Top 25 TestNG Interview Questions and Answers in 2024

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TestNG Interview Questions and Answers

TestNG is one of the most widely used systems and automated Testing screening structures. In this tutorial, we have compiled the top often asked TestNG Interview Questions and Answers for both fresher and experienced experts.

1. What Is TestNG?

TestNG (NG for Future Generation) is a testing structure that one can integrate with Selenium or any other automation tool to give several capacities like assertions, reporting, parallel test implementation, and so on.

2. What Are Some Advantages Of TestNG?

Complying with are the advantages of TestNG-.

  • TestNG provides different assertions that aid in examining the expected and actual results.
  • It provides identical execution of test techniques.
  • We can specify the dependence of one examination approach over others in TestNG.
  • We can assign concern to evaluate techniques in Selenium.
  • It enables the grouping of test approaches right into test groups.
  • It permits data-driven Testing making use of the @DataProvider comment.
  • It has inherent support for coverage.
  • It has support for parameterizing test instances utilizing the @Parameters note.

3. Exactly How Is TestNG Different From Selenium Webdriver?

Selenium is an automation tool making use of which we can automate online applications. To include screening abilities in the Examination Automation suites– Selenium is clubbed with TestNG. With TestNG, we can have different attributes in our automation collection like different sorts of assertions, reporting, identical execution, parameterization, and so on.

For Automation Screening, Selenium assists with ‘automation,’ and TestNG assists with ‘testing’ capabilities.

4. What Is Making Use Of The TestNG.Xml File?

The testng.xml documents are used to set up the whole examination suite. In testng.xml documents, we can produce an examination collection, create examination groups, mark examinations for parallel execution, include audiences, and pass criteria to check manuscripts. We can likewise use this testng.xml apply for activating the test suite from the command prompt/terminal or Jenkins.

5. What Are Some Commonly Made Use Of TestNG Notes?

The generally utilized TestNG notes are-.

  • @Test– @Test annotation marks a technique as a Test technique.
  • @BeforeSuite– The annotated approach will run only before all tests in this suite have run.
  • @AfterSuite– The annotated approach will undoubtedly run just as soon as examinations in this collection have run.
  • @BeforeClass– The annotated method will undoubtedly run just when before the initial test method in the present class is conjured up.
  • @AfterClass– The annotated method will undoubtedly run just once; nevertheless, the test approaches in the present class have been run.
  • @BeforeTest– The annotated method will run before any test technique belonging to the courses inside the <test> tag.
  • @AfterTest– The annotated technique will pursue all the test methods coming from the classes inside the <test> tag have run.
  • @BeforeMethod– The annotated approach will run before each test technique marked by @Test annotation.
  • @AfterMethod– The annotated technique will pursue each examination method marked by the @Test comment.
  • @DataProvider– The @DataProvider comment is utilized to pass examination data to the examination technique. The examination approach will certainly run according to the variety of rows of information passed using the data company method.

6. Exactly How To Share The Task Record Utilizing TestNG?

There are a couple of means to do so:

  • After the TestNG class’s implementation, one tab called “Result of running class” is produced alongside the console. We can duplicate this and share it.
  • After the execution of the TestNG course,
  • Right-click on the project name and refresh.
  • Click on the “Test-output” folder.
  • Right-click on the “index.html” file and pick residential properties.
  • Duplicate the web link beside “Area.”

7. What Are @Factory As Well As @Dataprovider Comments?

  • @Factory: A factory will execute all the test methods existing inside an examination course utilizing different circumstances of the corresponding class with a different data set.
  • @DataProvider: A test approach that uses DataProvider will be implemented the specific methods numerous times based on the information given by the DataProvider. The test approach will be implemented using the very same instance of the examination class to which the examination method belongs.

8. Define The Similarities And Distinctions Between Junit And TestNG System Screening Structures?


  • Timeout Examination is possible quickly in both the structures making use of @Test( timeOut =-RRB-.
  • We can overlook specific test case execution of software program web application from a suite in both the structures (In Junit @Ignore complied with by @Test, In TestNG @Test( make it possible for= false)).
  • It is feasible to produce anticipated exception examination for software program internet applications in both the frameworks making use of @Test( anticipated =. course).
  • Notes – A couple of annotations are similar in both structures suite like @Test, @BeforeClass, and @AfterClass.


  • In TestNG, Parameterized examination configuration is straightforward, while it is very tough to set up Parameterized test in JUnit.
  • TestNG support system test using @Test( groups= ), yet it is not supported in JUnit.
  • TestNG has an attribute to set up dependence test utilizing @Test( depends on methods = ). Dependency test setup for software application internet application is not possible in JUnit.
  • TestNG assistance @BeforeTest, @AfterTest, @BeforeSuite, @AfterSuite, @BeforeGroups, and @AfterGroups are not supported in JUnit.
  • Examination prioritization and identical Testing are feasible in TestNG utilizing the DataProvider approach and textng.xml file. JUnit does not support it.

