name: test-coverage description: Analyze test coverage and generate a detailed coverage report

Test Coverage Report Skill

This skill analyzes test coverage for the codebase and generates a detailed report.

Instructions

When this skill is invoked, you should:

1. Parse the coverage data if it exists:

   • If it does not exist, run tests first
   • If it still does not exist, do not proceed further
   • Read the coverage file: coverage/lcov-buttercup.info
   • Parse LCOV format to extract:
     • Lines with execution counts (DA:line_number,count)
     • Total lines and covered lines
     • Coverage percentage

2. Identify covered code sections:

   • Find which line ranges are covered (count > 0)
   • Group consecutive covered lines into ranges
   • Read the source file to identify which functions are covered

3. Generate a comprehensive report including:

   • Test execution summary (pass/fail count, execution time)
   • Overall coverage statistics (lines covered, percentage)
   • List of tested functions with their line ranges
   • List of untested functions
   • Coverage trend if previous coverage data is available
   • Recommendations for next testing priorities

4. Format the output with:

   • Clear sections and headers
   • Tables for statistics
   • Easy-to-read formatting using markdown

Coverage Calculation Formula

Coverage % = (Lines with count > 0) / (Total lines) * 100

Example Output Format

## Test Coverage Report

### Test Execution
- ✅ All X tests passed
- Execution time: Y ms

### Coverage Statistics
- Lines covered: X/Y (Z%)
- Previous coverage: A/B (C%)
- Change: +D lines (+E%)

### Tested Functions
1. function-name (lines X-Y) - Z lines covered
2. another-function (lines A-B) - C lines covered

### Coverage Gaps
- untested-function (lines X-Y) - D lines
- another-untested (lines A-B) - E lines

### Recommendations
The next most valuable functions to test are:
...

Notes

• Always verify the coverage directory exists before attempting to read it
• Handle missing or malformed coverage data gracefully
• Provide actionable recommendations based on function importance and coverage impact