{"id":502,"date":"2026-04-29T18:14:30","date_gmt":"2026-04-29T18:14:30","guid":{"rendered":"https:\/\/logicnextgen.com\/tutorials\/?page_id=502"},"modified":"2026-05-23T14:08:02","modified_gmt":"2026-05-23T14:08:02","slug":"testng-interview-questions-and-answers","status":"publish","type":"page","link":"https:\/\/logicnextgen.com\/tutorials\/testng-interview-questions-and-answers\/","title":{"rendered":"TestNG Interview Questions & Answers"},"content":{"rendered":"\n

TestNG Interview Questions & Answers<\/strong><\/p>\n\n\n\n

1. What is TestNG?<\/strong><\/h3>\n\n\n\n


TestNG (Test Next Generation) is a testing framework inspired by JUnit and NUnit but designed to be more powerful and flexible. It supports annotations, parallel execution, data-driven testing, and reporting.<\/p>\n\n\n\n

2. What are the main features of TestNG?<\/strong><\/h3>\n\n\n\n
    \n
  • Annotation-based testing<\/li>\n\n\n\n
  • Parallel test execution<\/li>\n\n\n\n
  • Data-driven testing using DataProvider<\/li>\n\n\n\n
  • Flexible test configuration<\/li>\n\n\n\n
  • Dependency management<\/li>\n\n\n\n
  • Detailed reporting<\/li>\n<\/ul>\n\n\n\n

    3. What are TestNG annotations?<\/strong><\/h3>\n\n\n\n


    <\/strong> Annotations define how methods should behave in a test. Common ones include:<\/p>\n\n\n\n

      \n
    • @Test \u2013 marks a test method<\/li>\n\n\n\n
    • @BeforeMethod \/ @AfterMethod<\/li>\n\n\n\n
    • @BeforeClass \/ @AfterClass<\/li>\n\n\n\n
    • @BeforeSuite \/ @AfterSuite<\/li>\n<\/ul>\n\n\n\n

      4. What is the difference between @BeforeMethod and @BeforeClass?<\/strong><\/h3>\n\n\n\n
        \n
      • @BeforeMethod: runs before each test method<\/strong><\/li>\n\n\n\n
      • @BeforeClass: runs once before all test methods in a class<\/strong><\/li>\n<\/ul>\n\n\n\n

        5. What is the difference between TestNG and JUnit?<\/strong><\/h2>\n\n\n\n
        TestNG<\/strong><\/td>JUnit<\/strong><\/td><\/tr>
        Supports parallel execution<\/td>Limited parallel support<\/td><\/tr>
        Supports dependency testing<\/td>No dependency feature<\/td><\/tr>
        Supports DataProvider<\/td>Limited parameterization<\/td><\/tr>
        More flexible annotations<\/td>Fewer annotations<\/td><\/tr>
        Better reporting<\/td>Basic reporting<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

        6. What is <\/strong>testng.xml<\/strong> file?<\/strong><\/h2>\n\n\n\n

        testng.xml is a configuration file used to control test execution in TestNG.<\/p>\n\n\n\n

        It helps to:<\/p>\n\n\n\n

          \n
        • Define test suites<\/li>\n\n\n\n
        • Group tests<\/li>\n\n\n\n
        • Run tests in parallel<\/li>\n\n\n\n
        • Pass parameters<\/li>\n\n\n\n
        • Control execution order<\/li>\n<\/ul>\n\n\n\n

