Test project animations

ANIMATION_TEST_REPORT.md

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+# Animation Test Report - Manim Project
+
+**Generated:** 2025-10-11  
+**Branch:** cursor/test-project-animations-3e34  
+**Status:** Documentation Complete
+
+## Overview
+
+This report documents the comprehensive animation test suite for the Manim animation engine. Due to missing system dependencies in the test environment (pangocairo, cairo, etc.), tests could not be executed, but all test files have been reviewed and documented.
+
+## Test Structure
+
+The animation tests are organized into three main categories:
+
+### 1. Unit Tests (`tests/module/animation/`)
+
+Located in `tests/module/animation/`, these tests verify core animation functionality without rendering:
+
+#### `test_animation.py` - Core Animation Validation
+- **Test Zero Run Time**: Validates that animations cannot have zero total run time
+- **Test Single Animation Zero Run Time**: Allows zero run time for individual animations when others have positive run time
+- **Test Negative Run Time**: Ensures negative run times raise ValueError
+- **Test Frame Rate Validation**: Warns when animation run time is shorter than frame rate
+- **Test Wait Duration**: Validates wait(), pause(), and wait_until() duration parameters
+
+#### `test_animate.py` - Animation Builder Tests
+- **Simple Animate**: Tests basic `.animate.scale()` transformation
+- **Chained Animate**: Validates chaining multiple transformations (`.animate.scale().shift()`)
+- **Overridden Animate**: Tests `@override_animate` decorator functionality
+- **Chaining Overridden Animate**: Ensures proper error handling for chained overridden animations
+- **Animate with Args**: Tests passing animation arguments like `run_time`
+- **Args Placement Validation**: Ensures animation arguments are placed correctly in call chain
+
+#### `test_composition.py` - Animation Composition
+- **Succession Timing**: Tests sequential animation timing in `Succession`
+- **Nested Succession Timing**: Validates timing of nested succession animations
+- **Timescaled Succession**: Tests run time scaling for succession animations
+- **AnimationBuilder in Group**: Validates `.animate` syntax in `AnimationGroup` and `Succession`
+- **AnimationGroup with Wait**: Tests `Wait` animation integration in groups
+- **Remover Propagation**: Ensures `remover` parameter propagates through animation groups
+- **Finish Call**: Validates that `finish()` method is called on all animations
+- **Empty Animation Validation**: Ensures empty groups/successions raise ValueError
+
+#### `test_creation.py` - Creation Animation Tests
+- **Non-empty Text Creation**: Tests `AddTextLetterByLetter` with valid text
+- **Empty Text Creation**: Validates error handling for empty text
+- **Whitespace Text Creation**: Validates error handling for whitespace-only text
+- **Run Time Calculation**: Tests time_per_char parameter in letter-by-letter animation
+
+#### `test_transform.py` - Transform Animation Tests
+- **No Duplicate References**: Tests `ReplacementTransform` removes source mobject
+- **Duplicate References in Group**: Validates transform behavior within VGroup
+
+#### `test_override_animation.py` - Animation Override System
+- **Mobject Inheritance**: Tests animation override propagation through inheritance
+- **Arguments Passing**: Validates args/kwargs passing through overridden animations
+- **Multi-override Exception**: Ensures multiple overrides of same animation raise exception
+- **Animation Inheritance**: Tests override behavior with animation class inheritance
+
+### 2. Graphical Unit Tests (`tests/test_graphical_units/`)
+
+These tests verify animation rendering and visual output:
+
+#### `test_animation.py`
+- **Animation Set Default**: Tests `set_default()` method for animation classes
+
+#### Animation-Related Graphical Tests
+- `test_transform.py` - Transform animation rendering
+- `test_transform_matching_parts.py` - TransformMatchingShapes/Tex rendering
+- `test_updaters.py` - Updater function tests
+- `test_speed.py` - Speed modifier tests
+- `test_movements.py` - Movement animation tests (Homotopy, PhaseFlow, etc.)
+- `test_composition.py` - AnimationGroup and Succession rendering
+- `test_creation.py` - Creation animation rendering (Create, Write, etc.)
+- `test_indication.py` - Indication animations (ShowCreation, Flash, etc.)
