows many resources (e.g., fonts, JavaScript, etc.) on a web page to be requested from another domain outside the domain from which the resource originated. Misconfigured CORS can allow unauthorized domains to make requests, potentially leading to data breaches.

API Versioning

API versioning refers to the practice of having multiple versions of an API to accommodate changes in its structure or functionality over time. If not managed properly, API versioning can lead to security risks. For instance, deprecated versions of the API might still be accessible and lack the security enhancements of newer versions.

Now that we have reviewed some of the most common security threats, let’s dive into best practices that can help you improve API security.

1. Stay Current with Security Risks

One of the most critical aspects of API security is staying informed about the latest threats and vulnerabilities. This includes regularly consulting resources such as OWASP (Open Web Application Security Project) API Security Top Ten, security blogs, and industry news. Additionally, it’s essential to participate in security forums and mailing lists to stay informed about the latest trends and best practices in the field of API security.

It is also important to ensure that your software and APIs are always up-to-date. This includes applying security patches, updating libraries, and upgrading to the latest version of the platforms you are using. Outdated software is more vulnerable to attacks, so it’s crucial to keep everything current to minimize the risk of a security breach.

Having a well-defined security policy is vital to ensure that all team members are aware of the best practices and guidelines for API security. This policy should cover various aspects such as authentication, authorization, data protection, and monitoring. Additionally, it should be regularly reviewed and updated to reflect the latest security trends and best practices.

Related content: Read our guide to API security testing

2. Encrypt Your Data

Encrypting your data is one of the most critical steps in ensuring API security. One way to do this is by using HTTPS (Hypertext Transfer Protocol Secure) and TLS (Transport Layer Security) to secure the communication between client and server. HTTPS and TLS help protect sensitive information from being intercepted, modified, or stolen by attackers.

It is also essential to protect data at rest. This includes encrypting data stored in databases, file systems, or other storage systems. Various encryption techniques can be used, such as transparent data encryption, column-level encryption, or file-level encryption. By encrypting data at rest, you can prevent unauthorized access and data breaches in case your storage systems are compromised.

When using encryption, it’s crucial to have a robust key management strategy in place. This includes generating, storing, and managing encryption keys securely. Ensure that encryption keys are stored separately from the encrypted data and access to the keys is restricted to authorized personnel only. Additionally, you should regularly rotate encryption keys to minimize the risk of compromise.

3. Identify API Vulnerabilities 

To identify vulnerabilities in your APIs, it’s essential to perform regular security audits. These audits should include a thorough examination of your API architecture, design, and implementation. Ensure that you check for common vulnerabilities such as injection flaws, broken authentication, and insecure data storage. Regular security audits help you identify potential weaknesses in your APIs and address them before they can be exploited by attackers.

Continuous monitoring is another essential aspect of identifying API vulnerabilities. This includes monitoring your APIs for unusual activity, performance issues, and potential security threats. By implementing continuous monitoring, you can detect and respond to security incidents more quickly and efficiently.

4. Eliminate Confidential Information 

One of the best ways to protect confidential information is to avoid storing sensitive data in your APIs altogether. This includes data such as passwords, access tokens, and API keys. Instead, use secure methods like token-based authentication and OAuth to grant access to your APIs.

If you must store sensitive data, it’s essential to use data masking techniques to obfuscate the information. Data masking can help protect sensitive information by replacing it with random or fictitious data, making it harder for attackers to gain access to the actual data. This is particularly useful when dealing with personally identifiable information (PII) or other sensitive information that should not be exposed.

Another aspect of eliminating confidential information is implementing proper access controls. This includes using role-based access control (RBAC) or attribute-based access control (ABAC) to restrict access to sensitive data and API endpoints. By limiting access to the data and functionality of your APIs, you can prevent unauthorized access and protect sensitive information from being exposed.

5. Apply Rate Limits

Rate limiting helps prevent API abuse and denial of service (DoS) attacks. By limiting the number of requests that can be made to your API within a specific time frame, you can ensure that your APIs remain available for legitimate users while preventing attackers from overwhelming your system with a flood of requests.

In addition to rate limiting, you can also implement API quotas to restrict the number of requests that can be made by a single user, application, or IP address. This can help protect your APIs from abuse and ensure that your resources are allocated fairly among your users.

