def test_backend_get_digital_state() -> None:
"""Test that we can read back the digital state of a pin."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
# This should put the pin into the most recent (or default) output state.
backend.set_gpio_pin_mode(2, GPIOPinMode.DIGITAL_OUTPUT)
assert backend.get_gpio_pin_digital_state(2) is False
backend.write_gpio_pin_digital_state(2, True)
assert backend.get_gpio_pin_digital_state(2) is True
backend.write_gpio_pin_digital_state(2, False)
assert backend.get_gpio_pin_digital_state(2) is False
def test_ultrasound_pulse() -> None:
"""Test that we can read an ultrasound pulse time."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
serial = cast(SBArduinoSerial, backend._serial)
serial.check_data_sent_by_constructor()
serial.append_received_data(b"> 2345\n")
duration = backend.get_ultrasound_pulse(3, 4)
serial.check_sent_data(b"T 3 4\n")
assert duration == timedelta(microseconds=2345)
# 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()
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()
def test_backend_get_digital_state_requires_digital_pin() -> None:
"""Check that pins 14-19 are not supported by get digital state."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
with pytest.raises(NotSupportedByHardwareError):
backend.get_gpio_pin_digital_state(14)
def test_backend_get_digital_state_requires_pin_mode() -> None:
"""Check that pin must be in DIGITAL_OUTPUT mode for get digital state to work."""
backend = SBArduinoHardwareBackend("COM0", SBArduinoSerial)
assert backend.get_gpio_pin_mode(2) is not GPIOPinMode.DIGITAL_OUTPUT
with pytest.raises(ValueError):
backend.get_gpio_pin_digital_state(2)