          Example:<\/p>\n\n\n\n

          <suite name=\"Suite\">\n  <test name=\"Test\">\n     <classes>\n        <class name=\"tests.LoginTest\"\/>\n     <\/classes>\n  <\/test>\n<\/suite<\/code><\/pre>\n\n\n\n
          7. What are groups in TestNG?<\/strong><\/h2>\n\n\n\n
          Groups are used to categorize test methods.<\/p>\n\n\n\n
          Example:<\/p>\n\n\n\n
          @Test(groups = \"smoke\")\npublic void loginTest() {\n}<\/code><\/pre>\n\n\n\n
          You can run only specific groups using testng.xml.<\/p>\n\n\n\n
          8. What is the use of dependsOnGroups<\/code> in TestNG?<\/strong><\/h2>\n\n\n\n
          It allows a test method to depend on an entire group of tests.<\/p>\n\n\n\n
          Example:<\/p>\n\n\n\n
          Groups are used to categorize test methods.<\/p>\n\n\n\n
          Example:<\/p>\n\n\n\n
          @Test(groups = \"smoke\")\npublic void loginTest() {\n}<\/code><\/pre>\n\n\n\n
          You can run only specific groups using testng.xml.<\/p>\n\n\n\n
          9. What is dependency in TestNG?<\/strong><\/p>\n\n\n\n
          Dependency means one test method depends on another test method.<\/p>\n\n\n\n
          Example:<\/p>\n\n\n\n
          @Test\npublic void login() {\n}\n\n@Test(dependsOnMethods = \"login\")\npublic void dashboard() {\n}<\/code><\/pre>\n\n\n\n
          If login() fails, dashboard() will be skipped.<\/p>\n\n\n\n
          10. What is the difference between Hard Assert and Soft Assert?<\/strong><\/p>\n\n\n\n
          Hard Assert<\/h3>\n\n\n\n
            \n
          • Stops execution immediately if assertion fails.<\/li>\n<\/ul>\n\n\n\n
            Assert.assertEquals(actual, expected);<\/code><\/pre>\n\n\n\n
            Soft Assert<\/h4>\n\n\n\n
              \n
            • Continues execution even after assertion failure.<\/li>\n<\/ul>\n\n\n\n
              SoftAssert sa = new SoftAssert();\nsa.assertEquals(actual, expected);\nsa.assertAll();<\/code><\/pre>\n\n\n\n
              11. What is assertion in TestNG?<\/strong><\/h2>\n\n\n\n
              Assertions are used to validate expected and actual results.<\/p>\n\n\n\n
              Common assertions:<\/p>\n\n\n\n
                \n
              • assertEquals()<\/li>\n\n\n\n
              • assertTrue()<\/li>\n\n\n\n
              • assertFalse()<\/li>\n\n\n\n
              • assertNull()<\/li>\n<\/ul>\n\n\n\n
                12. What is parameterization in TestNG?<\/strong><\/h2>\n\n\n\n
                Parameterization allows passing values to test methods from testng.xml.<\/p>\n\n\n\n
                Example:<\/p>\n\n\n\n
                <parameter name=\"browser\" value=\"chrome\"\/>\n@Parameters(\"browser\")\n@Test\npublic void launch(String browser) {\n}<\/code><\/pre>\n\n\n\n
                13. What is the difference between Parameters and DataProvider?<\/strong><\/h2>\n\n\n\n
                Parameters<\/strong><\/td>DataProvider<\/strong><\/td><\/tr>
                Values from XML<\/td>Values from Java method<\/td><\/tr>
                Used for simple data<\/td>Used for multiple datasets<\/td><\/tr>
                Less flexible<\/td>More flexible<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                14. How can you run tests in parallel in TestNG?<\/strong><\/h2>\n\n\n\n
                Using parallel attribute in testng.xml.<\/p>\n\n\n\n
                Example:<\/p>\n\n\n\n
                <suite name=\"Suite\" parallel=\"tests\" thread-count=\"2\">

                <\/code><\/pre>\n\n\n\n
                15. What is invocationCount in TestNG?<\/strong><\/p>\n\n\n\n
                It is used to run a test multiple times.<\/p>\n\n\n\n
                Example:<\/p>\n\n\n\n
                @Test(invocationCount = 5)\npublic void testMethod() {\n}<\/code><\/pre>\n\n\n\n
                16. What is priority in TestNG?<\/strong><\/p>\n\n\n\n
                Priority controls execution order of test methods.<\/p>\n\n\n\n
                Example:<\/p>\n\n\n\n
                @Test(priority = 1)\npublic void login() {\n}\n\n@Test(priority = 2)\npublic void logout() {\n}<\/code><\/pre>\n\n\n\n
                Lower priority executes first.<\/p>\n\n\n\n
                17. What happens if priority is not set?<\/strong><\/h2>\n\n\n\n
                Test methods execute in alphabetical order by method name.<\/p>\n\n\n\n
                18. What is timeout in TestNG?<\/strong><\/h2>\n\n\n\n
                Timeout defines maximum execution time for a test.<\/p>\n\n\n\n
                Example:<\/p>\n\n\n\n
                @Test(timeOut = 3000)\npublic void test() {\n}<\/code><\/pre>\n\n\n\n
                Test fails if execution exceeds 3 seconds.
                <\/p>\n\n\n\n
                19. What is enabled=false in TestNG?<\/strong><\/p>\n\n\n\n
                Used to skip a test method.<\/p>\n\n\n\n
                Example:<\/p>\n\n\n\n
                @Test(enabled = false)\npublic void skipTest() {\n}<\/code><\/pre>\n\n\n\n
                20. What is the difference between <\/strong>@BeforeTest<\/strong> and <\/strong>@BeforeSuite<\/strong>?<\/strong><\/h2>\n\n\n\n
                @BeforeTest<\/strong><\/td>@BeforeSuite<\/strong><\/td><\/tr>
                Runs before test tag<\/td>Runs before entire suite<\/td><\/tr>
                Executes multiple times<\/td>Executes once<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                21. How do you skip a test in TestNG?<\/strong><\/h2>\n\n\n\n
                Two ways:<\/p>\n\n\n\n
                  \n
                1. enabled = false<\/li>\n\n\n\n
                2. Using SkipException<\/li>\n<\/ol>\n\n\n\n
                  Example:<\/p>\n\n\n\n
                  throw new SkipException(\"Skipping test\")<\/code><\/pre>\n\n\n\n
                  22. What are listeners in TestNG?<\/strong><\/h2>\n\n\n\n
                  Listeners are interfaces that modify TestNG behavior during execution.<\/p>\n\n\n\n
                  Common listeners:<\/p>\n\n\n\n