Testng Important Interview Questions: “Automation Testing Important Interview Questions”

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Introduction:


TestNG (Test Next Generation) is a testing framework for Java that is inspired by and extends JUnit. It is designed to cover a wider range of test categories and provides more powerful and flexible features than JUnit. it is open source testing framework. TestNG is particularly popular for test-driven development (TDD) and continuous integration testing. Here’s a detailed explanation of TestNG:

Key Features of Test-NG:

  1. Annotations:
    • TestNG uses annotations to mark methods as test methods, configuration methods, and more. Common annotations include @Test, @BeforeTest, @AfterTest, @BeforeMethod, and @AfterMethod
    • used to define the functionality of methods.
  2. Parallel Execution:
    • TestNG supports parallel execution of tests, allowing you to run test classes or methods concurrently. This is useful for reducing test execution time.
    • Parallel execution can be configured at various levels such as classes, methods, and suites.
  3. Test Configuration:
    • TestNG allows the use of configuration methods (@BeforeMethod, @AfterMethod) for setting up and tearing down test environments.
    • Configuration methods can be organized at the suite, test, class, or method level.
  4. Grouping:
    • Tests can be grouped together using the groups attribute, and you can run specific groups of tests using the TestNG XML configuration file.
    • Grouping allows you to categorize tests based on their characteristics or functionalities.
  5. Parameterization:
    • TestNG supports parameterization, allowing you to run the same test method with different sets of data.
    • Data providers can be used to supply data to test methods, enhancing test coverage.
  6. Dependencies:
    • You can define dependencies between test methods or groups, ensuring that certain tests run only if their dependent tests pass.
    • Dependencies are declared using the dependsOnMethod and dependsOnGroups attributes.
  7. Listeners:
    • TestNG provides listeners that allow you to perform custom actions during test execution. Common listeners include ITestResult.
    • Listeners can be used for logging, reporting, or customizing the behavior of test methods.
  8. Assertions:
    • Test-NG provides a wide range of assertions for verifying expected results. If an assertion fails, the corresponding test method is marked as a failure.
    • Assertions include methods like HardAssert, SoftAssert, AssertEquals and more.
  9. Test Suites:
    • TestNG allows you to define test suites using XML configuration files. Test suites can include multiple test classes and configurations.
    • Suites provide a way to organize and execute a set of related tests together.
  10. Data Providers:
    • Data providers in Test-NG allow you to pass parameters to test methods. A data provider method supplies data to the test method, and the test method is executed multiple times with different sets of data.

Conclusion:

Test-NG provides comprehensive documentation, and users are encouraged to refer to the for detailed information on all features and configurations. it also provides advanced annotations, Parallel testing is possible in Testng, We can execute failed test cases separately.