Code coverage and its pitfalls
WHAT IT TESTS: understanding coverage as a signal, not a goal. OUTLINE: it measures executed lines, surfaces untested paths, and guides where to add tests. RED FLAG: treating 100 percent as proof of correctness or writing assertion-free tests just to inflate…
WHAT IT TESTS: whether you treat coverage as a diagnostic rather than a target. ANSWER OUTLINE: code coverage reports which lines and branches your test suite executed, helping you find untested error paths and dead code; use it to prioritize meaningful tests on risky logic. The pitfall is Goodhart's law: a high percentage only proves code ran, not that it was asserted correctly, and chasing the number invites tests without assertions, brittle tests, or coverage of trivial getters while real edge cases stay untested.
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- #ios
- #testing
- #code-coverage
- #quality
- #xcode
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