Testing · Senior · Question 34 of 75

What does `act()` guarantee in React tests?

✓Correct answer: That all updates, effects and scheduled work triggered inside it are flushed before assertions run
2That the component renders without errors
3That the test runs in the browser

Explanation

The test environment must have IS_REACT_ACT_ENVIRONMENT = true (RTL sets it); otherwise React doesn't warn about missing act.

Further reading

React: act ↗

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