Test Coverage Improver

The test-coverage-improver skill automatically analyzes codebases to identify untested areas and generates targeted unit tests to increase coverage metrics. It integrates directly with development workflows to ensure new features are validated before merging.

When to use it

• Pre-commit safety: Run the agent before pushing code to catch missing edge cases in logic branches.
• Legacy modernization: Generate test suites for older codebases that lack automated validation.
• CI/CD optimization: Integrate into pipelines to automatically boost coverage thresholds without manual effort.
• Regression prevention: Quickly add tests after refactoring existing functions to ensure behavior remains consistent.

Key capabilities

• Scans source files to detect gaps in current test suites.
• Writes executable unit tests tailored to specific language syntax.
• Focuses on increasing percentage coverage of the codebase.

Example prompts

• "Analyze my src/utils directory and write unit tests for any functions currently lacking coverage."
• "Generate a comprehensive test suite for this new API endpoint to ensure 100% logic coverage."
• "Identify complex conditional blocks in my codebase that are not covered by existing tests and create scenarios to validate them."

Tips & gotchas

Ensure your project has a supported testing framework installed (e.g., Jest, PyTest) before running the agent, as it generates code compatible with standard setups. While effective for increasing coverage numbers, always manually review generated tests to ensure they align with actual business logic requirements.