How To Write Test Cases : Examples With Best Practices.

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  • How To Write Test Cases : Examples With Best Practices.

OVERVIEW

A test case is the set of criteria required to validate a specific feature or functionality. It outlines the processes, test data, prerequisites, and postconditions needed to verify a software application's functionality.

The main objective of the Software Testing Life Cycle (STLC) is to identify and report any errors or issues in software applications at the earliest. Among its several phases, test case development is a crucial step. It involves writing correct cases to run tests.

In other words, the testing case is a critical component of STLC, which ensures the reliability and functionality of the software application. We can define it as the detailed description of required steps and expected results for specific test scenarios.

Writing effective test cases helps in ensuring the functionality of software applications. It verifies whether the software meets the Software Requirement Specification (SRS). However, it is required to understand the function of software applications to be tested to write effective test cases. Additionally, you should be able to think critically and creatively to identify errors in software applications.

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What is a Test Case?

Test cases are specific steps in software testing to verify features, including data, prerequisites, and postconditions for verification.

A test case serves as a predefined set of conditions or activities designed to validate the functionality of a software program or system. It encompasses a comprehensive description of the inputs, preconditions, steps to be executed, and expected outcomes. Test cases are meticulously written to target specific aspects or functionalities of the software, ensuring that they align with the established requirements and meet the desired objectives.

The primary purpose of running test cases is to identify any defects or issues in the application so that they can be fixed before the application is released to the end users.

Here are some key points that will give you a good understanding of test cases:

  • Manual and Automated Test Case Creation: You can create testing cases manually or by automated approach.
  • Manual Test Case Creation and Execution: The tester creates manual testing cases and follows the steps outlined to verify the application’s functionality.
  • Automated Test Case Execution with Test Tools: Using test tools and frameworks, automated testing cases are executed, which follow Software Requirement Specification (SRS).
  • Structured Approach to Functionality Verification: It provides a structured approach to verify the functionality of software applications.
  • Independence of Test Cases: They are not dependent on each other, meaning that the result of one test case should not impact the result of another.
  • Controlled Execution Environment for Test Cases: You can execute the test case in a controlled environment, ensuring the availability of all necessary resources without impacting the software production environment.

What is Test Scenario?

A test scenario is a particular setting or condition used to assess the functionality of software or a system. It is a specified set of actions and inputs that are carried out in order to test a certain component or function of the programme. To guarantee that the programme functions as intended under varying settings, test scenarios are built based on requirements and specifications. They outline the inputs, actions, and anticipated results to be tested, allowing testers to determine whether the programme is functioning properly.

Why are Test Cases important?

When you plan to test an application, you should know the appropriate time for the release of the software application or mark it as “complete” for the developed features or task. You would have witnessed a situation where you are unsure whether testing has covered all functionality of software applications expected by end users.

This could be time-consuming. To avoid such situations, testing cases are created in advance. It covers all the positive and negative test scenarios to test a software application.

When you have developed test cases in advance, there will be a clear direction for the software testing and its expected result to achieve. In other words, testing cases provide steps and input data values to run a test. Further, you can share the planned testing cases with the end user to get feedback or update it if required. Thus, we can say that it brings all the crucial aspects of testing software applications.

Having test cases also ensures continuous testing. You can get an idea of the test conducted for the functionality of the software application when it is required for retesting after any changes are made. Additionally, if you are given any application to test, testing cases will allow you to ensure that the new tester does not miss any test scenarios.

Features of Test Cases

The main aim of testers and developers is to ensure high-quality software applications which are bug-free and meet users’ requirements. To achieve this, testing cases should be written to cover all primary components and functionalities of software applications. Here are some crucial features you should consider while creating them.

  • Include all aspects of the software application: Testing cases are comprehensive and cover all aspects of the software’s reliability, functionality, and usability. In other words, it includes all the possible ways users can interact with the software application while using it.

    They cover all scenarios a user may experience while using an application. For example, suppose you test a web application that allows users to create accounts. In that case, the possible scenario might include creating a new account, creating an account with an invalid email, a weak password, and others.

