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MosisService/docs/MILESTONE-2.md

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# Milestone 2: Testing Framework
**Status**: 100% Complete
**Goal**: Automated UI testing for rapid iteration and AI agent verification.
---
## Overview
The testing framework enables automated validation of UI behavior through:
- UI hierarchy inspection (JSON dump)
- Input simulation and recording
- Log verification for navigation events
- Visual regression testing via screenshot diff
- JSON test results compatible with CI/CD
---
## Current State
### Completed Components
| Component | File | Status |
|-----------|------|--------|
| Action Types | `designer/src/testing/action_types.h` | Complete |
| Action Recorder | `designer/src/testing/action_recorder.h/.cpp` | Complete |
| Action Player | `designer/src/testing/action_player.h/.cpp` | Complete |
| UI Inspector | `designer/src/testing/ui_inspector.cpp` | Complete |
| Visual Capture | `designer/src/testing/visual_capture.cpp` | Complete |
| Test Runner | `designer-test/src/test_runner.cpp` | Complete |
| CLI Integration | `designer/src/main.cpp` | Complete |
### Already Working
1. **Action Types** (`action_types.h`)
- TapAction, SwipeAction, LongPressAction
- ButtonAction, WaitAction, KeyAction
- ActionSequence container with metadata
2. **Action Recorder** (`action_recorder.h/.cpp`)
- Mouse down/up/move tracking
- Automatic gesture classification (tap vs swipe vs long press)
- JSON serialization/deserialization
- Configurable thresholds
3. **Action Player** (`action_player.h/.cpp`)
- Timestamp-based playback
- RmlUi event injection
- Pause/resume/stop controls
- Progress tracking
4. **UI Inspector** (`ui_inspector.cpp`)
- Full element tree traversal
- JSON export with bounds, IDs, classes
- Continuous hierarchy dumping mode
5. **Test Runner** (`designer-test/`)
- WindowController (Windows SendInput)
- HierarchyReader (element lookup)
- LogParser (navigation verification)
- All 5 navigation tests passing
---
## Recently Completed
### Screenshot Diff Implementation (Complete)
**File**: `designer/src/testing/visual_capture.cpp`
Implemented real PNG pixel-by-pixel comparison:
- `LoadPNG()` helper function loads PNG files using libpng
- `PixelsMatch()` compares pixels with configurable tolerance (default: 2)
- `CompareImages()` returns difference ratio (0.0 = identical, 1.0 = completely different)
### Recording/Playback CLI (Complete)
**File**: `designer/src/main.cpp`
Added CLI options and keyboard controls:
- `--record <file>` - Enable recording mode
- `--playback <file>` - Play back recorded actions
- F5 - Start/stop recording (saves to specified file)
- F6 - Pause/resume playback
**Usage**:
```bash
# Record interactions
mosis-designer.exe home.rml --record my-test.json
# Press F5 to start recording, interact, press F5 again to save
# Play back
mosis-designer.exe home.rml --playback my-test.json
```
---
## Completed: GLFW Input Hooks for Recording
### Task 2.3: GLFW Input Hooks
**Status**: Complete
**Solution Implemented**:
Forked the RmlUi backend files into `designer/src/backend/` with input recording hooks:
1. **RmlUi_Backend.h** - Added callback type definitions:
- `MouseButtonCallback` - Called on mouse button press/release
- `MouseMoveCallback` - Called on mouse movement
- `KeyCallback` - Called on key press/release
2. **RmlUi_Backend_GLFW_GL3.cpp** - Modified GLFW callbacks to:
- Track mouse position in framebuffer coordinates
- Call recording callbacks before forwarding to RmlUi
- Support all three callback types
3. **main.cpp** - Connected callbacks to ActionRecorder:
- Mouse button events trigger `RecordMouseDown`/`RecordMouseUp`
- Mouse move events trigger `RecordMouseMove`
- Key events trigger `RecordKey`
**Files Added**:
- `designer/src/backend/RmlUi_Backend.h`
- `designer/src/backend/RmlUi_Backend_GLFW_GL3.cpp`
- `designer/src/backend/RmlUi_Platform_GLFW.h`
- `designer/src/backend/RmlUi_Platform_GLFW.cpp`
---
## File Changes Summary
| File | Changes | Status |
|------|---------|--------|
| `designer/src/testing/visual_capture.cpp` | Real PNG pixel comparison | Done |
| `designer/src/main.cpp` | --record/--playback CLI, F5/F6 keys | Done |
| `designer/src/RmlUi_Backend.h` | Expose GLFW window for recording | Future |
---
## Test Recording Format
```json
{
"name": "Navigate to contacts and back",
"description": "Test navigation flow",
"screen_width": 540,
"screen_height": 960,
"initial_screen": "apps/home/home.rml",
"actions": [
{"type": "tap", "x": 413, "y": 1174, "timestamp": 0},
{"type": "wait", "duration": 1000, "timestamp": 100},
{"type": "tap", "x": 40, "y": 28, "timestamp": 1100},
{"type": "swipe", "x1": 100, "y1": 500, "x2": 100, "y2": 200, "duration": 300, "timestamp": 2000}
]
}
```
---
## Acceptance Criteria
- [x] `CompareImages()` returns accurate pixel difference ratio
- [ ] `--record <file>` captures all mouse/key events to JSON (needs GLFW hooks)
- [x] `--playback <file>` replays recorded actions with correct timing
- [x] Recording stops gracefully on F5 or window close
- [x] Playback shows progress in console
- [x] Screenshot diff with 2-pixel tolerance per channel
---
## Future Enhancements (Not This Milestone)
- Visual diff output (highlight changed pixels)
- Parallel test execution
- Android action recording/playback
- Cross-platform test runner
- Coverage reporting