def test_robot_left(self):
subject = Robot()
subject.left()
self.assertEqual(subject.x, 0)
self.assertEqual(subject.y, 0)
self.assertEqual(subject.facing, 'WEST')
def test_robot_move_west_from_origin(self):
subject = Robot()
subject.left()
subject.move()
self.assertEqual(subject.x, 0)
self.assertEqual(subject.y, 0)
self.assertEqual(subject.facing, 'WEST')
def test_robot_move_south_from_origin(self):
subject = Robot()
subject.left()
subject.left()
subject.move()
self.assertEqual(subject.x, 0)
self.assertEqual(subject.y, 0)
self.assertEqual(subject.facing, 'SOUTH')