def test_moves_forward(
self,
direction: Direction,
initial_coordinates: Coordinates,
final_coordinates: Coordinates,
) -> None:
rover = Rover(Position(direction, initial_coordinates))
rover.move_forward()
assert rover.position() == Position(direction, final_coordinates)
class MarsRoverApplication:
@classmethod
def landing_with(cls, rover_position: str) -> 'MarsRoverApplication':
try:
return cls(PositionFormat().position_from(rover_position))
except RoverOutsideSurface:
raise UserInputError.rover_outside_surface()
def __init__(self, position: Position) -> None:
self._rover = Rover(position)
def rover_position(self) -> str:
return PositionFormat().output_from(self._rover.position())
def execute(self, command: str) -> None:
if command == 'f':
self._rover.move_forward()
elif command == 'b':
self._rover.move_backward()
elif command == 'r':
self._rover.turn_right()
elif command == 'l':
self._rover.turn_left()
else:
raise UserInputError.unknown_command(command)
def test_can_not_land_outside_of_the_surface(
self, coordinates: Coordinates) -> None:
with pytest.raises(RoverOutsideSurface):
Rover(Position(Direction.north(), coordinates))
def test_turns_left(self, initial_direction: Direction,
final_direction: Direction) -> None:
rover = Rover(Position(initial_direction, Coordinates(3, 3)))
rover.turn_left()
assert rover.position() == Position(final_direction, Coordinates(3, 3))
def test_does_not_move_backward_outside_the_surface(
self, position: Position) -> None:
rover = Rover(position)
rover.move_backward()
assert rover.position() == position
def __init__(self, position: Position) -> None:
self._rover = Rover(position)