Testing · Middle · Question 40 of 75

What is a setup file (`setupFiles` in Vitest, `setupFilesAfterEnv` in Jest) used for?

✓Correct answer: Shared setup for every test file: jest-dom matchers, MSW server, polyfills, global mocks
2Listing which tests to run
3Building the app before tests

Explanation

Jest's setupFilesAfterEnv runs after the test framework is installed, so expect.extend and hooks like afterEach are available there.

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