Adaptive rate limiting is a more advanced technique that involves dynamically adjusting the rate limits based on factors such as user behavior, traffic patterns, and resource usage. This can help you provide a better user experience while still protecting your APIs from potential threats.

6. Validate API Inputs

To ensure the security of your APIs, it’s essential to validate all input data before processing it. This includes checking for data types, lengths, formats, and allowed values. By validating input data, you can prevent various security vulnerabilities such as injection attacks and buffer overflows.

Another crucial aspect of checking API parameters is sanitizing output data. This includes removing any potentially harmful content, such as HTML, JavaScript, or SQL code, from the data returned by your APIs. By sanitizing output data, you can protect your users and applications from potential cross-site scripting (XSS) and other code injection attacks.

When working with databases, it’s essential to use parameterized queries and prepared statements to prevent SQL injection attacks. By using these techniques, you can ensure that user input is treated as data rather than executable code, making it more difficult for attackers to inject malicious SQL code into your queries.

7. Use an API Security Gateway

An API security gateway is a specialized software or hardware solution that helps protect your APIs from external threats. By acting as a proxy between your API and the client, an API security gateway can enforce security policies, authenticate and authorize users, and monitor API traffic for potential threats.

By implementing security features at the gateway level, you can offload some of the security responsibilities from your API, making it more scalable and easier to manage. Some common security features provided by API security gateways include authentication, authorization, rate limiting, and encryption.

API security gateways can also help you monitor and log API traffic, allowing you to analyze patterns and detect potential security incidents. By collecting and analyzing logs, you can gain insights into your API usage, identify potential security issues, and improve the overall security of your APIs.

8. Build Threat Models

Threat modeling is a process used to identify potential threats and vulnerabilities in your APIs. By understanding the possible risks and attack vectors, you can develop appropriate countermeasures and security controls to protect your APIs.

To build effective threat models, it’s essential to analyze the various components of your APIs, such as endpoints, data stores, and communication channels. Additionally, you should examine the data flows between these components to understand how data is processed, stored, and transmitted.

Based on the identified threats and vulnerabilities, you can develop appropriate security controls and countermeasures to mitigate the risks. These controls may include encryption, access controls, input validation, and monitoring. By implementing these security measures, you can help protect your APIs from potential attacks and breaches.

9. Use API Firewalls

API firewalls are specialized security solutions that help protect your APIs from malicious traffic. By filtering incoming requests based on predefined rules and policies, API firewalls can block potential attacks and prevent unauthorized access to your APIs.

Using access control lists (ACLs), you can define the rules and policies that determine which clients are allowed to access your APIs. This can help you restrict access to specific IP addresses, users, or applications, ensuring that only legitimate users can access your APIs.

API firewalls can also help you monitor and analyze API traffic, allowing you to detect potential security incidents and respond more quickly. By collecting and analyzing logs, you can gain insights into your API usage, identify potential security issues, and improve the overall security of your APIs.

10. Use OAuth and OpenID Connect

OAuth and OpenID Connect are widely used standards for securing authentication and authorization in APIs. OAuth provides a secure way for clients to access protected resources on behalf of users, while OpenID Connect enables user authentication and single sign-on (SSO) across multiple applications.

By using token-based authentication, you can ensure that your APIs are protected from unauthorized access. OAuth and OpenID Connect use access tokens and ID tokens, respectively, to grant access to your APIs. These tokens are short-lived and can be revoked or refreshed as needed, providing a more secure alternative to traditional username/password authentication.

OAuth and OpenID Connect allow you to leverage existing identity providers (IdPs) such as Google, Facebook, or Azure Active Directory for authentication and authorization. By using these services, you can offload the management of user accounts and credentials, making it easier to maintain and secure your APIs.

11. Test Your APIs with Dynamic Application Security Testing (DAST)

Dynamic Application Security Testing (DAST) is a technique used to identify security vulnerabilities in running applications. By interacting with your APIs and analyzing the responses, DAST tools can help you detect potential issues such as broken authentication, insecure data storage, and cross-site scripting (XSS) attacks.

By integrating DAST into your development and deployment pipelines, you can automate security testing and ensure that your APIs are continuously monitored for potential vulnerabilities. This can help you catch security issues early on and save time and resources by fixing them before deployment.

API Testing with Bright Security

Bright has been built from the ground up with a dev first approach to test your web applications, with a specific focus on API security testing tools.

With support for a wide range of API architectures, test your legacy and modern applications, including REST API, SOAP, and GraphQL testing.

