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quality-coverage-report

Testing & Quality
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Generate test coverage reports showing which code paths are tested. Use to identify untested code and improve test coverage.

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/data/quality-coverage-report/SKILL.md

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Test Coverage Report Skill

Generate and analyze test coverage reports.

When to Use

  • After running tests
  • Before creating PR
  • Identifying untested code
  • Improving test coverage

Quick Reference

# Python coverage
pytest --cov=src --cov-report=html tests/

# View report
open htmlcov/index.html

# Terminal report
pytest --cov=src --cov-report=term-missing tests/

Coverage Metrics

Line Coverage

Percentage of code lines executed by tests:

src/module.mojo
  Lines: 45/50 (90%)
  Missing: 12, 18, 23, 35, 41

Branch Coverage

Percentage of decision branches taken:

Branches: 8/10 (80%)
Missing branches: line 12->15, line 18->20

Coverage Goals

CategoryMinimumTargetCritical
Line coverage80%90%100%
Branch coverage70%85%95%
Critical paths--100%

Coverage Report

Coverage Report
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
File                Lines    Missing    Coverage
────────────────────────────────────────────────
src/tensor.mojo       150         5      96.7%
src/nn.mojo          200        30      85.0%
src/utils.mojo        50        10      80.0%
────────────────────────────────────────────────
TOTAL                400        45      88.8%

Minimum coverage: 80% ✅
Target coverage: 90% ❌
Critical paths: 100% ✅

Improving Coverage

  1. Identify gaps - Find uncovered lines in report
  2. Write tests - Add tests for untested code
  3. Re-run - Generate new report
  4. Verify - Check coverage improved
  5. Repeat - Until targets met

Coverage Workflow

# 1. Run tests with coverage
pytest --cov=src --cov-report=html --cov-report=term-missing tests/

# 2. Identify missing coverage
# Review "Missing" column in output

# 3. Write tests for gaps
# ... create test files ...

# 4. Re-run
pytest --cov=src --cov-report=html tests/

# 5. Check improvement
# Compare htmlcov/index.html

CI Integration

- name: Test Coverage
  run: |
    pytest --cov=src --cov-report=xml
    codecov -f coverage.xml

Error Handling

ErrorFix
"No module named pytest"Install: pip install pytest-cov
"Cannot find tests/"Verify test directory exists
No coverage reportEnsure tests ran successfully

References