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Measuring Test Effectiveness
5.1Are Your Tests Actually Finding Bugs?Having tests is not the same as having effective tests. A test suite with 95% code coverage can still miss critical bugs if the tests are…5.2Code Coverage: What It Measures and What It Doesn'tCode coverage measures which parts of the code are executed when your tests run. It answers the question: "Which lines of code have at…5.3Mutation Testing: The True Measure of Test QualityMutation testing measures test effectiveness by deliberately introducing bugs (mutations) into your code and checking whether your tests…5.4Requirement Coverage and TraceabilityRequirement traceability maps each requirement to the test cases that verify it, creating a traceable chain:5.5Risk Coverage: Are You Testing the Right Things?Code coverage measures how much code is tested. Risk coverage measures whether the most important parts are tested.5.6Test Suite Health MetricsWhy it matters: If the test suite takes too long, developers stop running it, and the feedback loop breaks.5.7Benchmarking Against Industry StandardsThe DORA framework provides industry benchmarks:5.8When Metrics Lie: Goodhart's Law"When a measure becomes a target, it ceases to be a good measure."5.9Hands-On Exercise1. Calculate your project's code coverage. Now review 5 tests in the covered area -- are they genuinely testing behavior or just executing…