def test_turn_left__only_changes_facing_direction():
robot = Robot()
robot.position = Position(3, 2, Direction.SOUTH)
robot.turn_left()
assert robot.position == Position(3, 2, Direction.EAST)
def test_robot_has_been_placed(position, want):
robot = Robot()
robot.position = position
got = robot.has_been_placed()
assert got == want
def test_move_forward__moves_the_robot_in_its_facing_direction(
current_position, new_position, table):
robot = Robot()
robot.position = current_position
table.move_forward(robot)
assert robot.position == new_position
def test_move_forward__raises_exception_when_the_next_position_is_off_the_table(
current_position, table):
robot = Robot()
robot.position = deepcopy(current_position)
with pytest.raises(InvalidPositionError):
table.move_forward(robot)
assert robot.position == current_position