def test_turn_left_on_robot_not_placed():
with pytest.raises(MissingPlaceCommandException) as e:
robot = Robot()
robot.turn_left()
assert str(e.value) == 'Robot not placed.'
assert robot.x_coordinate is None
assert robot.y_coordinate is None
assert robot.facing is None
def test_turn_left_on_robot_placed(input_params, expected_direction):
robot = Robot()
robot.place(input_params)
robot.turn_left()
assert robot.facing == expected_direction