js-partial-classes/test/README.md

A utility package for supplementing main classes with methods from partial classes, supporting both static and instance methods.

# Test Suite Documentation

This directory contains comprehensive tests for the `js-partial-classes` library.

## Test Structure

### Test Files

1. **`basic.test.js`** - Basic functionality tests
   - Tests static initialization with supplement
   - Tests iterateDescriptors function
   - Simple integration tests

2. **`supplement.test.js`** - Comprehensive supplement function tests
   - Direct class reference supplementation
   - String path import supplementation
   - Promise import supplementation
   - Method override behavior
   - Constructor exclusion
   - Non-writable properties handling

3. **`supplementAll.test.js`** - Directory-based supplementation tests
   - JavaScript file (.js) support
   - TypeScript file (.ts) support
   - ES Module file (.mjs) support
   - CommonJS file (.cjs) support
   - Mixed file types
   - Non-supported files
   - Empty directory handling
   - Invalid directory handling

4. **`iterateDescriptors.test.js`** - Utility function tests
   - Static methods iteration
   - Instance methods iteration
   - Constructor exclusion
   - Empty class handling
   - Properties vs methods
   - Non-writable properties
   - Callback functionality
   - Descriptor structure
   - Error handling

5. **`run-all-tests.js`** - Main test runner
   - Executes all test suites
   - Provides comprehensive summary
   - Reports success/failure statistics

### Test Utilities

- **`test-partial.js`** - Test partial class used by basic tests

## Running Tests

### All Tests
```bash
npm test
```

### Individual Test Suites
```bash
npm run test:basic
npm run test:supplement
npm run test:supplementAll
npm run test:iterateDescriptors
```

## Test Results Summary

Based on the latest test run:

### ✅ Working Features
- Basic supplement functionality with direct class references
- Static and instance method supplementation
- Constructor exclusion
- Error handling for null/undefined inputs
- Descriptor structure validation

### ⚠️ Issues Found
1. **Static Initialization**: The static initialization block in classes doesn't work as expected in the test environment
2. **Path Resolution**: Dynamic imports with relative paths need better handling
3. **Descriptor Filtering**: The iterateDescriptors function needs refinement for better property filtering

### 🔧 Fixes Applied
1. **Import Issues**: Fixed missing iterateDescriptors function definition
2. **Async Handling**: Added proper await for supplement calls in supplementAll
3. **Path Resolution**: Improved relative path handling for dynamic imports

## Test Coverage

The test suite covers:

- ✅ **Functionality**: All main functions (supplement, supplementAll, iterateDescriptors)
- ✅ **File Extensions**: .js, .ts, .mjs, .cjs support
- ✅ **Module Systems**: ES modules, CommonJS, TypeScript
- ✅ **Error Handling**: Invalid inputs, missing files, etc.
- ✅ **Edge Cases**: Empty classes, non-writable properties, etc.

## Continuous Integration

The test suite is designed to be run in CI/CD environments and provides:
- Clear pass/fail indicators
- Detailed error messages
- Comprehensive test summaries
- Exit codes for automation

## Contributing

When adding new features, please:
1. Add corresponding tests
2. Update this documentation
3. Ensure all tests pass
4. Follow the existing test patterns