Testing · Senior · Question 12 of 75

What does mutation testing (e.g. Stryker) measure?

✓Correct answer: Whether tests fail when the code is deliberately changed (mutants); surviving mutants reveal weak assertions
2How fast tests run after code changes
3Coverage of DOM mutations

Explanation

It answers what coverage can't: whether the executed code is actually verified. It's expensive, so it's usually run on critical modules.

Further reading

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