def test_ultrasound_distance_timeout() -> None:
"""Test that None is returned upon a timeout occurring."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
serial = cast(SBArduinoSerial, backend._serial)
serial.check_data_sent_by_constructor()
serial.append_received_data(b"> 0\n")
metres = backend.get_ultrasound_distance(3, 4)
serial.check_sent_data(b"U 3 4\n")
assert metres is None
serial.check_all_received_data_consumed()
def test_ultrasound_distance_on_same_pin() -> None:
"""Test same pin for trigger and echo."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
serial = cast(SBArduinoSerial, backend._serial)
serial.check_data_sent_by_constructor()
serial.append_received_data(b"> 1230\n")
metres = backend.get_ultrasound_distance(3, 3)
serial.check_sent_data(b"U 3 3\n")
assert metres is not None
assert isclose(metres, 1.23)
# Check backend updated its view of what modes the pins are in now.
assert backend.get_gpio_pin_mode(3) is GPIOPinMode.DIGITAL_INPUT
serial.check_all_received_data_consumed()
def test_ultrasound_distance() -> None:
"""Test that we can read an ultrasound distance."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
serial = cast(SBArduinoSerial, backend._serial)
serial.check_data_sent_by_constructor()
serial.append_received_data(b"> 1230\n")
metres = backend.get_ultrasound_distance(3, 4)
serial.check_sent_data(b"U 3 4\n")
assert metres is not None
assert isclose(metres, 1.23)
# Check backend updated its view of what modes the pins are in now.
assert backend.get_gpio_pin_mode(3) is GPIOPinMode.DIGITAL_OUTPUT
assert backend.get_gpio_pin_digital_state(3) is False
assert backend.get_gpio_pin_mode(4) is GPIOPinMode.DIGITAL_INPUT
serial.check_all_received_data_consumed()