Test Coverage

You might say

Do not only report “90% coverage”; also show whether the high-risk path combining payment failure and a coupon was actually tested.

Test coverage measures how much of requirements, code structure, or risk paths have been reached by tests.Branch coverage can show whether the coupon-plus-payment-failure combination was reached; a requirements matrix can show a missing payment case. Coverage finds untouched paths. It does not mean no defect or meaningful assertions, even at 100%.

Know first

Unit Test

Test CoverageCode CoverageCoverage

How a payment map shows tested and untested risky branches

Checkout decision pathsGreen = exercised by a test

Submit order

Payment succeedsConfirmation

Payment failsRestore cart

Coverage is useful when it reveals unexercised risky paths, not when it is only a percentage.

What to inspect beyond the coverage number

Coverage shows reach, not reliable outcome: A code line or branch executed only means a test passed through it. Without checking the right result or modeling a real risk, a high number cannot prove payment behavior is right.

Fill untested high-risk paths first: Inspect real risks such as coupon combinations, payment failure, and insufficient permission rather than pursuing one global percentage. A map of tested and untested requirements guides action better than a number alone.

You can say this to an AI Agent

Report payment-flow coverage, not only a percentage: list whether success, payment failure, coupon combination, and insufficient permission are tested. Prioritize untested high-risk branches and verify each user-visible result.

Learn next

1Regression Test→2Test Case→

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A report says 100% code coverage, but the page still says “order succeeded” when payment fails. What is the best conclusion?

A. Confirm the failure branch runs, then run it more often to reinforce the 100% coverage numberB. Keep the current coverage and record this error as a separate manual check without changing automated testsC. Check whether the failure branch asserts page state, then add an observable result for failed payment