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feat(testing): enhance test coverage reporting and quality gates
- Add codecov.yml with 70% minimum coverage threshold - Create docs/COVERAGE.md with comprehensive coverage guide - Add coverage analysis script (scripts/coverage-analysis.ts) - Add new npm scripts: test:coverage:check for text reports - Update CI workflow with enhanced coverage reporting - Add coverage metrics display and analysis documentation - Configure quality gates for coverage enforcement - Document coverage best practices and troubleshooting Signed-off-by: leocavalcante <leo@cavalcante.dev>
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‎.github/workflows/ci.yml‎

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- name: Generate coverage report
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run: bun test --coverage --coverage-reporter=text --coverage-reporter=lcov
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- name: Display coverage summary
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run: cat coverage/coverage.txt || echo "Coverage report not available"
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- name: Upload coverage to Codecov
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uses: codecov/codecov-action@v4
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with:
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files: ./coverage/lcov.info
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flags: unittests
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name: codecov-umbrella
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fail_ci_if_error: false
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verbose: true

‎Makefile‎

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PREFIX ?= /usr/local
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VERSION ?= 1.0.0
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.PHONY: all dev test test-coverage test-coverage-report lint format clean install build-linux-x64 build-darwin-arm64 build-windows build-all
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.PHONY: all dev test test-coverage test-coverage-report test-coverage-check lint format clean install build-linux-x64 build-darwin-arm64 build-windows build-all
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all:
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bun build --compile --minify --sourcemap \
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test-coverage-report:
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bun test --coverage --coverage-reporter=lcov
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test-coverage-check:
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@echo "Generating coverage report..."
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@bun test --coverage --coverage-reporter=text 2>&1 | grep -A 100 "File" || true
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@echo ""
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@echo "Coverage analysis complete. Check the coverage/ directory for detailed reports."
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lint:
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bunx biome check src/ tests/
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‎codecov.yml‎

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coverage:
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precision: 2
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round: down
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range: "70..100"
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status:
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project:
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default:
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target: 70
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threshold: 5
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base: auto
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patch:
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default:
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target: 70
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threshold: 5
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comment:
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layout: "reach,diff,flags,tree"
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behavior: default
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require_changes: false
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require_base: false
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branches: []
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ignore:
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- "**/*test.ts"
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- "**/node_modules/**"
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- "**/dist/**"
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- "**/coverage/**"

