def test_servo_write_raises_if_position_out_of_bounds(mock_comm):
servo = Servo('TEST', mock_comm)
with pytest.raises(ValueError):
servo.write(-1.1)
def test_servo_write_sets_desired_position(mock_comm):
servo = Servo('TEST', mock_comm)
mock_comm.reset_output_buffer()
servo.write(0.4)
assert mock_comm.readline() == '#TESTP1700\r'
assert servo.position == 0.4
