JUnit quiz

Test your JUnit knowledge with a free interactive quiz — 40 questions with answers and explanations. No signup needed to play.

What is JUnit?

1. What is JUnit?
2. What does @Test(expected = IllegalArgumentException.class) do?
3. What does verify(inventoryClient, never()).reserve(anyString(), anyInt()) check?
4. In Mockito, what does @Mock do when applied to a field in a test class run with MockitoJUnitRunner?
5. What does the @RunWith annotation do on a JUnit 4 test class?
6. What does assertArrayEquals(new int[]{1, 2, 3}, sortResult) verify?
7. What must be true of methods annotated with @BeforeClass?
8. How many instances of a test class does JUnit typically create when running a class with 3 @Test methods?
9. Which static class provides JUnit 4's core assertion methods like assertEquals and assertTrue?
10. What is the purpose of the @Before annotation?
11. Which import is conventionally used to call assertion methods without the "Assert." prefix?
12. What is a JUnit 4 test suite (@RunWith(Suite.class) with @Suite.SuiteClasses)?

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