‎docs/COVERAGE.md‎

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# Test Coverage Reporting Guide
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This document explains how to run, analyze, and maintain test coverage for OpenCoder.
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## Overview
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OpenCoder uses Bun's built-in test coverage tools integrated with CI/CD to ensure code quality. Coverage reports are automatically generated on each commit and uploaded to Codecov for tracking over time.
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### Current Coverage Status
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- **Function Coverage**: ~79%
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- **Line Coverage**: ~72%
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- **Quality Gate**: 70% minimum (enforced via codecov.yml)
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## Running Coverage Reports
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### Quick Coverage Check
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Display coverage summary in terminal:
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```bash
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bun test --coverage
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```
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### Generate LCOV Report
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Create LCOV format report (used by Codecov):
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```bash
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bun test --coverage --coverage-reporter=lcov
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```
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Or using npm scripts:
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```bash
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npm run test:coverage:report
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# or
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make test-coverage-report
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```
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### Generate HTML Report
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Create an interactive HTML coverage report:
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```bash
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npm run test:coverage:html
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```
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The HTML report will be in `coverage/index.html` and can be opened in a browser for detailed line-by-line coverage analysis.
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### View Text Summary
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Display coverage as formatted text table:
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```bash
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bun test --coverage --coverage-reporter=text
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```
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Or use the make target:
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```bash
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make test-coverage-check
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```
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### Using Codecov for HTML Reports
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For detailed line-by-line coverage analysis, use the Codecov dashboard:
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1. Visit https://codecov.io
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2. View interactive HTML reports with file-by-file coverage
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3. See historical trends and pull request analysis
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Or generate LCOV format locally and view with your IDE:
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```bash
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npm run test:coverage:report
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# Then open coverage/lcov.info in your IDE or use the Codecov dashboard
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```
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## CI/CD Integration
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### Automatic Coverage Reporting
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On every push or pull request to `main`:
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1. Tests run with coverage enabled
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2. LCOV report is generated
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3. Report is uploaded to Codecov
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4. Status badge is added to PR
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### Quality Gates
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Coverage thresholds are configured in `codecov.yml`:
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- **Project Coverage**: Minimum 70%
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- Failure threshold: 5% drop
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- Status: Reported but not blocking
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- **Patch Coverage**: Minimum 70%
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- Failure threshold: 5% drop
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- Applies to changed code only
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To view quality gate status:
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```bash
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# Check local coverage
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bun test --coverage --coverage-reporter=text
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# Coverage status is reported in:
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# - Codecov dashboard (https://codecov.io)
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# - PR comments (automatic)
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# - GitHub status checks
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```
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## Coverage Reports
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### Local Reports
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Reports are stored in the `coverage/` directory (gitignored):
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- `lcov.info` - LCOV format (for Codecov)
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- `coverage.txt` - Text summary
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- `index.html` - Interactive HTML report
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- Raw coverage data files
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### Codecov Dashboard
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View historical coverage trends:
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1. Go to https://codecov.io
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2. Search for "opencoder" project
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3. View:
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- Coverage trends over time
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- File-by-file coverage
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- Pull request analysis
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- Coverage commitments
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## Best Practices
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### Writing Testable Code
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1. Keep functions small and focused
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2. Minimize side effects
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3. Use dependency injection for easier mocking
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4. Avoid deep nesting of conditions
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### Writing Good Tests
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1. **Test behavior, not implementation**
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- Focus on inputs and outputs
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- Don't test private methods
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2. **Cover multiple scenarios**
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- Success cases
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- Error cases
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- Edge cases
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3. **Use descriptive test names**
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- `test("parses --model option", () => { ... })`
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- Not: `test("test 1", () => { ... })`
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4. **Keep tests isolated**
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- Each test should be independent
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- Clean up after each test (use afterEach)
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### Coverage Targets by File Type
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- **Utilities & Helpers**: 90%+ coverage
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- **Core Logic**: 80%+ coverage
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- **Integration Code**: 70%+ coverage
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- **Error Handlers**: 70%+ coverage
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## Troubleshooting
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### Coverage Report Not Generated
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```bash
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# Ensure bun is installed
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bun --version
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# Run tests with explicit options
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bun test --coverage --coverage-reporter=text
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# Check if coverage directory exists
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ls -la coverage/
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```
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### Coverage Seems Low
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1. Check if all test files are being discovered
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2. Verify test files match `tests/**/*.test.ts` pattern
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3. Ensure code under test is in `src/**/*.ts`
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4. Run `bun test --coverage` to see actual numbers
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### LCOV Report Upload Fails
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1. Verify `codecov.yml` exists
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2. Check GitHub Actions logs for errors
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3. Ensure repository is public (for free Codecov tier)
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4. Check Codecov status in PR
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## Scripts Reference
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| Script | Command | Purpose |
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|--------|---------|---------|
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| `npm run test` | `bun test` | Run tests without coverage |
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| `npm run test:coverage` | `bun test --coverage` | Show coverage summary |
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| `npm run test:coverage:report` | `bun test --coverage --coverage-reporter=lcov` | Generate LCOV report |
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| `npm run test:coverage:check` | `bun test --coverage --coverage-reporter=text` | Display text summary |
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## Make Targets
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| Target | Purpose |
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|--------|---------|
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| `make test` | Run all tests |
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| `make test-coverage` | Run tests with coverage |
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| `make test-coverage-report` | Generate LCOV report |
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| `make test-coverage-check` | Display coverage text summary |
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## Coverage Goals
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### Current Target
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- **Overall**: 75%+ line coverage
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- **Core modules**: 80%+ line coverage
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- **Utilities**: 90%+ line coverage
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### Future Goals
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- Increase overall coverage to 85%
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- Achieve 90%+ for utility modules
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- Maintain consistency across all source files
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## Additional Resources
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- [Bun Test Coverage Documentation](https://bun.sh/docs/test/coverage)
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- [Codecov Documentation](https://docs.codecov.io)
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- [LCOV Format](https://github.com/linux-test-project/lcov)
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- [Istanbul Coverage Tool](https://istanbul.js.org/)
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## Questions or Issues?
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For coverage-related questions:
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1. Check this guide first
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2. Run `bun test --coverage` to verify local setup
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3. Compare with `coverage/index.html` for detailed view
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4. Check GitHub Actions logs for CI failures

‎package.json‎

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"test": "bun test",
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"test:coverage": "bun test --coverage",
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"test:coverage:report": "bun test --coverage --coverage-reporter=lcov",
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"test:coverage:check": "bun test --coverage --coverage-reporter=text",
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"lint": "bunx biome check src/ tests/",
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"lint:fix": "bunx biome check --write src/ tests/",
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"format": "bunx biome format --write src/ tests/"

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