Coverage Is A Map, Not A Grade
Interpret code coverage as a discovery signal rather than a guarantee of test quality.
The move: use the coverage report as a risk scanner. High coverage can be comforting and misleading at the same time. A line can be covered by a test that never checks the result, checks a copy of the production algorithm, or uses only the easiest input. Coverage is still useful because it reveals blind spots. The mistake is treating the number as the outcome. A healthier coverage conversation asks three questions. What important behavior has no test at all? What risky branch is visited but weakly asserted? What low-risk code would cost more to test than it protects? These…
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