Testing

Test Organization

test/sensor_board/
├── test_gps_sensor/
│   ├── NMEA parsing verification
│   ├── Coordinate validation
│   └── Fix quality enumeration tests
│
├── test_imu_sensor/
│   ├── 3-axis data structure tests
│   ├── Acceleration magnitude calculation
│   └── Timestamp tracking validation
│
├── test_load_sensor/
│   ├── Force calculation (tare/scale)
│   ├── Mass conversion (g/kg/lbf)
│   ├── Dual sensor independence
│   └── Calibration parameter storage
│
├── test_ph_sensor/
│   ├── ADC to voltage conversion
│   ├── pH value calculation
│   ├── Sample averaging (40-sample buffer)
│   ├── Calibration offset/slope
│   └── Edge cases (pH 0, 14)
│
├── test_pressure_sensor/
│   ├── Pressure reading validation
│   ├── Temperature compensation
│   ├── Unit conversions (bar/psi/kPa)
│   └── Dual sensor independence
│
└── test_sensor_basics/
    ├── Conversion functions
    ├── Validation functions
    ├── Range checking
    └── Boundary conditions

Validation Functions

GPS Validation

result_t validate_gps_latitude(double latitude);
// Valid range: -90.0 to +90.0 degrees

result_t validate_gps_longitude(double longitude);
// Valid range: -180.0 to +180.0 degrees

result_t validate_gps_hdop(float hdop);
// Typical range: 0.0 to 50.0

result_t validate_gps_satellite_count(int32_t satellites);
// Typical range: 0 to 30 satellites

pH Validation

result_t validate_ph_value(float ph_value);
// Valid range: 0.0 to 14.0

IMU Validation

result_t validate_accelerometer_value(float accel_value);
// Typical range: -50.0 to +50.0 m/s²

result_t validate_imu_data(float accel_x, float accel_y, float accel_z);

Unit Conversion Tests(extra stuff)

result_t celsius_to_fahrenheit(float celsius, float *fahrenheit);
result_t fahrenheit_to_celsius(float fahrenheit, float *celsius);
result_t bar_to_psi(float bar, float *psi);
result_t psi_to_bar(float psi, float *bar);

Test Framework

Testing Technology

Framework: Unity (open-source testing framework)
Build System: CMake / PlatformIO
Test Type: Hosted unit tests (run on PC)
Mocking: Mock ADC/UART/I2C interfaces

Building Tests

// Build all tests
pio test -e sensor_board

// Run specific test suite
pio test -e sensor_board -f test_ph_sensor

Debugging & Troubleshooting

Issue	Cause	Solution
Sensor IDLE	Not connected	Check UART/I2C/SPI wiring
Sensor ERROR	Communication failure	Verify baud rates, addresses
Invalid data	Out of range	Check calibration parameters
Low heap warning	Memory leak	Review packet encoder