def test_set_left_motor_invalid():
serial = MockSerial(INVALID_RESPONSE)
attiny = AttinyProtocol(serial)
with pytest.raises(InvalidResponseException):
attiny.set_left_motor(0)
assert serial.received[:1] == SET_LEFT_MOTOR
def test_set_left_motor_nak():
serial = MockSerial(NAK)
attiny = AttinyProtocol(serial)
result = attiny.set_left_motor(0)
assert result == False
def test_set_left_motor_timeout():
serial = MockSerial(b'')
attiny = AttinyProtocol(serial)
result = attiny.set_left_motor(0)
assert result == False
def test_set_left_motor_zero():
serial = MockSerial(ACK)
left = MOTOR_ZERO
left_bytes = BYTES_MOTOR_ZERO
attiny = AttinyProtocol(serial)
result = attiny.set_left_motor(left)
assert len(serial.received) == 2
assert serial.received == SET_LEFT_MOTOR + left_bytes
assert result == True