9. How To Run A Team Of Test Cases Using TestNG?

TestNG allows you to do innovative groupings of examination approaches. Not only can you proclaim that approaches belong to groups, but you can also specify teams that contain other groups. After that, TestNG can be conjured up and asked to consist of a specific set of groups (or regular expressions) while omitting one more set. This provides you the maximum flexibility in just how you partition your examinations and does not need you to recompile anything if you intend to run two different collections of examinations back to back. Groups are defined in your testng.xml documents and can be located under the or tag. Teams defined in the tag apply to all the tags underneath.

10. Can You Define The Significant Attributes Of TestNG?

TestNG has numerous significant functions like:

  • Support of @DataProvider annotation to do information driven Testing on software program web application
  • We can set up reliant examination methods in TestNG indicates TestTwo () relies on TestOne (). We can additionally configure that if the earlier test approach (TestOne ()) stops working throughout implementation after that dependent software application examination technique (TestTwo ()) needs to be executed or not.
  • Support setting up test groups like backend test-group, frontend test-group, etc.; we can tell TestNG to implement only specific group/groups.
  • TestNG is sustained by many devices and plug-ins like Eclipse, Maven, CONCEPT, and so on – Create HTML and XSLT test execution reports for software applications, internet applications, and so on.

11. What Is The Identical Execution Of Classes In TestNG?

TestNG gives an ability to test classes in parallel. By utilizing parallel implementation of courses, one will begin each course and implement it simultaneously in various strings. Let us check out a typical example for Parallel Implementation of Classes utilizing testng.xml. We will develop two courses with 2 examination techniques each and try to execute them in various strings. Produce class and name it:

12. What Is Using The @Listener Comment In TestNG?

TestNG offers us various audiences using which we can perform some activity in case an event has activated. Generally, testNG listeners are utilized for setting up records and logging. One of the most widely used listeners in testNG is the ITestListener interface.

We must implement this interface, developing an audience course of our own. After making use of the @Listener note, we can define that our customized listener course needs to be utilized for an examination class.

13. What Is Data provider Annotation In TestNG, And Why Do You Utilize It?

The TestNG framework presented the information provider note to sustain data-driven screening. It permits us to use both interior and outside resources of input. We can keep the information inside the task documents if the input size is tiny. Nevertheless, for the most part, the need is to have a vast dataset to feed into the test cases. And no tester or developer would love to bloat their code with such a substantial collection of input. For this reason, the option is to use the TestNG “@DataProvider” comment. It can permit an examination to accept input from outside data sources like CSV, MS Excel, and numerous others.

14. Exactly How To Set Top Priorities In TestNG?

There is constantly more than one test or method in the course. If we do not focus on these tests or techniques, the approaches are selected alphabetically and carried out during execution. To run the examinations in the series we desire, we must set the top priority with the @Test comment.

This can be done as complies with: @Test (concern= 1), @Test (top priority= 2).

15. Exactly How Is TestNG Better Than Junit?

A number of features in TestNG are not present in JUnit. The benefits of TestNG over JUnit are.

  • Annotations in TestNG are easier than in JUnit.
  • Restraints like @BeforeClass and @AfterClass are not present in TestNG, unlike JUnit.
  • There is no method name restriction in TestNG like in JUnit.
  • A Group of test cases is feasible in TestNG.
  • There are 3 setup/teardown levels in TestNG: @Before/ AfterSuite, @Before/ AfterTest and also @Before/ AfterGroup.
  • You can specify reliant test cases where every test case is independent of others in TestNG.
  • You can carry out test cases in groups in TestNG.
  • You can run multiple Selenium test cases in TestNG.

16. What Is The Difference Between @Beforeclass And @Beforemethod?

There are 2 main distinctions between @BeforeClass as well as @BeforeMethod. They are as follows.

  • The method with @BeforeClass will be executed just as soon as any of the current course’s tests are run. In contrast, a technique annotated with @BeforeMethod will be carried out before each method annotated with @Test.
  • One can utilize the second @BeforeClass note to establish the arrangement and initialization in all examination methods in the current course. For instance, we can establish a motorist arrangement that will prevail for all examinations in the course.

@BeforeMethod can be used to establish that data duplicating prior to each @Test annotated technique.

17. Mention Different Ways You Can Produce Reports For TestNG Results?

There are two means to produce a record with Examination NG. They are.

  • For an audience course to apply, the class must implement the org. testing./ TestListener interface. These classes are notified at runtime by TestNG when the test starts, finishes, skips, passes or falls short.
  • For a reporting course, the course must execute an org.TestNG/ Reporter interface. When the whole suite run finishes, these courses are called. When called the item being composed, the details of the whole test run are delivered to this class.