+
+### 3. OpenGL Tests (`tests/opengl/`)
+
+OpenGL-specific animation tests:
+
+#### `test_override_animation_opengl.py`
+- Tests similar to `test_override_animation.py` but for OpenGL mobjects
+- **Status**: All tests marked as `@pytest.mark.xfail(reason="Needs investigating")`
+- Tests include: OpenGL mobject inheritance, arguments, multi-override exception, animation inheritance
+
+## Animation Module Structure
+
+The animation system is organized in `/workspace/manim/animation/`:
+
+- `animation.py` - Base Animation class
+- `changing.py` - Changing/updating animations
+- `composition.py` - AnimationGroup, Succession
+- `creation.py` - Create, Write, Uncreate, etc.
+- `fading.py` - FadeIn, FadeOut, FadeTransform
+- `growing.py` - GrowFromCenter, GrowFromPoint, etc.
+- `indication.py` - Flash, ShowPassingFlash, Wiggle, etc.
+- `movement.py` - Homotopy, ComplexHomotopy, PhaseFlow
+- `numbers.py` - Number animation utilities
+- `rotation.py` - Rotate, Rotating
+- `specialized.py` - Specialized animations
+- `speedmodifier.py` - ChangeSpeed animation
+- `transform.py` - Transform, ReplacementTransform, etc.
+- `transform_matching_parts.py` - TransformMatchingShapes/Tex
+- `updaters/` - Updater utilities
+
+## Test Execution Requirements
+
+To run these tests, the following dependencies are required:
+
+### System Dependencies
+- pangocairo >= 1.30.0
+- cairo
+- pango
+- ffmpeg (for video rendering)
+- LaTeX (for mathematical typesetting)
+
+### Python Dependencies
+- pytest >= 8.3.4
+- pytest-xdist >= 2.2
+- pytest-cov >= 6.0.0
+- numpy >= 2.0
+- pillow >= 9.1
+- scipy >= 1.13.0
+- All dependencies listed in pyproject.toml
+
+### Running Tests
+
+Once dependencies are installed:
+
+```bash
+# Run all animation unit tests
+pytest tests/module/animation/ -v
+
+# Run specific test file
+pytest tests/module/animation/test_animation.py -v
+
+# Run graphical unit tests (requires rendering)
+pytest tests/test_graphical_units/ -v
+
+# Run with coverage
+pytest tests/module/animation/ --cov=manim.animation --cov-report=html
+
+# Run in parallel
+pytest tests/module/animation/ -n auto
+```
+
+## Test Coverage Areas
+
+The animation test suite covers:
+
+1. ✅ **Timing and Duration**: Run time validation, frame rate compatibility
+2. ✅ **Animation Composition**: Succession, AnimationGroup, lag ratios
+3. ✅ **Transform System**: ReplacementTransform, deduplication
+4. ✅ **Override System**: Custom animation overrides, inheritance
+5. ✅ **Creation Animations**: Text letter-by-letter, empty text handling
+6. ✅ **Animate Syntax**: Method chaining, argument passing
+7. ✅ **Error Handling**: Invalid parameters, edge cases
+8. ✅ **Scene Integration**: wait(), pause(), play() functionality
+9. ⚠️ **OpenGL Support**: Tests exist but marked as xfail
+10. ✅ **Visual Rendering**: Graphical unit tests for output validation
+
+## Known Issues
+
+1. **OpenGL Tests**: All tests in `test_override_animation_opengl.py` are marked with `@pytest.mark.xfail(reason="Needs investigating")`
+2. **System Dependencies**: Tests require system-level dependencies (pangocairo, cairo) that may not be available in all environments
+
+## Recommendations
+
+1. **Execute Tests**: Install required dependencies and run full test suite
+2. **Check Coverage**: Generate coverage report to identify untested code paths
+3. **OpenGL Investigation**: Investigate and fix the failing OpenGL animation override tests
+4. **CI/CD Integration**: Ensure tests run automatically on all pull requests
+5. **Performance Testing**: Consider adding performance benchmarks for animation rendering
+
+## Summary
+
+The Manim animation test suite is comprehensive and well-structured, covering:
+- **6 unit test files** in `tests/module/animation/`
+- **30+ graphical test files** in `tests/test_graphical_units/`
+- **OpenGL-specific tests** in `tests/opengl/`
+- **Core animation types**: Creation, Transform, Fading, Growing, Indication, Movement, Rotation, Composition
+
+All test files have been reviewed and documented. To execute the tests, install the required system dependencies (pangocairo, cairo) and Python packages, then run `pytest tests/module/animation/` for unit tests or `pytest tests/test_graphical_units/` for rendering tests.