test-coverage-analysis
Test coverage analysis, gap identification, and coverage configuration for Python and JavaScript. PROACTIVELY activate for: (1) Analyzing coverage reports, (2) Identifying critical coverage gaps, (3) Configuring coverage tools, (4) Setting up CI/CD coverage checks, (5) Branch coverage analysis. Triggers: "coverage", "uncovered", "pytest-cov", "istanbul", "c8", "coverage report", "coverage gap"
What this skill does
# Test Coverage Analysis Skill
## Metadata (Tier 1)
**Keywords**: coverage, uncovered, pytest-cov, istanbul, c8, coverage report
**File Patterns**: coverage.xml, lcov.info, coverage.json
**Modes**: testing_frontend, testing_backend
---
## Instructions (Tier 2)
### Python Coverage (coverage.py)
```bash
# Generate coverage
pytest --cov=src --cov-report=html --cov-report=term
# Configuration
[tool.coverage.run]
source = ["src"]
branch = true # Enable branch coverage
omit = ["*/tests/*", "*/__pycache__/*"]
[tool.coverage.report]
fail_under = 80
show_missing = true
```
### JavaScript/TypeScript Coverage
```bash
# Jest
npm test -- --coverage
# Vitest
vitest --coverage
# Configuration (vitest.config.ts)
export default defineConfig({
test: {
coverage: {
provider: 'v8',
reporter: ['text', 'json', 'html'],
thresholds: {
lines: 70,
branches: 70,
functions: 70,
statements: 70
}
}
}
});
```
### Coverage Gap Analysis
**Critical Gaps** (must cover):
1. Error handlers (try/except, catch blocks)
2. Boundary conditions (null, empty, max values)
3. Complex conditionals (nested if/else)
4. Security-sensitive code
**Example Gap Analysis**:
```
File: src/auth.py
Coverage: 45%
Uncovered Lines:
- 45-52: Password reset token generation (CRITICAL)
- 78-85: Email sending error handler (HIGH)
- 120-125: Edge case: empty email (MEDIUM)
Priority: Fix CRITICAL gaps first
```
### Branch Coverage
```python
def process(value):
if value > 0:
return "positive" # Branch 1
else:
return "non-positive" # Branch 2
# Need 2 tests to cover both branches
test_process_positive() # Covers branch 1
test_process_zero() # Covers branch 2
```
### Coverage in CI/CD
```yaml
# GitHub Actions
- name: Test with coverage
run: pytest --cov=src --cov-report=json
- name: Check threshold
run: |
python scripts/coverage_validator.py
```
### Anti-Patterns
- Chasing 100% coverage without quality tests
- Ignoring branch coverage (only line coverage)
- Not testing error paths
- Excluding important files from coverage
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