Bright complements DevOps and CI/CD processes, empowering developers to detect and fix vulnerabilities on every build. It reduces the reliance on manual testing by leveraging multiple discovery methods:

• HAR files
• OpenAPI (Swagger) files 
• Postman Collections

Start detecting the technical OWASP API Top 10 and more, seamlessly integrated across your pipelines via:

• Bright Rest API
• Convenient CLI for developers
• Common DevOps tools like CircleCI, Jenkins, JIRA, GitHub, Azure DevOps, and more

Learn more about Bright

Table of Content

1. Introduction
2. Rapid Scanning: A Preliminary Line of Defense
3. Intensive Examination: The Deep-Dive Approach
4. How to choose the best approach
5. Summary

Introduction

Dynamic Application Security Testing (DAST) is a crucial component in fortifying web applications against potential vulnerabilities. By taking a proactive stance, DAST systematically detects and addresses security flaws. Employing a black-box testing methodology, it scrutinizes the application from an external perspective, focusing on exposed interfaces without relying on internal source code knowledge. Through simulated cyberattacks, DAST diligently monitors application responses, exposing exploitable vulnerabilities like Cross-Site Scripting (XSS), SQL Injection, and Security Misconfigurations. The scanning process encompasses two distinct categories: rapid (or shallow) scans and intensive (or in-depth) scans. By delving into these approaches, we gain a comprehensive understanding of their unique attributes, advantages, and limitations.

Rapid Scanning: A Preliminary Line of Defense

Rapid scans, sometimes referred to as lightweight or shallow scans, provide a quick yet effective assessment of an application’s security posture. These scans work by rapidly crawling the application and testing for common, surface-level vulnerabilities. They are typically employed during the initial phases of the Software Development Life Cycle (SDLC) or as part of continuous integration/continuous deployment (CI/CD) in DevSecOps environments.

Rapid scans offer notable advantages in terms of speed and efficiency. Their swiftness enables a prompt security feedback loop, facilitating quick remediation and reducing the likelihood of vulnerabilities making it into production. Furthermore, their non-intrusive nature ensures minimal impact on system performance, making them well-suited for regular and frequent testing in agile development contexts.

However, it is important to recognize the limitations of rapid scans. Due to their focus on speed, they may provide a less exhaustive assessment, potentially overlooking complex, nested, or multi-step vulnerabilities that require a deeper understanding of the application’s behavior. Moreover, rapid scans may not comprehensively test all potential attack vectors, as they often prioritize higher-level, easily accessible interfaces.

To achieve a comprehensive security posture, it is crucial to supplement rapid scans with intensive scans. By combining the two approaches, organizations can leverage the efficiency of rapid scans while addressing the shortcomings through in-depth assessments. This balanced approach ensures that both the speed and thoroughness required for robust security are achieved.

Intensive Examination: The Deep-Dive Approach

Intensive scans, also known as deep or exhaustive scans, offer a far more thorough and comprehensive exploration of an application’s security landscape. This methodology involves an in-depth assessment of the application, probing parameters, analyzing responses, and validating potential vulnerabilities in detail. Techniques employed in this method often include advanced fuzzing, path traversal checks and analysis of business logic vulnerabilities.

The primary advantage of intensive scans is their thoroughness. They are capable of uncovering complex, multi-step vulnerabilities that rapid scans may miss, providing a detailed and comprehensive view of the application’s security standing. As a result, intensive scans are particularly beneficial for applications with high-security requirements, complex architectures, or those processing sensitive data.

Nonetheless, the exhaustive nature of intensive scans presents its own challenges. These scans are time and resource-intensive, often less feasible in fast-paced, agile environments. Their thoroughness can also lead to an increased number of false positives, requiring additional resources to analyze and validate the results. Furthermore, their invasive nature may disrupt regular operations or cause performance degradation, making them less suited for live or performance-sensitive systems.

How to choose the best approach

In the landscape of application security testing, both rapid and intensive scans serve indispensable roles. The decision between them should hinge upon a careful consideration of several factors including risk profile, development pace, resource availability, and the complexity of the application.

Rapid scans serve as a valuable preliminary measure, swiftly identifying and resolving common vulnerabilities during the early development stages. On the other hand, intensive scans deliver a comprehensive security audit, offering an invaluable layer of assurance for high-risk applications or prior to deployment.

