TestNG interview questions — Hard
126 hard-level TestNG questions from our Automation Testing bank, each with the correct answer and an explanation of why it is correct.
This topic slice is available to practise but is not yet part of our indexed set.
What this covers
TestNG appears throughout Automation Testing interviews. At hard level, interviewers are typically checking depth under pressure — edge cases, failure modes, performance characteristics, and the trade-offs you accepted. Work through these, then explain your answer out loud; the second part is what interviews actually test.
5 example questions
1. Regarding TestNG, which of the following is a false statement?
- A. Higher priority values run before lower priority values.correct
- B. The @DataProvider annotation supplies multiple data sets to a test method for data-driven testing.
- C. Groups allow including or excluding categorized tests at runtime.
- D. TestNG supports parallel execution at methods, classes, tests, or instances level via the parallel attribute.
Why: The selected statement is false. The other options are accurate statements about TestNG.
2. While onboarding a junior QA, you explain: When does a TestNG @BeforeMethod run?
- A. Once before all tests.
- B. Before each @Test method.correct
- C. Before the first @Test only.
- D. After every @Test.
Why: @BeforeMethod runs before every @Test; @BeforeClass runs once per class.
3. Which statement about TestNG is NOT correct?
- A. TestNG cannot run tests in parallel without a third-party plugin.correct
- B. Testng.xml defines suites, tests, groups, parameters, and parallel execution settings.
- C. ITestListener lets you hook into events like onTestFailure for custom reporting or screenshots.
- D. The @DataProvider annotation supplies multiple data sets to a test method for data-driven testing.
Why: The selected statement is false. The other options are accurate statements about TestNG.
4. Which of the following statements about TestNG is FALSE?
- A. TestNG has no listener mechanism for reacting to test failures.correct
- B. DependsOnMethods makes one test run only after another test passes.
- C. @BeforeMethod runs before each test method, while @BeforeClass runs once per class.
- D. TestNG supports parallel execution at methods, classes, tests, or instances level via the parallel attribute.
Why: The selected statement is false. The other options are accurate statements about TestNG.
5. Identify the INCORRECT statement about TestNG:
- A. Groups allow including or excluding categorized tests at runtime.
- B. ExpectedExceptions asserts that a test throws a specific exception.
- C. Testng.xml defines suites, tests, groups, parameters, and parallel execution settings.
- D. Higher priority values run before lower priority values.correct
Why: The selected statement is false. The other options are accurate statements about TestNG.