# Test-Driven Development Plan for EasyPPTX

This document outlines the test-driven development approach for implementing and refining the EasyPPTX library.

## TDD Process

For each component of the EasyPPTX library, we will follow these steps:

1. **Write Tests**: Create tests that define the expected behavior of a component
2. **Run Tests**: Confirm that the tests fail (since the functionality isn't fully implemented yet)
3. **Implement Code**: Write the minimum code necessary to pass the tests
4. **Run Tests Again**: Verify that the tests now pass
5. **Refactor**: Clean up the code while ensuring tests continue to pass
6. **Document**: Update documentation and implementation status

## Testing Approach

### Unit Tests

Each module will have corresponding unit tests that verify:

- Individual function behavior
- Error handling
- Edge cases
- Parameter validation

### Integration Tests

Integration tests will verify:

- Component interactions
- End-to-end workflows
- Real-world usage scenarios

## Test Cases by Module

### Presentation Module

- Creation of new presentations
- Opening existing presentations
- Adding slides
- Accessing slide collections
- Saving presentations
- Error handling for file operations

### Slide Module

- Adding text elements
- Adding image elements
- Getting and setting slide properties
- Slide manipulation operations
- Shape management

### Text Module

- Adding different types of text (title, paragraphs)
- Text formatting (font size, bold, italic, color)
- Text positioning
- Multi-paragraph handling

### Image Module

- Adding images with different parameters
- Image sizing and positioning
- Aspect ratio maintenance
- Error handling for missing images
- Image dimension calculations

### Table Module

- Creating tables from data arrays
- Table formatting and styling
- Creating tables from pandas DataFrames
- Cell formatting
- Header row handling

### Chart Module

- Creating different chart types
- Chart from raw data
- Chart from pandas DataFrames
- Chart formatting and customization
- Legend and title handling

## Implementation Schedule

1. **Phase 1**: Core functionality tests and implementation
   - Presentation and Slide modules

2. **Phase 2**: Basic content tests and implementation
   - Text and Image modules

3. **Phase 3**: Advanced content tests and implementation
   - Table and Chart modules

4. **Phase 4**: Integration tests and refinement
   - Cross-module functionality
   - Example workflows

5. **Phase 5**: Performance optimization and advanced features
   - Based on test feedback and usage patterns

## Success Criteria

- All unit tests pass (100% success rate)
- Code coverage of at least 90%
- All public API functions have corresponding tests
- Documentation matches implemented functionality
- Example scripts run without errors
- No regressions introduced during development