A balanced and effective security strategy often leverages both approaches. Employing rapid scans early and often, followed by intensive scans at strategic points, can provide a layered and robust defense, delivering both speed and depth in your application security testing protocol.

The frequency and timing of these scans should align with the rhythm of your development cycle and the specific characteristics of your application. For instance, after the integration of new features or significant code changes, a rapid scan can provide immediate feedback to developers. This early detection reduces remediation costs and time, and prevents security debt from accumulating in the codebase.

Following the rapid scan, intensive scans can be scheduled at key milestones, such as before major version releases or after a significant architectural change. This in-depth scrutiny assures stakeholders that more intricate vulnerabilities have not been overlooked, thereby providing a solid security foundation for the application.

Apart from the scheduled scans, it’s worth noting that an agile DAST strategy should also allow room for unscheduled, trigger-based scans. These can be triggered by events such as the discovery of a new common vulnerability, a significant increase in traffic, or the release of a new version of a third-party component that an application relies on.

While integrating both rapid and intensive scans into your DAST strategy, it’s also important to remember the role of false positive management. With the potential for an increased number of false positives, particularly from intensive scans, the establishment of an efficient triage process is essential. This will ensure that false positives are quickly identified and disregarded, saving valuable time and resources.

In addition, it is beneficial to foster a strong culture of security awareness within your development team. Training developers to understand and address security issues identified by DAST scans reduces the security feedback loop and strengthens the application’s security posture. This symbiosis between automated scanning and human expertise is a cornerstone of an effective, balanced security strategy.

Summary

In making the decision between rapid and intensive scans, it’s important to recognize that it’s not a simple binary choice. Instead, it requires a thoughtful consideration of specific requirements and constraints. By adopting a stratified approach to DAST scanning, organizations can achieve an optimal balance between immediacy and thoroughness.

Leveraging rapid scans offers the advantage of swift identification of potential vulnerabilities, providing immediate insights into critical security issues. On the other hand, intensive scans delve deeper into the application, meticulously examining every nook and cranny to uncover even the most intricate vulnerabilities. The combination of these approaches enables organizations to build a comprehensive security framework.

By employing rapid scans for timely responsiveness and intensive scans for meticulous scrutiny, organizations can strike the right equilibrium between speed and depth. This approach ensures the establishment of a robust and comprehensive security posture, safeguarding web applications against a wide range of potential threats.

Table of Content

1. What Is Web Application Scanning? 
2. 4 Reasons You Need Web Application Security Scanning 
3. Web Application Scanning vs. Web Vulnerability Scanning
4. Types of Web Application Scanning Tools 
5. How to Choose Web Application Scanning Tools 
6. Security Testing with Bright Security

What Is Web Application Scanning? 

Web application scanning involves systematically testing a web application for potential security vulnerabilities. The goal of web application scanning is to identify security weaknesses before they can be exploited by attackers. 

This is typically accomplished by using automated tools to scan the application for known vulnerabilities, such as SQL injection or cross-site scripting (XSS). Some tools can also attempt to identify vulnerabilities that are not well-known or documented. 

Web application scanning is an important part of an organization’s overall security posture, as it can help identify and prioritize vulnerabilities that need to be addressed to reduce the risk of a successful attack.

This is part of a series of articles about security testing

In this article:

• The Importance of Web Application Security Scanning
• Web Vulnerability Scanning vs. Web Application Scanning
• How to Choose Web Application Scanning Tools

4 Reasons You Need Web Application Security Scanning 

Web application scanning has several advantages, including:

1. Detecting and fixing security vulnerabilities early: By scanning a web application for vulnerabilities, organizations can identify and address security issues before they can be exploited by attackers. This can help prevent data breaches and other security incidents.
2. Producing detailed website health reports: Web application scanning can provide detailed reports on the health and security of a website. This information can help organizations better understand their website’s vulnerabilities and take steps to address them.
3. Ensuring compliance: Many industries have regulatory requirements for website security. Scanning can help organizations ensure that their website meets these compliance standards.
4. Maintaining uptime: Security vulnerabilities can lead to website downtime, which can result in lost revenue and damage to an organization’s reputation. By identifying and addressing vulnerabilities early, web application scanning can help maintain website uptime and availability.

Learn more in our detailed guide to web application security 

Web Application Scanning vs. Web Vulnerability Scanning

Web vulnerability scanning and web application vulnerability are two related approaches to web application security testing.

