Test Coverage Improvement Expert

Test coverage gaps are uncovered code paths revealed by coverage reports. This Skill analyzes your coverage data, identifies which lines or branches lack tests, prioritizes critical and security-sensitive areas, then generates new tests that follow your project's existing patterns—without touching production code.

Yes. This Skill works with Jest and Vitest projects by parsing their coverage reports, identifying untested paths, and generating tests aligned with your project's conventions. It also supports Foundry and Solidity smart contract testing.

This Skill generates new test cases that target coverage gaps while preserving all production behavior. It adds only tests, verifies they pass, confirms coverage increases, and leaves your implementation code untouched.

Prioritize critical paths and security-sensitive code. This Skill analyzes coverage reports to focus testing effort on high-impact areas first, ensuring your testing effort protects the most important functionality before expanding to lower-risk paths.

This Skill pattern-matches against your existing test suite, studying conventions like naming, structure, and assertion style, then generates new tests that blend seamlessly with your current test codebase.

Yes. After generating tests, the Skill runs coverage reports again to validate that coverage increased and all new tests pass, confirming the improvements are real and no regressions occurred.