Code coverage analyzers measure which parts of the source code are exercised during test execution. They can report statement coverage, branch coverage, condition coverage, path coverage, or other structural coverage measures. In software quality engineering, this information helps determine whether the test cases are effective at exercising implemented code. If important statements, decisions, or branches are not executed, the test set may need to be improved. Coverage analysis does not prove that requirements are complete, because requirements may be missing before code is written. It also does not establish design traceability unless linked to other lifecycle artifacts. Code cohesion describes how strongly related a module’s internal responsibilities are. Therefore, coverage analyzers are most useful for evaluating test case effectiveness.

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