Testing · Senior · Question 14 of 75

Why can coverage targets backfire as a KPI?

✓Correct answer: Teams start writing tests that execute code without meaningful assertions just to raise the number (Goodhart's law)
2Coverage tools slow down production
3Coverage can't be measured in TypeScript

Explanation

Use coverage to find untested areas and review them, not as a pass/fail goal for people.

Further reading

Martin Fowler: Test Coverage ↗

Test yourself

Take the Testing · Senior quiz: questions and options are shuffled, and you get a review of your mistakes at the end.