Testing · Junior · Question 12 of 78

Is 100% coverage a good goal on its own?

✓Correct answer: No: it is expensive and doesn't guarantee meaningful checks; cover important behaviour first
2Yes: below 100% the code can't be released
3Yes: 100% coverage means there are no bugs

Explanation

Martin Fowler: coverage is useful for finding untested code, but a poor target. High coverage with weak assertions gives false confidence.

Further reading

Martin Fowler: Test Coverage ↗

Test yourself

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