TestNG Interview Questions and Answers
Intermediate / 1 to 5 years experienced level questions & answers
Ques 1. Explain the key features of TestNG.
Key features of TestNG include annotations, grouping, parallel execution, data-driven testing, parameterization, and dependency management.
Ques 2. Explain dependency testing in TestNG.
Dependency testing in TestNG allows you to specify the order of test method execution by defining dependencies between them using the 'dependsOnMethods' attribute.
Ques 3. How can you achieve parallel execution of tests in TestNG?
Parallel execution in TestNG can be achieved by using the 'parallel' attribute in the suite or test tag in the testng.xml file or by using the parallel attribute in the @Test annotation.
Ques 4. What is the purpose of the soft assert in TestNG?
The soft assert in TestNG allows you to collect multiple assertions during the execution of a test, even if one or more assertions fail. It doesn't stop the test execution immediately after the first assertion failure.
Ques 5. Explain the use of groups in TestNG.
Groups in TestNG allow you to categorize test methods. You can then include or exclude specific groups while running tests, providing flexibility in test execution.
Ques 6. Explain the concept of listeners in TestNG.
Listeners in TestNG allow you to customize and control the test execution process. Examples include TestListener, ITestListener, IAnnotationTransformer, and IInvokedMethodListener.
Ques 7. How can you perform data-driven testing in TestNG?
Data-driven testing in TestNG can be achieved by using the @DataProvider annotation or the dataProvider attribute in the @Test annotation, allowing you to supply different sets of data to the test method.
Ques 8. How can you perform cross-browser testing in TestNG?
Cross-browser testing in TestNG can be achieved by parameterizing the browser type and using the @Parameters annotation or the dataProvider attribute to supply different browsers to the test method.
Ques 9. What is the purpose of the @Listeners annotation in TestNG?
The @Listeners annotation in TestNG is used to specify one or more listener classes that will be notified during the test execution. This allows you to implement custom behavior at various stages of the test lifecycle.
Ques 10. What is the purpose of the @Listeners annotation in TestNG?
The @Listeners annotation in TestNG is used to specify one or more listener classes that will be notified during the test execution. This allows you to implement custom behavior at various stages of the test lifecycle.
Ques 11. Explain the use of the 'dependsOnGroups' attribute in TestNG.
The 'dependsOnGroups' attribute in TestNG allows you to specify groups that must be executed before the current test method. It establishes a dependency relationship between groups.
Ques 12. How can you group tests using regular expressions in TestNG?
Tests can be grouped using regular expressions in TestNG by specifying the 'groups' attribute in the testng.xml file with a regular expression pattern that matches the desired test groups.
Ques 13. What is the purpose of the 'preserveOrder' attribute in the @Test annotation?
The 'preserveOrder' attribute in the @Test annotation, when set to 'true', ensures that the order of test methods is preserved as defined in the testng.xml file, even when parallel execution is enabled.
Ques 14. Explain the concept of parameterization in TestNG.
Parameterization in TestNG allows you to run the same test method with different sets of data. This can be achieved using the @Parameters annotation or data providers.
Ques 15. Explain the use of the 'parallel' attribute in the tag in testng.xml.
The 'parallel' attribute in the
Ques 16. Explain the use of the 'alwaysRun' attribute in the @DataProvider annotation.
The 'alwaysRun' attribute in the @DataProvider annotation ensures that the data provider method always runs, even if no test method depends on it. It helps in providing data dynamically.
Ques 17. How can you skip a test method conditionally in TestNG?
Conditional skipping of a test method in TestNG can be achieved by using the 'enabled' attribute in the @Test annotation along with a condition that evaluates to true or false.
Ques 18. Explain the purpose of the 'threadPoolSize' attribute in the @Test annotation.
The 'threadPoolSize' attribute in the @Test annotation specifies the number of threads in the thread pool for parallel execution. It determines how many parallel instances of the test method should run.
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