Test Coverage
Test Coverage shows which code, needs, states, or risks tests check. A percentage is only one rough sign.
Another example
A team has 92% line coverage. It still adds authorization tests because that missing risk matters more.
Main parts
- 01Code or behavior under test
- 02Observable evidence
- 03Coverage, failure, and recovery
Use it when
Use reports to find missed areas and discuss risk. Also check mutations, requirements, and production facts.
Do not use it when
Do not treat a target percentage as quality. Avoid empty checks and unreviewed exclusions.
Name used in code
line / branch / function / mutation coverage Before you ship
Check the environment and prepared test data (fixture). Define a result you can observe, failure and edge cases, isolation, stable inputs, useful error details, and cleanup. Set a time budget, owner, and flaky-test rule.
Outcome: Use Test Coverage to gather repeatable evidence about this behavior or quality risk. User context: A team has 92% line coverage. It still adds authorization tests because that missing risk matters more. Validation approach: Test Coverage. Why it fits: Use reports to find missed areas and discuss risk. Also check mutations, requirements, and production facts. Do not use it when: Do not treat a target percentage as quality. Avoid empty checks and unreviewed exclusions. Test requirements: Name the system and test environment. Define prepared test data, other inputs, and the result you can observe. Include failure and edge cases, allowed error, isolation, and cleanup. Test operations: Make failures easy to diagnose. Control random or changing inputs. Name an owner. Keep the test fast and simple enough for its release gate. Acceptance criteria: The test fails for the known bug and passes after the fix. It repeats in the target environment, gives useful evidence, and does not expose or change unrelated data. Evidence and limits (evidence boundary): No single official standard controls the whole term. Its meaning may change across teams, platforms, or frameworks. Unknowns to confirm: Release gate, environment, prepared test data, allowed error, time budget, owner, and flaky-test rule.
Check this request
Review the current use of Test Coverage. Definition: Test Coverage shows which code, needs, states, or risks tests check. A percentage is only one rough sign. Release checks: Check the environment and prepared test data (fixture). Define a result you can observe, failure and edge cases, isolation, stable inputs, useful error details, and cleanup. Set a time budget, owner, and flaky-test rule. Before changing code, report the evidence you found, gaps, severity, and the smallest safe fix.