test-coverage-review

name	test-coverage-review
description	Audit test coverage, identify gaps, and recommend local tests plus CI workflows
compatibility	>=3.2

Test Coverage Review

Skill metadata: version "1.0"; license MIT; tags [tests, coverage, ci, review, quality]; compatibility ">=3.2"; recommended tools [codebase, runCommands, githubRepo].

Review the current project's test coverage posture and recommend what to test next, what coverage tooling is missing, and which CI workflows would add the most value.

When to use

• The user asks to "review my tests", "check test coverage", or "what tests should I add"
• The user wants help identifying untested or weakly tested code
• The user wants CI workflow recommendations for coverage and test quality

When NOT to use

• The user already asked for a specific test file to be written
• The task is only to fix a single failing test

Steps

1. Discover the test stack - Detect test runners and coverage tooling from config files, manifests, and CI workflows.

2. Ask for coverage output when available - If a coverage command is configured, ask the user to run it and paste the output. Copilot cannot run the command on the user's machine in chat.

3. Fall back to static analysis when needed - If no coverage tooling exists, scan the repository for source files, test files, and obvious gaps.

4. Identify coverage gaps - Classify gaps into:

   • Zero coverage - no corresponding tests or 0% coverage
   • Low coverage - weak or partial coverage, especially under 50%
   • Missing test types - no integration, edge-case, or error-path coverage

5. Recommend local tests - For each important gap, specify:

   • file or module
   • test type: unit, integration, end-to-end, property-based, or snapshot
   • priority: critical, high, medium, or low
   • a brief description of the behavior or edge case to cover

6. Recommend CI workflows - Suggest copy-ready GitHub Actions improvements when they are justified by the stack, such as:

   • coverage gate
   • coverage diff comments
   • nightly full suite
   • runtime matrix
   • mutation testing
   • contract or API tests

7. Present the report - Use this structure:

   ## Test Coverage Review - <project>
   
   ### Current coverage snapshot
   - framework and runner
   - overall coverage if known
   - test file count and obvious untested areas
   
   ### Well-covered
   - files or modules that appear healthy
   
   ### Partially covered
   - files or modules with notable gaps
   
   ### Untested or near-zero
   - highest-priority missing coverage
   
   ### Recommended local tests
   - file | type | priority | what to cover
   
   ### Recommended CI workflows
   - workflow name and why it helps
   - ready-to-copy YAML when appropriate
   
   ### Notes
   - missing tooling
   - assumptions
   - risk areas
   

8. Wait - Do not write test files, workflow files, or coverage config until the user explicitly asks.

Verify

• Test stack detection is tied to real repository signals
• Coverage output was requested from the user when tooling exists
• Static analysis clearly distinguishes assumptions from measured coverage
• Recommendations are prioritized by user impact and risk
• No tests or workflows were written automatically