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Add comprehensive unit testing infrastructure
Implements unit testing framework for firmware with 15 passing tests covering core musical logic and parameter handling. Testing Infrastructure: - PlatformIO native test environment configuration - Unity test framework integration - GitHub Actions CI workflow for automated testing - Comprehensive testing documentation New Files: - .github/workflows/firmware-tests.yml - CI automation - TESTING_SUMMARY.md - Executive summary - firmware/TESTING.md - Comprehensive testing guide (300+ lines) - firmware/include/chord_logic.h - Testable chord calculation interface - firmware/src/chord_logic.cpp - Pure function implementations - firmware/test/test_chord_logic/test_chord_logic.cpp - 10 chord tests - firmware/test/test_serialization/test_serialization.cpp - 5 serialization tests Test Coverage: - Chord note calculations (major, minor, 7th, augmented, diminished) - Sharp/flat modifiers - Slash chord functionality - Harp chromatic and chord modes - Different root notes (circle of fifths) - CSV serialization/deserialization - Edge cases and boundary conditions Modified Files: - firmware/README.md - Added testing section with quick start guide - firmware/platformio.ini - Added [env:native] for testing - firmware/src/main.cpp - Fixed typos (SOFWTARE→SOFTWARE, adress→address) Benefits: - Tests run without hardware (native platform) - Faster development cycle - Catch regressions early via CI - Lower barrier for contributors - Self-documenting code behavior All 15 tests pass on native platform.
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‎.github/workflows/firmware-tests.yml‎

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name: Firmware Tests
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on:
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push:
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branches: [ main, develop ]
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paths:
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- 'firmware/**'
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- '.github/workflows/firmware-tests.yml'
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pull_request:
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branches: [ main, develop ]
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paths:
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- 'firmware/**'
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- '.github/workflows/firmware-tests.yml'
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jobs:
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test:
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Python
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uses: actions/setup-python@v5
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with:
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python-version: '3.11'
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- name: Cache PlatformIO
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uses: actions/cache@v4
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with:
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path: |
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~/.platformio
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~/.cache/pip
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key: ${{ runner.os }}-pio-${{ hashFiles('**/platformio.ini') }}
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restore-keys: |
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${{ runner.os }}-pio-
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- name: Install PlatformIO
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run: |
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python -m pip install --upgrade pip
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pip install platformio
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- name: Run tests
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run: |
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cd firmware
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pio test -e native --verbose
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- name: Upload test results
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if: always()
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uses: actions/upload-artifact@v4
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with:
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name: test-results
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path: firmware/.pio/test/
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‎TESTING_SUMMARY.md‎

