Jest quiz

Test your Jest knowledge with a free interactive quiz — 50 questions with answers and explanations. No signup needed to play.

How do you mock a whole module?

1. How do you mock a whole module?
2. What is a "snapshot" test?
3. How do you declare a test case?
4. What is Jest?
5. How do you measure code coverage?
6. What does `jest.fn()` create?
7. What does `jest.useFakeTimers()` do?
8. How do you spy on an existing method without replacing it?
9. How do you assert a function throws?
10. Which command runs Jest?
11. What does `jest --watch` do?
12. How do you run setup code before each test in a `describe` block?

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