Quiz for Unit Testing

Q1: What is the main purpose of unit testing?

A. Test user interfaces B. Verify code quality C. Test individual units of code D. Optimize performance

Q2: Which Java framework is commonly used for unit testing?

A. Selenium B. JUnit C. TestNG D. Mockito

Q3: Which annotation is used in JUnit to define a test method?

A. @Mock B. @RunWith C. @Test D. @Before

Q4: Which method is executed before every test case in JUnit?

A. setup() B. init() C. @BeforeEach D. @BeforeAll

Q5: What is test coverage?

A. Lines of code tested by unit tests B. Time taken to run tests C. Lines skipped during testing D. Memory used in tests

Q6: Which assertion checks if two values are equal in JUnit?

A. assertTrue() B. assertEquals() C. assertSame() D. assertThat()

Q7: What does mocking mean in unit testing?

A. Creating a duplicate of test method B. Testing the UI only C. Using fake objects to test behavior D. Testing performance only

Q8: Which tool is commonly used for mocking in Java?

A. JUnit B. Selenium C. Mockito D. Log4j

Q9: Which annotation is used to run code before all test methods?

A. @Before B. @BeforeAll C. @AfterAll D. @RunWith

Q10: Which JUnit version introduced annotations like @Test, @Before, @After?

A. JUnit 3 B. JUnit 4 C. JUnit 5 D. JUnit 2

Q11: What does the assertTrue() method do?

A. Fails the test unconditionally B. Asserts if a condition is true C. Checks if an object is null D. Compares two strings

Q12: Which annotation is used to disable a test method in JUnit 5?

A. @Disabled B. @Ignore C. @Exclude D. @TestOff

Q13: What does TDD stand for in software development?

A. Total Design Document B. Test-Driven Development C. Test Deployment Diagram D. Technical Debugging Design

Q14: Which assertion checks if a value is null?

A. assertNotNull() B. assertNull() C. assertEmpty() D. assertThat()

Q15: What does @AfterEach do in JUnit 5?

A. Runs after the entire test class B. Runs after every test method C. Runs only once before all tests D. Skips test execution

Q16: Which annotation is used to inject mocks in Mockito?

A. @InjectMock B. @AutoMock C. @MockInject D. @InjectMocks

Q17: In unit testing, what is a test suite?

A. A single test case B. A group of related test cases C. A class that fails testing D. A test for UI

Q18: What does the assertNotNull() method verify?

A. That a value is zero B. That a string is empty C. That an object is not null D. That a number is negative

Q19: Which tool can generate code coverage reports in Java?

A. Maven B. Log4j C. JaCoCo D. Jenkins

Q20: What is the benefit of unit testing?

A. Reduces memory usage B. Improves UI design C. Helps detect bugs early D. Slows development