Test Coverage Gap Detective
For QA-aware developers and tech leads checking whether a PR has enough meaningful tests for the changed behavior.
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๐ The Prompt
๐ Prompt available in download
Get the full prompt text in a downloadable .txt file. Free, no signup required.
Download PromptVariables to fill in
{{CODE_DIFF}} โ Replace with your input {{TEST_FRAMEWORK}} โ Replace with your input {{CRITICAL_PATHS}} โ Replace with your input {{TEST_RULES}} โ Replace with your input About this prompt
Test Coverage Gap Detective helps teams evaluate whether a pull request is actually protected by meaningful tests. Instead of counting lines or file names, it inspects behavior changes, edge cases, and failure modes to identify missing unit, integration, contract, or regression tests. This makes it much more useful than a simple coverage percentage when code paths change in subtle ways.
The prompt is built for QA-minded developers, engineering managers, and reviewers who want to reduce escaped defects. It highlights untested branches, fragile assumptions, and scenarios that should be covered before merge. The output also recommends the best test type for each gap, so authors know whether they need a lightweight unit test or a broader integration check. Use it to strengthen test coverage without inflating low-value assertions.
Customize by supplying {{CODE_DIFF}}, the test framework in {{TEST_FRAMEWORK}}, and any critical behaviors in {{CRITICAL_PATHS}}. If your team has rules about mocking, fixtures, or snapshot tests, add them in {{TEST_RULES}}. The prompt produces a coverage gap report with missing scenarios, suggested test names, and a severity rating. For larger PRs, run it after a code review so the model can align test recommendations with the actual implementation changes.
Key features
- Detects missing test coverage for behavior changes.
- Recommends unit, integration, or contract tests appropriately.
- Flags fragile assumptions and untested edge cases.
- Supports regression prevention in fast-moving teams.
- Suggests concrete test names and expected assertions.
Best for
- โ QA-focused developers validating PR readiness
- โ Engineering managers reducing escaped defects
- โ Backend teams standardizing tests across services
Tips
- ๐ก Provide your critical user journeys in {{CRITICAL_PATHS}} for stronger prioritization.
- ๐ก Include test conventions in {{TEST_RULES}} to align with your team style.
- ๐ก Use the modelโs suggested test names as a starting point, not a final answer.
What you'll get
A gap analysis listing behaviors that need tests, the risk of leaving them untested, and the best test type for each case. It may suggest names like shouldRejectInvalidToken or shouldRetryOnTimeout. The output ends with a verdict such as needs_more_tests or ready_for_merge, plus a short rationale.
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