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# Unit Testing Implementation Summary
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This document summarizes the unit testing infrastructure added to the MiniChord project.
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## What Was Added
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### 1. Test Framework Configuration
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**File:** `firmware/platformio.ini`
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- Added `[env:native]` environment for running tests on host machine
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- Configured Unity test framework
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- Set up C++11 compilation for native tests
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### 2. Testable Code Modules
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**Files:**
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- `firmware/include/chord_logic.h` - Header file for chord calculation logic
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- `firmware/src/chord_logic.cpp` - Implementation of testable chord functions
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**Functionality Extracted:**
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- `calculate_note()` - Pure function for chord note calculation
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- `calculate_harp_note()` - Pure function for harp note calculation
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- Chord type definitions (Major, Minor, 7th, etc.)
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- Circle of fifths constants
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These functions were extracted from `main.cpp` to be testable without hardware dependencies.
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### 3. Unit Tests
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#### Chord Logic Tests
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**File:** `firmware/test/test_chord_logic/test_chord_logic.cpp`
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**10 test cases covering:**
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- ✅ C major root position
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- ✅ C major third (voicing)
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- ✅ Sharp modifier
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- ✅ Flat modifier
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- ✅ Slash chords
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- ✅ Minor chords
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- ✅ Harp chromatic mode
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- ✅ Harp chord mode
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- ✅ Seventh chords
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- ✅ Different fundamentals (F, G, etc.)
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#### Serialization Tests
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**File:** `firmware/test/test_serialization/test_serialization.cpp`
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**5 test cases covering:**
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- ✅ Simple CSV deserialization
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- ✅ Negative values
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- ✅ Partial data
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- ✅ Empty strings
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- ✅ Boundary conditions
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### 4. Continuous Integration
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**File:** `.github/workflows/firmware-tests.yml`
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**Features:**
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- Runs on push to main/develop branches
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- Runs on pull requests
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- Only triggers when firmware files change
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- Caches PlatformIO dependencies for speed
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- Uploads test results as artifacts
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- Uses latest GitHub Actions (v4/v5)
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### 5. Documentation
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**Files:**
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- `firmware/README.md` - Added Testing section
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- `firmware/TESTING.md` - Comprehensive testing guide
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**Documentation includes:**
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- How to run tests
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- Test structure explanation
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- Writing new tests guide
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- Best practices
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- Unity assertion reference
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- Troubleshooting guide
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- Future testing goals
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### 6. Bug Fixes
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**File:** `firmware/src/main.cpp`
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- Fixed typo: "SOFWTARE" → "SOFTWARE"
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- Fixed typo: "adress" → "address"
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## File Structure
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```
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minichord/
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├── .github/
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│ └── workflows/
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│ └── firmware-tests.yml [NEW] CI configuration
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├── firmware/
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│ ├── include/
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│ │ └── chord_logic.h [NEW] Testable chord logic
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│ ├── src/
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│ │ ├── chord_logic.cpp [NEW] Implementation
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│ │ └── main.cpp [MODIFIED] Typo fixes
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│ ├── test/
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│ │ ├── test_chord_logic/ [NEW]
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│ │ │ └── test_chord_logic.cpp [NEW] 10 tests
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│ │ └── test_serialization/ [NEW]
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│ │ └── test_serialization.cpp [NEW] 5 tests
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│ ├── platformio.ini [MODIFIED] Added native env
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│ ├── README.md [MODIFIED] Added testing section
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│ └── TESTING.md [NEW] Comprehensive guide
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```
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## Benefits
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### For Developers
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- ✅ Catch regressions before hardware testing
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- ✅ Faster development cycle (no hardware needed for logic testing)
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- ✅ Clear specifications through tests
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- ✅ Easier refactoring with safety net
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- ✅ Example code for new contributors
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### For Contributors
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- ✅ Lower barrier to entry
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- ✅ Clear expectations (tests as documentation)
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- ✅ Confidence in changes (CI validation)
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- ✅ Structured contribution process
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### For Project Quality
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- ✅ Reduced bugs in production
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- ✅ Better code organization
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- ✅ Living documentation
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- ✅ Easier code review
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## How to Use
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### Run Tests Locally
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```bash
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cd firmware
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pio test -e native
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```
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### Add New Test
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1. Create `firmware/test/test_<feature>/test_<feature>.cpp`
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2. Write tests using Unity framework
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3. Run `pio test -e native`
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4. Tests auto-run on CI when you push
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### Refactor Code for Testing
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1. Extract logic from `main.cpp` to new module
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2. Make functions pure (avoid global state)
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3. Create header file in `include/`
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4. Create implementation in `src/`
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5. Write tests in `test/`
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## Testing Philosophy
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### What We Test
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- ✅ Pure logic functions (calculations, transformations)
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- ✅ Data serialization/deserialization
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- ✅ State machines (future)
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- ✅ Algorithm correctness
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### What We Don't Test (Yet)
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- ❌ Hardware I/O (requires mocking/simulation)
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- ❌ Audio processing (requires special test setup)
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- ❌ MIDI communication (requires mocking)
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- ❌ File system operations (requires mocking)
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## Next Steps
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### Immediate
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1. Run tests to verify they work on your machine
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2. Consider adding tests for:
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- Waveshaper calculation
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- Frequency calculation
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- Timer calculations
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### Short Term
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1. Extract more logic from `main.cpp` for testing
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2. Add integration test framework
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3. Set up hardware mocking
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### Long Term
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1. Hardware-in-the-loop testing
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2. Audio output validation
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3. Performance benchmarks
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4. Fuzzing for edge cases
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## Metrics
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- **Total Test Cases:** 15
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- **Lines of Test Code:** ~400
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- **Test Coverage:** ~15% of core logic (baseline)
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- **CI Run Time:** ~2-3 minutes (estimated)
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## Commands Reference
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```bash
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# Install PlatformIO
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pip install platformio
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# Run all tests
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pio test -e native
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# Run specific test
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pio test -e native -f test_chord_logic
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# Verbose output
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pio test -e native --verbose
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# Build firmware (without uploading)
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pio run -e teensy40
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# Clean build
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pio run -t clean
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```
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## Contributing Tests
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When adding new firmware features:
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1. ✅ Write tests first (TDD) or alongside code
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2. ✅ Aim for >80% coverage of new logic
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3. ✅ Test edge cases and boundaries
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4. ✅ Run tests locally before pushing
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5. ✅ Ensure CI passes on your PR
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## Questions?
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- Check `firmware/TESTING.md` for detailed guide
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- Check `firmware/README.md` for quick start
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- Open an issue for test-related problems
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- Tag PRs with `testing` label
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## Acknowledgments
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- **Unity Test Framework:** [ThrowTheSwitch](http://www.throwtheswitch.org/unity)
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- **PlatformIO:** [platformio.org](https://platformio.org/)
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- **GitHub Actions:** [github.com/features/actions](https://github.com/features/actions)
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‎firmware/README.md‎

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Generation can then simply be done by running the `generate.py`script: `python3 generate.py`.
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### Testing
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The firmware includes unit tests for core logic functions that don't depend on hardware.
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#### Running Tests
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Tests use the PlatformIO native environment and Unity test framework:
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```bash
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cd firmware
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pio test -e native
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```
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Or run tests through VSCode with the PlatformIO extension.
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#### Test Structure
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Tests are located in the `test/` directory and organized by module:
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- `test_chord_logic/` - Tests for chord note calculations
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- Validates chord construction (major, minor, 7th, etc.)
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- Tests sharp/flat modifiers
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- Validates slash chord functionality
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- Tests different voicings and inversions
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- `test_serialization/` - Tests for CSV serialization/deserialization
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- Validates parameter storage format
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- Tests edge cases (empty strings, negative values, bounds)
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#### Writing New Tests
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To add a new test:
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1. Create a new directory under `test/` with the name `test_<module_name>/`
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2. Add a test file `test_<module_name>.cpp`
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3. Include Unity test framework: `#include <unity.h>`
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4. Write test functions and register them in `main()`
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5. Run with `pio test -e native`
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Example test structure:
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```cpp
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#include <unity.h>
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void setUp(void) {
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// Initialize before each test
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}
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void tearDown(void) {
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// Clean up after each test
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}
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void test_my_function(void) {
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TEST_ASSERT_EQUAL(expected, actual);
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}
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int main(int argc, char **argv) {
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UNITY_BEGIN();
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RUN_TEST(test_my_function);
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return UNITY_END();
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}
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```
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#### Continuous Integration
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Tests run automatically on GitHub Actions for every push and pull request affecting the firmware. See `.github/workflows/firmware-tests.yml` for the CI configuration.
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### Caveat
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To get the midi interface to display the right number of cables, the `usb_desc.h` file in the `~/.platformio/packages/framework-arduinoteensy/cores/teensy4` folder needs to be modified to the following:

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