  • Clear and concise: They are written in a way that is easy to understand, with no technical jargon. This makes it more understandable and allows it to be executed without confusing the testers.
  • Revised and updated: Software requirements change based on end-user preferences and organization priorities. You have to initiate the testing process to ensure its end-to-end functionality. For this, the testing cases require to be modified accordingly. Hence, they will likely be revised and updated.
  • Involve clustering: In a test scenario, written test cases are executed in a particular sequence or group. In such situations, a prerequisite of one testing case applies to other cases in a similar sequence.
  • Repeatable and reproducible: Test cases can be used multiple times to test software applications without modification. You can run the same testing cases multiple times and get similar results. This will ensure that the software testing process is consistent and allows you to detect bugs that might not be detected in a single run.

    Further, you can verify whether the previously identified bug is fixed and ensure new changes do not introduce any new bugs.

  • Include expected outcome: Test cases written include expected outcome and preconditions of testing software application. This means they have set requirements or setup that must be met before the testing process and expected results after the completion of software testing.

    When you consider the preconditions and expected outcomes of the testing case, you will ensure that the software testing is consistent and structured in a test environment.

  • Can be automated: You can automate testing cases to make testing efficient and consistent. It will help accelerate the testing process and lower human error risk.
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Role of Test Cases in Software Testing Life Cycle

Software testing’s significance is imperative as it helps identify bugs early in an application. The activities involved in testing software applications are gathered into the Software Testing Life Cycle. It reflects a systematic way of planning a test to ensure the application's quality.

Software Testing Life Cycle involves different phases of software testing, which includes-requirement analysis, test planning, test case development, environment setup, test execution, and test cycle closure. Among those phases, creating test cases lies within the test case development phase.

However, its position in the Software Testing Life Cycle varies depending on the method used. For example, in the test planning phase of the Software Testing Life Cycle, the testing team analyzes the requirements of the testing process. Based on this, the testing case will be developed, including the testing approach, scope, test types, and test objectives.

The written test case is executed in the test execution phase after setting up the test environment. Further, it is then re-executed during retesting of the software application. The outcome of the test case is reported, and its final test report is generated during the test closure phase.

Function of Test Cases

Test cases specify the expected outcome and functionality or features that a tester verifies. It helps determine whether a software application or its features works as expected. We can say that testing cases in software testing are written and executed to determine whether the developed software application is ready for release or not.

Here are some of their essential functions:

  • Evaluate the performance of the expected features and functions of software applications.
  • When you run a testing case, it is easy to detect bugs or errors in software applications. Later, such an issue can be shared with the development team to resolve.
  • The use of testing cases helps identify the early error and thus ensures high-quality and bug-free software applications.
  • Testing cases serve as documentation and record the testing process. With this, you can ensure that all components of software applications are thoroughly tested.

There are similar terms that often create confusion among the new testers and developers. You are sometimes unable to understand the need for the test case, test script, and test scenario.

Test Case vs Test Scenario

A test case is a predefined collection of conditions, inputs, and expected results that are used to test a certain feature or capability of a software programme. It outlines the actions that must be taken. A test scenario, on the other hand, is a larger idea that outlines a specific circumstance or environment to be tested. It covers crucial components such as inputs, actions, and expected consequences and spans several test cases. Test scenarios focus on specific capabilities or features, whereas test cases specify how to execute those scenarios.

Type of Test Cases

To understand the purpose of the test case, addressing its different types is important. The importance of testing cases varies depending on the objectives of the testing process and the nature of the software being tested.

Here are some key points on the importance of different testing cases to help you choose the correct one that aligns with your SRS in testing software applications.

  • Functional Test Case

    A functional testing case is used to find whether the function of the application’s interface is in line with its users. In other words, with a functional testing case, you can identify the success or failure of the expected function of the software. It is part of black box testing and is based on the software specifications to be tested. You don’t have to access the application's internal structure to perform the test.

    Functional testing is part of the normal QA process in the Software Development Life Cycle; hence, the QA team writes the functional testing case. They need to be repeated whenever you add any new functionality.

  • User Interface Test Case

    The user interface testing case verifies the visuals and expected function of the Graphical User Interface. It allows us to identify and test link errors, the appearance of the application, and other aspects that users see or interact with. The testing and design teams are involved in writing user interface testing cases.

    Different browsers render user interfaces differently and may cause your application to look different. Therefore, the user interface testing case drives cross browser testing, ensuring the application appears consistent across multiple browsers.

