Initial: Claude config with agents, skills, commands, rules and scripts

commands/test-coverage.md

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+# Test Coverage
+
+Analyze test coverage, identify gaps, and generate missing tests to reach 80%+ coverage.
+
+## Step 1: Detect Test Framework
+
+| Indicator | Coverage Command |
+|-----------|-----------------|
+| `jest.config.*` or `package.json` jest | `npx jest --coverage --coverageReporters=json-summary` |
+| `vitest.config.*` | `npx vitest run --coverage` |
+| `pytest.ini` / `pyproject.toml` pytest | `pytest --cov=src --cov-report=json` |
+| `Cargo.toml` | `cargo llvm-cov --json` |
+| `pom.xml` with JaCoCo | `mvn test jacoco:report` |
+| `go.mod` | `go test -coverprofile=coverage.out ./...` |
+
+## Step 2: Analyze Coverage Report
+
+1. Run the coverage command
+2. Parse the output (JSON summary or terminal output)
+3. List files **below 80% coverage**, sorted worst-first
+4. For each under-covered file, identify:
+   - Untested functions or methods
+   - Missing branch coverage (if/else, switch, error paths)
+   - Dead code that inflates the denominator
+
+## Step 3: Generate Missing Tests
+
+For each under-covered file, generate tests following this priority:
+
+1. **Happy path** — Core functionality with valid inputs
+2. **Error handling** — Invalid inputs, missing data, network failures
+3. **Edge cases** — Empty arrays, null/undefined, boundary values (0, -1, MAX_INT)
+4. **Branch coverage** — Each if/else, switch case, ternary
+
+### Test Generation Rules
+
+- Place tests adjacent to source: `foo.ts` → `foo.test.ts` (or project convention)
+- Use existing test patterns from the project (import style, assertion library, mocking approach)
+- Mock external dependencies (database, APIs, file system)
+- Each test should be independent — no shared mutable state between tests
+- Name tests descriptively: `test_create_user_with_duplicate_email_returns_409`
+
+## Step 4: Verify
+
+1. Run the full test suite — all tests must pass
+2. Re-run coverage — verify improvement
+3. If still below 80%, repeat Step 3 for remaining gaps
+
+## Step 5: Report
+
+Show before/after comparison:
+
+```
+Coverage Report
+──────────────────────────────
+File                   Before  After
+src/services/auth.ts   45%     88%
+src/utils/validation.ts 32%    82%
+──────────────────────────────
+Overall:               67%     84%  ✅
+```
+
+## Focus Areas
+
+- Functions with complex branching (high cyclomatic complexity)
+- Error handlers and catch blocks
+- Utility functions used across the codebase
+- API endpoint handlers (request → response flow)
+- Edge cases: null, undefined, empty string, empty array, zero, negative numbers