claudekit/reports/testing/AUTOMATED_TEST_COVERAGE_embedded-hooks.md

CLI tools for Claude Code development workflow

# Automated Test Coverage - Embedded Hooks System

Date: 2025-07-31
Generated by: Claude Code Assistant

## Overview
Analysis of automated test coverage for the claudekit-hooks TypeScript implementation.

## Test Structure

### Unit Tests

#### 1. Base Infrastructure (`tests/hooks/unit/base.test.ts`)
- ✅ BaseHook abstract class functionality
- ✅ Infinite loop prevention (stop_hook_active)
- ✅ File path extraction from payload
- ✅ Context creation with project root and package manager
- ✅ Configuration handling
- ✅ Utility methods (progress, success, warning, error output)
- ✅ File operations (fileExists, readFile, shouldSkipFile)
- ✅ Command execution wrapper

#### 2. Hook Runner (`tests/hooks/unit/runner.test.ts`)
- ✅ HookRunner initialization with config paths
- ✅ Hook registration system
- ✅ Unknown hook error handling
- ✅ Stdin payload reading and JSON parsing
- ✅ Configuration file loading
- ✅ JSON response handling
- ✅ Exit code propagation
- ✅ Integration scenarios with actual hooks

#### 3. Utilities (`tests/hooks/unit/utils.test.ts`)
- ✅ readStdin function
- ✅ findProjectRoot with git integration
- ✅ detectPackageManager (npm, yarn, pnpm)
- ✅ execCommand with timeout and error handling
- ✅ formatError for consistent error messages
- ✅ checkToolAvailable for dependency checking

### Integration Tests (`tests/hooks/integration.test.ts`)
- ✅ Complete hook execution flow
- ✅ Stdin/stdout communication
- ✅ Exit code verification
- ✅ Configuration loading
- ✅ Claude Code payload parsing
- ✅ Real file system operations

## Hook-Specific Test Coverage

### Individual Hook Tests
Based on the codebase analysis, individual hook implementations **do not have dedicated unit tests**. The hooks are tested through:

1. **Integration tests** - Via the HookRunner integration scenarios
2. **Manual testing** - Documented in MANUAL_TEST_RESULTS_embedded-hooks.md
3. **Base class tests** - Common functionality tested via BaseHook tests

### Missing Hook-Specific Tests
The following hooks lack dedicated unit tests:
- ❌ `typecheck.ts` - No unit tests for TypeScript validation logic
- ❌ `eslint.ts` - No unit tests for ESLint execution logic
- ❌ `no-any.ts` - No unit tests for 'any' type detection patterns
- ❌ `auto-checkpoint.ts` - No unit tests for git stash logic
- ❌ `validate-todo.ts` - No unit tests for todo parsing logic
- ❌ `project-validation.ts` - No unit tests for multi-tool validation
- ❌ `run-related-tests.ts` - No unit tests for test file discovery

## Test Statistics

### Coverage Summary
- **Base Infrastructure**: Well tested (30+ tests)
- **Hook Runner**: Comprehensive coverage (22+ tests)
- **Utilities**: Good coverage (15+ tests)
- **Individual Hooks**: No dedicated unit tests (0 tests)

### Total Tests
- Unit tests for hooks infrastructure: ~67 tests
- Integration tests: Framework in place
- Hook-specific unit tests: 0 tests

## Recommendations

### High Priority
1. **Add unit tests for each hook implementation**
   - Test the execute() method logic
   - Mock external dependencies (git, npm, etc.)
   - Test error conditions and edge cases
   - Verify output formatting

2. **Example test structure for hooks**:
```typescript
// cli/hooks/typecheck.test.ts
describe('TypecheckHook', () => {
  it('should skip non-TypeScript files');
  it('should detect TypeScript errors');
  it('should handle missing tsconfig.json');
  it('should respect timeout configuration');
});
```

### Medium Priority
3. **Add end-to-end tests**
   - Test hooks with real Claude Code payloads
   - Verify integration with settings.json matchers
   - Test hook chaining and dependencies

4. **Add performance tests**
   - Measure hook execution time
   - Test with large codebases
   - Verify timeout handling

### Low Priority
5. **Add mutation tests**
   - Verify test quality
   - Ensure edge cases are covered

## Conclusion

While the infrastructure for the hooks system is well-tested, the individual hook implementations lack dedicated unit tests. The system relies on:
- Strong base class testing
- Integration test framework
- Manual testing for verification

To improve confidence in the system, unit tests should be added for each hook implementation to verify their specific business logic.