Web application scanning involves evaluating web applications for security vulnerabilities and threats, but with a focus on the application layer. It involves using automated tools to scan web applications for potential security flaws, such as input validation errors, authentication and authorization issues, session management vulnerabilities, and other application-level vulnerabilities – including web vulnerability scanning, as defined below.

Web vulnerability scanning refers to the process of automatically scanning a website or web application to detect known security vulnerabilities such as SQL injection, cross-site scripting, and other vulnerabilities that could be exploited by attackers. This process usually involves crawling the website or application, submitting various inputs and requests, and analyzing the responses to detect potential vulnerabilities.

Learn more in our detailed guide to microservices security.

Types of Web Application Scanning Tools 

There are three main types of web application scanning tools:

• Static Application Security Testing (SAST) tools check the source code of web applications to identify potential security vulnerabilities. This type of tool can detect issues such as cross-site scripting (XSS), SQL injection, and buffer overflows.
• Dynamic Application Security Testing (DAST) tools test web applications while they are running to identify vulnerabilities that cannot be detected through static analysis. These tools simulate real-world attacks to identify weaknesses in the application’s security posture.
• Software Composition Analysis (SCA) tools focus on identifying vulnerabilities in third-party components that are used in web applications. SCA tools examine the software dependencies of web applications to identify known vulnerabilities in the third-party components.

How to Choose Web Application Scanning Tools 

Choosing the right web application scanning tool is an important decision for organizations looking to improve their website security. While web application scanning can be an effective way to identify vulnerabilities in a website, traditional scanners have some limitations. These limitations include:

• Incomplete coverage: Traditional scanners may not detect all vulnerabilities, especially those that are more complex or require manual testing. It is important to choose a tool that provides adequate coverage for the organization’s website and the types of vulnerabilities that are most relevant to their business.
• Time-consuming scans: They can take a long time to complete, which can be a significant burden on resources and may cause delays in addressing vulnerabilities.
• False positives: They may generate many false positives, which can be time-consuming to review and can lead to frustration and wasted resources. The accuracy of a scanning tool is another important factor to consider. False positives can waste time and resources, so it is important to choose a tool that minimizes false positives and provides accurate results.

To choose the right web application scanner and make the most of it, there are some recommended practices that organizations should follow:

• Choose a tool with integrations: Integration with other security and vulnerability management tools is also important. A tool that integrates well with other tools can help streamline the vulnerability management process and provide more comprehensive coverage.
• Calculate costs in advance: Cost is also an important consideration when choosing a web app scanning tool. Some tools may be expensive, while others may be more affordable. It is important to choose a tool that provides good value for the organization’s budget. 
• Implement continuous discovery: Web application scanning should be an ongoing process, not a one-time event. Implementing continuous discovery can help ensure that new vulnerabilities are identified as soon as they are introduced.
• Implement continuous testing: Similarly, testing should be an ongoing process. Regular testing can help ensure that vulnerabilities are being addressed and that the website remains secure over time.
• Expand the scope of vulnerability scans: Traditional scanners may not detect all vulnerabilities, so it is important to increase the scope of vulnerability scans by incorporating manual testing and other tools.
• Integrate security and vulnerability management into the CI/CD pipeline: Organizations can ensure that security is built into the development process from the beginning. This can help prevent vulnerabilities from being introduced in the first place and can help ensure that vulnerabilities are addressed quickly and efficiently.

Learn more in our detailed guide to security testing tools 

Security Testing with Bright Security

Bright Security helps address the shortage of security personnel, enabling AppSec teams to provide governance for security testing, and enabling every developer to run their own security tests. 

Bright empowers developers to incorporate an automated Dynamic Application Security Testing (DAST) solution into their unit testing process so they can resolve security concerns as part of their agile development process. Bright’s DAST platform integrates into the SDLC fully and seamlessly: 

• Test results are provided to the CISO and the security team, providing complete visibility into vulnerabilities found and remediated
• Tickets are automatically opened for developers in their bug tracking system so they can be fixed quickly

Bright Security can scan any target, whether Web Apps, APIs (REST/SOAP/GraphQL) to help enhance DevSecOps and achieve regulatory compliance with our real-time, false positive free actionable reports of vulnerabilities. In addition, our ML-based DAST solution provides an Automated solution to identify Business Logic Vulnerabilities.

Learn more about Bright Security testing solutions