  • Performance Test Case

    Performance testing cases verify the functionality and response time of software applications. For example, it allows testing the application's response time after executing an action. The testing team mainly writes the performance testing cases and often runs automation testing.

    It helps in understanding the performance of software applications in real scenarios. Usually, performance testing cases are written when a performance requirement is received from the product team.

  • Integration Test Case

    Integration testing cases determine how different software application components interact. Its purpose is to ensure effective working between the interfaces of different components. Both the development and testing teams may work together to write integration testing cases.

  • Usability Test Case

    Usability testing cases are the set of actions that determine the specific tasks and test scenarios users ask to perform during usability testing. Its primary purpose is to ensure structured and well-defined usability tests that analyze the usability of the applications.

    These testing cases involve a series of steps the user performs in an application, like navigating through websites or completing a purchase. Hence, you do not need prior knowledge of the application to write usability testing cases.

  • Database Test Case

    Database testing cases are a set of actions written to test the performance, security, and functionality of the database system. You may think that when everything in a software application works fine, what causes so much data consumption?

    Therefore, database testing cases help verify the code written by developers can store and handle data safely. In other words, it ensures the functionality of the database system and that it can handle expected data volume without error or data loss. Often SQL queries are used to develop database testing cases.

  • Security Test Case

    Security testing cases are a set of actions written to protect the data and ensure its security. Its primary focus is identifying weaknesses, vulnerabilities, and security risks in the software application. Additionally, they ensure that software applications can handle or manage attacks from internal and external sources against potential security threats.

    It includes penetration tests and other security-based tests like risk assessment, vulnerability scanning, and threat modeling. Testers and developers write a security test case with good knowledge of the software application's database. Some include testing password complexity requirements and verifying access controls and permissions.

  • User Acceptance Test Case

    User acceptance testing cases (UAT cases) are a set of actions that consider the user’s perspective to validate the software and ensure it is in line with the acceptance criteria. Hence, it is important to include all components of software applications while writing UAT cases.

Test Cases Styles

Different styles of testing cases are used in software testing, which helps to meet the requirements and objectives of the testing process. Here are the three most important styles:

  • Positive Test Cases: Checks for valid input to validate the expected functioning of the software application. Its main purpose is to ensure the software application is bug-free and meets SRS under positive test scenarios.

    Let us consider a test scenario to create a password field that accepts 10-20 characters and includes only letters. Some positive testing cases include the:

    • Password field should accept 10 characters.
    • Password field should accept 20 characters.
    • Password field should accept all letters.
    positive-test-case-for-sign-in
  • Negative Test Cases: Checks for invalid inputs to validate unexpected functioning of software applications. Its main purpose is to ensure that software applications throw errors against invalid inputs or restrict an application from functioning in a certain way.

    Let us take the same test scenario as explained above. Some underlying negative testing cases include the:

    • Password field should not accept 1-9 characters.
    • Password field should not accept 21 characters.
    negative-test-case-for-sign-in-page
  • Destructive test cases: Checks what a software application can handle until it “breaks” and “destructs.” The typical approach for destructive testing cases is load testing and script injections.

    You can get a clear idea of this with the examples below:

    • Giving a heavy load to the application that can cause failure.
    • Attempt to break the web page by fast clicking.
    destructive-test-case

Importance of Writing Good Test Cases

In the Software Development Life Cycle, good test cases cannot be overlooked. It allows you to run a successful test and make software applications bug-free.

Let us dive deep into why we should write good ones. Here are some related points:

  • Easy to maintain: Writing a testing case may take time. If an application is under test, you may not want to spend time updating them. Therefore, a good testing case is important as it can be maintained and repeated.
  • Adaptable: You may not want to update the complete test suite for every new feature to add to the application. You should practice writing non-specific testing cases pertinent to application user interface changes. It will help to save time and lower errors in testing cases.
  • The time saved in writing test cases can be used to identify edge cases to test, which ensures quality software applications and improves end-user experience.

  • Maintain the application's stability: When new features are added to software applications, good testing cases ensure they don’t impact its function. Thus, it eliminates the risk of regression error and makes the application stable and reliable for the end-users.
  • Identify potential errors: A well-written testing case early identifies and removes any bugs in an application. It lowers the risk of high costs due to rework and delays.

