Testing / Playwright Interview questions

What is the difference between test.beforeEach and test.beforeAll?

Both are setup hooks, but they run at different scopes within a test file.

test.beforeEach	test.beforeAll
Runs before every single test in the file/describe block	Runs once before all tests in the file/describe block
Receives per-test fixtures like page	Runs in a worker-scoped context, not tied to one test's page
Good for resetting state each test	Good for expensive one-time setup shared across tests

A common mistake is using beforeAll to log in and reusing that same page across tests - since beforeAll isn't given a fresh per-test page fixture the way beforeEach is, this pattern tends to leak state between tests and is generally discouraged in favor of saved authentication state instead.

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test.beforeEach runs: Once per file, before any test

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Before every individual test

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Only after all tests finish

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A common pitfall is using beforeAll to: Reset a database once, which is fine

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Log in and reuse the same page across tests, leaking state

✓ Correct! Well done.

Skip setup entirely

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