# Text Texture Generator - Test Suite Summary

## Overview

Comprehensive test suite for the Text Texture Generator Blender addon, focusing on core text processing and fitting algorithms.

## Test Structure

### Framework Setup

- **pytest** configuration with Blender mocking
- Mock classes for `bpy` module and Blender data structures
- Comprehensive fixtures for common test inputs
- Separate test markers for unit and integration tests

### Files Created

1. `tests/conftest.py` - pytest configuration and shared fixtures
2. `tests/pytest.ini` - pytest settings and markers
3. `tests/fixtures/sample_data.py` - test data and constants
4. `tests/unit/test_text_processor.py` - unit tests for text processing
5. `tests/unit/test_text_fitting.py` - unit tests for text fitting algorithms
6. `tests/integration/test_text_generation_pipeline.py` - integration tests

## Unit Tests Coverage

### Text Processor (`test_text_processor.py`)

- **TestWrapTextToWidth** (5 tests)
  - Empty/whitespace text handling
  - Text that fits within constraints
  - Text requiring wrapping
  - Single word too long edge case
- **TestProcessTextContent** (5 tests)

  - Newline normalization
  - Multiple newline collapsing
  - Mixed whitespace handling
  - Empty string handling
  - No-newline passthrough

- **TestCalculateTextMetrics** (2 tests)

  - Basic metrics calculation
  - Font error handling fallback

- **TestRectanglesOverlap** (5 tests)

  - Non-overlapping rectangles
  - Clear overlaps
  - Edge touching scenarios
  - Identical rectangles
  - Containment cases

- **TestFindNonOverlappingPosition** (3 tests)

  - Finding position with no existing blocks
  - Avoiding existing blocks
  - Fallback when no space available

- **TestValidateTextRendering** (4 tests)

  - Valid positions validation
  - Negative position detection
  - Boundary exceed detection
  - Zero dimension detection

- **TestOptimizeTextLayout** (3 tests)
  - No overlaps optimization
  - Overlap resolution
  - Empty list handling

### Text Fitting (`test_text_fitting.py`)

- **TestLargestRectangleInHistogram** (6 tests)

  - Simple histogram processing
  - Increasing/decreasing patterns
  - Empty histogram edge case
  - Single bar scenarios
  - Zero height handling
  - Pyramid-shaped histograms

- **TestCalculateAvailableTextArea** (4 tests)

  - No overlays scenario
  - Single overlay
  - Multiple overlays
  - Full area coverage

- **TestCalculateTextPosition** (4 tests)

  - Center alignment
  - Top-left alignment
  - Bottom-right alignment
  - Invalid alignment fallback

- **TestFindOptimalFontSize** (3 tests)

  - Basic optimal size finding
  - Font loading error handling
  - Tight constraint scenarios

- **TestCalculateTextScaling** (3 tests)

  - Basic scaling calculation
  - Different width/height ratios
  - Zero dimension handling

- **TestCheckTextOverlap** (5 tests)

  - No overlaps detection
  - Single overlap detection
  - Multiple overlaps
  - Empty/single position edge cases

- **TestResolveTextConflicts** (4 tests)
  - No conflicts scenario
  - Vertical movement resolution
  - Horizontal movement fallback
  - Empty list handling

## Integration Tests Coverage

### Text Generation Pipeline (`test_text_generation_pipeline.py`)

- **TestTextGenerationPipeline** (4 tests)

  - Complete text generation workflow
  - Overlap detection and resolution workflow
  - Text metrics and fitting integration
  - Area calculation and layout optimization

- **TestErrorHandlingIntegration** (2 tests)
  - Font error graceful degradation
  - Text processing chain error handling

## Key Features Tested

### Core Algorithms

✅ Text wrapping and newline normalization
✅ Largest rectangle in histogram algorithm
✅ Text positioning and alignment
✅ Optimal font size calculation
✅ Text scaling calculations
✅ Overlap detection and conflict resolution
✅ Available area calculation with overlays
✅ Layout optimization

### Error Handling

✅ Font loading failures
✅ PIL/Pillow import errors
✅ Invalid input handling
✅ Boundary condition validation
✅ Graceful degradation patterns

### Integration Points

✅ Module interaction workflows
✅ End-to-end text processing pipeline
✅ Error propagation and handling
✅ Mock Blender API integration

## Test Execution

All tests designed to run independently of Blender installation using comprehensive mocking system. Tests can be executed with:

```bash
# Run all tests
cd tests && python -m pytest -v

# Run only unit tests
cd tests && python -m pytest unit/ -v

# Run only integration tests
cd tests && python -m pytest integration/ -v

# Run specific test markers
cd tests && python -m pytest -m unit -v
cd tests && python -m pytest -m integration -v
```

## Coverage Summary

- **66 total test cases** across unit and integration tests
- **Core text processing functions**: 23 tests
- **Text fitting algorithms**: 35 tests
- **Integration workflows**: 6 tests
- **Error handling**: 2 tests

The test suite provides comprehensive coverage of the most critical functionality for text processing and fitting in the Text Texture Generator addon.