How to Write a Test Case?

Test case templates include the relevant information to run a test specific to the requirement. There is a standard format to write testing cases that you can modify. You can also consider it like the checklist to ensure all crucial functionalities of a software application are included.

Below are the essential elements which required to be included while writing test cases:

  • Module: This consists of a feature or module under test.
  • Test Case ID: It is a unique numeric and alphanumeric identifier for the testing case. It is used to group test cases into test suites.
  • Test Name: The name of the individual conducting the test.
  • Pre-conditions: These are the conditions that must be met before the testing case can be executed. These may include setting up test data, configuring the application settings, or ensuring that specific conditions are met.
  • Test Steps: This lists the steps involved in a test.
  • Test Data: It includes information on the dataset(s) to use for the test.
  • Test Priority: Define the priority level of the test (low, medium, or high).
  • Test Scenario: Describes the situations and functionalities needed for testing.
  • Test Environment: Give the name and characteristics of the environment for testing.
  • Expected Result: Describe the expected output of the test.
  • Actual Result: Describe the actual output of the test.
  • Status: It details whether the test has passed or failed.

Note: You can also add information if there are any special conditions to support the above entries or any question related to the actual or expected result. For example, any additional comments about the testing case, such as defects or issues identified during testing.

Following the above testing case format makes it easy to adhere to the standard way to write test cases. It will ensure that no information related to the test is missed. You should always review and maintain the testing cases to include new functionality.

Role of Test Case Templates

A test case template consists of a series of testing cases that need to be tested by the QA team. Each test case template is designed to make it easy to understand all team members. This document outlines the steps, inputs, and expected results. Using a testing case template, one can plan and organize testing efforts, ensuring all necessary testing cases are executed, and defects are identified and tracked.

Following are some testing case templates that can help in your daily testing activities.


Way to Write Test Cases

The process of writing a testing case involves many different steps, each of which is important to ensure the software quality.

Below are the ways to write them:

  • Use a title

    The important part of writing a testing case is using a Title and Test Case ID. When you write the title, it is best practice to include the name of the module under test and identifier. For example, if you are testing an application's login page, you should include “Login Page” as the title of the testing case.

    However, if in case, the tool you use to create a testing case does not include a title, it is advisable to include a unique identifier in the title so that it could be a reference rather than using a long title.

  • Use strong descriptions

    The description must include information related to the test to be conducted. For example, you can add information on the test environment, test data, and test assumptions. It should be written in a readable format that communicates the objectives of the test.

  • Use assumptions and pre-conditions

    Before you write a testing case and execute the test, it is important to meet any expected assumptions and conditions. Pre-conditions should be documented in the testing case, along with any specific instructions on how to set up the test environment.

    In simple terms, details like which page the user should initiate the test, setup requirements, and dependencies on the test environment should be met before testing an application.

  • Clear and concise test steps

    You should write clear and concise test steps. It contains a detailed process on the steps of tests which gives direction for test execution. You should note that it is not important that the person who wrote the testing case may not be the person who runs the test.

    Therefore, the steps should contain the necessary data and information on executing a test. Hence, you should write steps in a way that any person from the QA team can perform them.

  • Use expected results

    The expected results should be included in the testing case. It informs the testers about the possible outcome of the test. It will help you determine if the testing case will pass or fail.

  • Make it reusable

    When you write testing cases, it is always preferred to reuse them to save unnecessary time in testing software applications. Therefore, the testing case should be written in a way that provides long-term value to the software testing.

Test Case Example

Here is an example of a test case to test Yahoo’s login page.

  • Title: Validate Login Functionality on Yahoo.
  • Description: A registered user should login successfully into their Yahoo account.
  • Precondition: The user should already have an account on Yahoo with an email address and password.
  • Assumption: Supported browser is used.
  • Test Steps:
    • Navigate to the official Yahoo website.
    • Enter the email address of the user in the email field.
    • Click on the Next button.
    • Enter the password of the user's Yahoo account.
    • Click Sign In.
  • Expected Result: A page with a Yahoo user’s inbox should load with new messages at the top of the page.