18. Exactly How Will You Implement Examinations From A TestiNG Team?

We can follow two methods to run a group in TestNG.

  • Run via TestNG XML documents.
  • Carry Out from Eclipse IDE.

In the TestNG XML, there is a “teams” tag that has subtags, notably “include”/” exclude.” we can add our teams to the “consist of” tag to notify TestNG to run all the examinations inside it. The framework will certainly look at the groups in the examination courses that contributed to the “courses” tag. We can also overlook a team by including it in the “omit” component.

19. What Stages Are Involved In The Software Program Testing Life Process?

The different stages associated with the software program screening life process are:

  • Requirement Evaluation

Below, the QA team recognizes the requirements and recognize the testable requirements.

  • Test Preparation

In this phase, the examination method is specified.

  • Test Case Development

Right here, in-depth test cases are specified and developed.

  • Environment Setup

It is an arrangement of software programs and equipment for the screening teams to execute test cases.

  • Examination Execution

It is performing the code and contrasting the expected and actual outcomes.

  • Test Cycle Closure

It involves calling out the testing employee Interview and examining cycle conclusion requirements based on examination coverage, top quality, cost, time, crucial company objectives, and software.

20. What Are The Different Methods Of Screening?

There are 3 approaches to software application screening as well as they are as complies with:

  • Black-box screening is a screening method based only on demands and specifications. In this approach, it needs no understanding of interior courses, frameworks, or execution of the software program being examined.
  • White box testing: It is a screening method based upon internal paths, code structures, and implementation of the software program being checked. White box screening usually needs in-depth shows abilities.
  • Gray box screening: It is a method for software application debugging in which the tester has a restricted understanding of the interior information of the program.

21. Explain Pest Life Process Or Flaw Life Cycle.

A problem life cycle is a process in which a defect undergoes different stages throughout its lifetime. It begins when a defect is found and ends when it is closed after ensuring it’s not duplicated.

The bug or problem life process includes the steps highlighted in the figure below. It can vary from company to company, and from job to job, based on numerous aspects like company policy, software application advancement design utilized (like Agile, Iterative), project timelines, team structure, etc.

22. What Is Confirmation As Well As Validation In Software Application Testing?

  • Verification: It is a fixed evaluation strategy. Here, screening is done without carrying out the code. Examples include– Testimonials, evaluations, as well as a walkthrough.
  • Recognition: It is a dynamic analysis method where screening is done by performing the code. Instances include helpful as well as non-functional testing methods.

In the V version, the advancement and QA activities are done simultaneously. There is no distinct stage called Testing. Instead, Testing begins right from the demand phase. The verification, as well as recognition tasks, go together.

23. What Are The Classifications Of Defects?

There are three main categories of defects, as displayed in the below figure:

  • Incorrect: It implies that demands have been executed incorrectly. It is a variation from the offered specification.
  • Missing: This is a difference from the specifications, a sign that one did not apply a spec or did not correctly note a customer requirement.
  • Additional: It is a need included in the item that the end client did not give. It is constantly a variance from the requirements however might be a characteristic preferred by the customer of the item.

24. What Is Insurance Coverage, And What Are The Various Insurance Coverage Techniques?

The parameter used in software application screening to define the degree to which the resource code is examined known as insurance coverage. There are 3 standard kinds of coverage methods, and also they are:

  • Statement insurance coverage: It ensures that each line of source code has been executed and tested.
  • Decision protection: Every decision (true/false) in the source code has been carried out and checked.
  • Course insurance coverage: We guarantee that every feasible route via an offered part of the code is performed and tested.

25. Why Is Selenium A Favored Tool For Automation Testing?

Selenium is an open resource tool used to automate examinations executed on internet browsers. Since Selenium is open-source, no licensing price is included, which is a significant advantage over other screening tools. Various other reasons behind Selenium’s ever-growing popularity are:

  • Examination manuscripts can be written in any one of these programming languages: Java, Python, C#, PHP, Ruby, Perl, and Net
  • One can accomplish examinations in any of these OS: Windows, Mac, or Linux
  • Examinations can be executed utilizing any web browser: Mozilla Firefox, Web Traveler, Google Chrome, Safari, or Opera
  • One can incorporate it with tools such as TestNG &amp; JUnit for taking care of test cases and producing records
  • One can incorporate it with Virtuoso, Jenkins &amp; Docker to accomplish Continuous Testing


We’ve just reviewed 25 of the most common questions you might expect in your next interview related to TestNG. Remember, practice makes perfect. Review these concerns and their respective responses to have a better chance of landing one of these dream jobs.