Testing · Junior · Question 19 of 78

How do you check that a function throws an error?

expect(() => parse("bad")).toThrow("Invalid input");

✓Correct answer: Pass a function that calls the code, so expect can catch the error
2Call parse("bad") directly inside expect
3Use toBeFalsy() on the result

Explanation

expect(parse("bad")) would throw before expect gets control and the test would fail with that error instead of checking it.

Further reading

Jest: Expect ↗

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