Way to Improve Test Case Efficiency

Testing case efficiency measures the effectiveness of testing cases and their ability to detect bugs in software applications. It is mainly calculated by dividing the number of defects noted by the total number of testing cases. If the testing case efficiency is high, your testing case successfully detects bugs. However, low testing case efficiency shows that testing cases are less effective in detecting bugs.

However, you should note that testing case efficiency is not the only measure to check testing quality. Other parameters like test coverage, test time, and others are also important.

You can improve testing case efficiency in several ways; here are some:

  • Ensure that testing cases are well written and designed by considering all possible scenarios.
  • Automate time-consuming and repetitive testing cases. It will help in lowering the testing time of software applications.
  • Integrate CI/CD in Software Development Life Cycle.
  • The data used in the testing case should be realistic.

Tip: Including good testing case management practices can also improve testing case efficiency and, thereby overall software testing process of the application. Let us learn about testing case management.

Test Case Management

Test case development is not just limited to writing test cases; its management is equally essential. The approach to ensure the testing case is easily understood requires a thorough review. This necessitates consistency in the naming convention and related details.

A sanity check can be performed to ensure whether the step mentioned in the testing case to perform the test is understandable to the other testers. When new features or functionality are added to the software application, tests need to be more rigorous. This can create challenges in scaling the test suites. Therefore, the testing cases need to be written corresponding to the new modification made in the application.

To update testing cases and keep track, test management tools can be helpful. It easily integrates into your workflow and allows the team to view comments and audit trails. Some common examples of test management tools are TestRail, TestGear, Rational Quality Manager, etc.

Another key element of testing case management is reporting. The test case report reflects actionable insights on the proceeding of testing, its coverage, and the need for improvement. Thus, you should choose your test management according to your requirements.

Why Reuse Testing Cases?

Creating a testing case can be time-consuming and expensive, especially when a software project is complex. This is where testing case reuse comes in. It is the practice of reusing the existing testing cases in a different stage of the Software Development Life Cycle. There are some crucial reasons why the reuse of testing cases is beneficial:

  • It lowers the cost of testing. When you reuse the testing cases, the team can save time and effort in writing a new testing case every time.
  • You can ensure consistency in the testing software application. When you use the same tests across different phases of the Software Development Life Cycle, the team can ensure that software is thoroughly and consistently tested.
  • Reuse of testing cases increases test coverage. You can also identify potential errors which may get missed if the test is created from scratch.
  • You can speed up the testing process by reusing test cases. When you use the same testing case, it can be executed repeatedly without manual intervention. Thus saving time in the testing process.

Challenges in Writing Test Cases

Testers and developers spend most of their time writing, reviewing, and maintaining testing cases. However, there is a possibility that testers and developers may end up writing testing cases that fail to execute the successful test.

Such errors can happen with both new and experienced testers and developers. Unknowingly, we follow wrong processes without addressing that simple measures can fix them.

Below are the two major challenges in writing test cases that should be considered.

  • Composite steps

    Composite steps are the direction to move from one step to another. For example, if you give directions from point A to Y and say go to ABC place and then to RTY, it will not make any sense as we do not know how to get ABC in the first place. Instead, you should start the steps as-turn right and then go 1 km and turn left on street no 12 to reach RTY. This approach will give better results.

    Tip: Remember, the testing case is always about “how to test”; hence it is crucial to provide exact steps in your test.

  • Application behavior is considered as expected behavior

    In the current time, the dependency on applications to write testing cases increased due to a lack of documentation. So you may end up having the wrong testing cases.

    Let us understand this with an example:

    Case 1:

    Below are the testing case steps for shipping and returning products from an eCommerce website:

    • Launch the website.
    • Go to the My Order tab and click Return. The expected result: you will get the shipping and return page showing “put your information” and then click the Continue button.

    The above is an incorrect approach.

    Case 2:

    Redefined testing case steps:

    • Launch the website.
    • Go to the My Order tab and click Return.
    • Enter the order no of the product.
    • Click Continue, and the expected result: the description of orders for shipping and return is displayed.

    Case 2 is the correct way to write steps in cases, although the reference application does not behave correctly. It should only be taken as a guideline. Therefore, conduct thorough research and consider expected correct functionality to write expected behavior.

    Tip: Application as a reference has its limitations. Therefore always be critical in writing steps of testing cases.

It is always preferred to follow best practices in writing test cases to avoid challenges or limitations in the test process.

Best Practice for Writing Test Cases

To write good testing cases, specific considerations should be known by the testers and developers. You can follow below mentioned best practices to write testing cases.

  • Always try to reuse the testing case and maintain it whenever possible. It will save time and cost in testing software applications.
  • Keep the steps mentioned in the testing case simple and precise.
  • When you complete writing a testing case, it's best to review it from the view of testers.
  • When writing test cases, focus on how you can outsource them. For example, you should ensure that other teams can complete testing cases when you are occupied with other priority tasks.
  • Testing cases should include all necessary information, such as pre-conditions, test data, expected results, and actual results. This will help ensure that the testing case can be executed successfully and that the results can be accurately recorded and analyzed.
  • Focus on end-user requirements when you write testing cases. You should review the testing cases to check it covers all crucial aspects of the requirement. You can use Specification Documents and Requirements to meet end-user requirements.
  • Do not rewrite testing cases when multiple tests can be executed with the same test cases.
  • Try to keep the number of test steps as minimal as possible.
  • It is always preferred to run the test case in real browsers, OS, and devices. Therefore, ensuring your websites and web apps work seamlessly on multiple browsers, and OS combinations is important.

Cloud-based continuous testing platforms like LambdaTest lets you perform manual and automation testing for web and mobile applications on over 3000+ real browsers, devices, and operating system combinations. It also offers a range of automation testing frameworks like Selenium, Cypress, Playwright, Appium, and others and their integrations to allow one to write and run test cases effectively.

You can also Subscribe to the LambdaTest YouTube Channel and stay updated with the latest tutorials around Selenium testing, Playwright, Appium, and much more.

Conclusion

We have learned about test cases, ways to write, and related concepts. Going through this guide will give you complete information on test cases. Some key takeaways from this tutorial include the importance of using a consistent format, writing detailed test steps, including all necessary information, and covering all possible scenarios.

Frequently Asked Questions (FAQs)

Who writes test cases?

Software developers and testers write unit testing cases to check individual units like procedures and functions.

When do we create a test case?

Generally, the testing case is created early in the Software Development Life Cycle, like when you are at the requirement-gathering phase.

What is the priority of executing the test case?

The testing cases are executed in ascending orders on the priority list. Hence, a test case with low priority is run first.

How to write test cases in manual testing?

In manual testing, write test cases by specifying test steps, input data, expected results, and any preconditions or postconditions. Ensure clarity, completeness, and accuracy to effectively validate software functionality.

How to write test cases in Jira?

To write test cases in Jira, follow these steps: 1. Create a new issue in Jira and select ‘Test’ issue type. 2. Add a descriptive summary and detailed steps for the test case. 3. Include expected results and any test data needed. 4. Save the test case for execution and tracking.

How to write Junit test cases?

To write JUnit test cases, use the @Test annotation to mark test methods, set up preconditions with @Before, and clean up with @After. Use assertions like assertEquals to verify expected results against actual outcomes.

How to write test cases in Java?

To write test cases in Java, use testing frameworks like JUnit or TestNG. Define test methods with annotations, prepare test data, perform actions, and use assertions to validate expected outcomes.

How to write unit test cases?

To write unit test cases, follow these steps: 1. Identify a specific unit of code to test. 2. Define test scenarios, covering various input values and edge cases. 3. Write test code using testing frameworks. 4. Run the tests and analyze results.

How to write test cases in Python?

To write test cases in Python, use a testing framework like ‘unittest’ or ‘pytest’. Define test functions with assertions to check expected outcomes against actual results, and execute tests using the testing framework's runner.

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Nazneen Ahmad

Nazneen Ahmad is an experienced technical writer with over five years of experience in the software development and testing field. As a freelancer, she has worked on various projects to create technical documentation, user manuals, training materials, and other SEO-optimized content in various domains, including IT, healthcare, finance, and education. You can also follow her on Twitter.

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Salman Khan

Salman works as a Digital Marketing Manager at LambdaTest. With over four years in the software testing domain, he brings a wealth of experience to his role of reviewing blogs, learning hubs, product updates, and documentation write-ups. Holding a Master's degree (M.Tech) in Computer Science, Salman's expertise extends to various areas including web development, software testing (including automation testing and mobile app testing), CSS, and more.

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