def test_warmer_colder(self):
self.world = universe.create_world('pushblock', warmercolder=True)
block = self.world.objects['block']
player = self.world.objects['agent']
goal = self.world.objects['goal']
goal.position = (10, 10)
block.position = goal.position + (2, 0)
player.position = goal.position + (3, 0)
# check that we lose a point when the block doesn't get closer to the
# goal
obs, reward, done, info = self.world.step('NOOP')
self.assertEqual(reward, -1)
self.assertFalse(done)
# check that we get a point when the block does get closer to the goal
obs, reward, done, info = self.world.step('UP')
self.assertEqual(reward, 1)
self.assertFalse(done)
# check that we get points and the episode ends when the block is on
# top of the goal
obs, reward, done, info = self.world.step('UP')
self.assertEqual(reward, 1001)
self.assertTrue(done)
def run_world(name):
"""Check that we can run a world and that it behaves as expected"""
#save the initial class-hierarchy state so we don't pollute the namespace
TypeFamily._save_class_hierarchy_state()
params = {}
#make sure we don't get prompted for actions
world_params = universe.load_parameters(name, reload_module=True)
if issubclass(core.Agent.get_class(world_params['agent']), HumanAgent):
params['agent'] = 'random'
#create the world
world = universe.create_world(name, reload_module=True, **params)
#test the world
tc.TestWorld('test_world', world=world).test_world()
#run the simulation for a bit
tc.TestWorld('test_run', world=world).test_run()
#examine the world again
tc.TestWorld('test_world', world=world).test_world()
#make sure we can rewind the world
tc.TestWorld('test_state', world=world).test_state()
#restore the initial class-hierarchy state
TypeFamily._restore_class_hierarchy_state()
def test_loop(self):
"""Check that ghost goes around a loop when there are no branching choices"""
objects, height, width = h.world.screen(
"""
XXXXXXXXX
X BX*X
X XXX XXX
X XXX
XXXXXXXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
blinky = self.world.objects['blinky']
blinky.orientation = 1 #UP
self.assertTrue(np.array_equal(blinky.position, (1, 5)))
# the squares of the track
track = ([(1, x) for x in xrange(5, 0, -1)] + [(y, 1)
for y in xrange(2, 4)] +
[(3, x) for x in xrange(2, 6)] + [(2, 5)])
# go around the track two times
for _ in xrange(2):
for t in track:
# check that Blinky is where we expect
self.assertTrue(np.array_equal(blinky.position, t))
obs, reward, done, info = self.world.step('NOOP')
def test_skull_behavior(self):
# create the objects we want
screen = """
------------------
- -
X @ * X
------------------
- -
- -
- -
- -
- -
------------------
"""
objects, width, height = h.world.screen(screen, pixelzuma.legend)
self.world = universe.create_world('pixelzuma',
objects=objects,
width=width,
height=height)
# remember skull's initial position
skull = self.world.objects['skull']
anchor = skull.position
# check skull's movement
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, 1)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, 2)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, 3)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, 2)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, 1)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, 0)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, -1)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, -2)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, -3)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, -2)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, -1)))
self.world.step('NOOP')
self.assertTrue(np.array_equal(skull.position, anchor + (0, 0)))
def test_key_usable(self):
# create the objects we want
screen = """
------------------
- -
X D * X
------------------
- -
- -
- -
- -
- -
------------------
"""
objects, width, height = h.world.screen(screen, pixelzuma.legend)
self.world = universe.create_world('pixelzuma',
objects=objects,
width=width,
height=height)
# give pedro a key
self.world.objects['pedro'].inventory = ['KEY']
# check that we get a reward and that we can move through the door
obs, reward, done, info = self.world.step('LEFT')
self.assertEqual(reward, 0)
self.assertFalse(done)
obs, reward, done, info = self.world.step('LEFT')
self.assertEqual(reward, 300)
self.assertFalse(done)
obs, reward, done, info = self.world.step('LEFT')
self.assertEqual(reward, 0)
self.assertFalse(done)
def test_ball_leaves_screen(self):
# create the obejcts we want
objects, height, width = h.world.screen("""
WWWW
W BW
W* W
""", block_breaker.legend)
self.world = universe.create_world('block_breaker',
objects=objects,
height=height,
width=width)
# point the ball down and to the right
self.world.objects['ball'].velocity = (1.01, 1)
# get the goal
self.assertEqual(len(self.world.goals), 1)
goal = self.world.goals['bricks_destroyed']
# check that goal is not achieved
self.assertFalse(goal.is_achieved())
# step
obs, reward, done, info = self.world.step('NOOP')
# check that we got a penalty and that the episode terminated
self.assertEqual(reward, -1001)
self.assertTrue(done)
# check that goal is not achieved
self.assertFalse(goal.is_achieved())
def test_actions(self):
"""Test that actions have the right effect"""
# create the objects we want
objects, height, width = h.world.screen("""
XXXX
X* X
X X
XXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
player = self.world.objects['chomper_player']
posn = player.position
# check that actions do what we think they should
self.world.step('RIGHT')
self.assertTrue(np.array_equal(player.position, posn + (0, 1)))
self.world.step('DOWN')
self.assertTrue(np.array_equal(player.position, posn + (1, 1)))
self.world.step('LEFT')
self.assertTrue(np.array_equal(player.position, posn + (1, 0)))
self.world.step('UP')
self.assertTrue(np.array_equal(player.position, posn))
def __init__(self, name, run=True, end_prompt=True, **kwargs):
self._name = name
#create the environment
self.world = universe.create_world(name,
defaults=self._defaults,
**kwargs)
def test_teleport_ghost(self):
"""Test that the teleporter teleports ghosts"""
objects, height, width = h.world.screen(
"""
XXXXXXXXXXXXXX
TB T
XXXXXXXXXXXXXX
X*XXXXXXXXXXXX
XXXXXXXXXXXXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
blinky = self.world.objects['blinky']
blinky.orientation = 0
self.world.step('NOOP')
self.assertTrue(np.array_equal(blinky.position, (1, 13)),
repr(blinky.position))
self.world.step('NOOP')
blinky.orientation = 2
self.world.step('NOOP')
self.assertTrue(np.array_equal(blinky.position, (1, 0)),
repr(blinky.position))
def test_enclosure(self):
seen_enclosed = seen_not_enclosed = False
for seed in xrange(100):
if seen_enclosed and seen_not_enclosed:
break
self.world = universe.create_world('enclosure', seed=seed)
block = self.world.objects['block']
container = self.world.objects['container']
tlbr = container.extent
objects = [x for x in self.world.objects if x.name == 'basic']
if tlbr[0] <= block.position[0] <= tlbr[2] and tlbr[1] <= block.position[1] <= tlbr[3]:
seen_enclosed = True
# check that true class is correct
self.assertEqual(self.world.enclosure_true_class, 'ENCLOSED')
# check that we get a reward for correct classification and the
# episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_ENCLOSED')
self.assertEqual(reward, 99)
self.assertTrue(done)
# check that we get a penalty for incorrect classification and
# the episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_NOT_ENCLOSED')
self.assertEqual(reward, -101)
self.assertTrue(done)
# check that we can change the true class
block.position = (1, 1)
self.assertEqual(self.world.enclosure_true_class, 'NOT_ENCLOSED')
else:
seen_not_enclosed = True
# check that true class is correct
self.assertEqual(self.world.enclosure_true_class, 'NOT_ENCLOSED')
# check that we get a penalty for incorrect classification and
# the episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_ENCLOSED')
self.assertEqual(reward, -101)
self.assertTrue(done)
# check that we get a reward for correct classification and the
# episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_NOT_ENCLOSED')
self.assertEqual(reward, 99)
self.assertTrue(done)
# check that we can change the true class
self.world.objects['classifier'].position = (10, 10)
block.position = container.position
self.assertEqual(self.world.enclosure_true_class, 'ENCLOSED')
# check that we've seen both cases
self.assertTrue(seen_enclosed)
self.assertTrue(seen_not_enclosed)
def test_ghosts_reverse_on_pellet(self):
"""Test that ghosts reverse direction when Chomper eats a power pellet"""
objects, height, width = h.world.screen(
"""
XXXXXXXXXXXXXX
X B P I CX
XXXXXXXXXXXXXX
X*O X
XXXXXXXXXXXXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
player = self.world.objects['chomper_player']
blinky = self.world.objects['blinky']
pinky = self.world.objects['pinky']
inky = self.world.objects['inky']
clyde = self.world.objects['clyde']
# point ghosts left
blinky.orientation = 0
pinky.orientation = 0
inky.orientation = 0
clyde.orientation = 0
obs, reward, done, info = self.world.step('RIGHT')
self.assertEqual(blinky.orientation, 2)
self.assertEqual(pinky.orientation, 2)
self.assertEqual(inky.orientation, 2)
self.assertEqual(clyde.orientation, 2)
def test_teleport(self):
"""Test that the teleporter teleports Chomper"""
objects, height, width = h.world.screen(
"""
XXXXXXXXXXXXXX
T* T
XXXXXXXXXXXXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
player = self.world.objects['chomper_player']
self.world.step('LEFT')
self.assertTrue(np.array_equal(player.position, (1, 13)),
repr(player.position))
self.world.step('LEFT')
self.world.step('RIGHT')
self.assertTrue(np.array_equal(player.position, (1, 0)),
repr(player.position))
def test_respawn(self):
# create the objects we want
screen = """
------------------
- -
X S * X
------------------
- -
- -
- -
- -
- -
------------------
"""
objects, width, height = h.world.screen(screen, pixelzuma.legend)
self.world = universe.create_world('pixelzuma',
objects=objects,
width=width,
height=height)
pedro = self.world.objects['pedro']
posn = pedro.position
self.world.step('LEFT')
self.world.step('LEFT')
self.world.step('NOOP')
# check that we respawn in our original position
self.assertTrue(np.array_equal(pedro.position, posn))
def test_ghosts_reverse_on_mode_change(self):
"""Test that ghosts reverse direction when the mode changes"""
objects, height, width = h.world.screen(
"""
XXXXXXXXXXXXXXX
X B P I C X
XXXXXXXXXXXXXXX
X* X
XXXXXXXXXXXXXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
player = self.world.objects['chomper_player']
blinky = self.world.objects['blinky']
pinky = self.world.objects['pinky']
inky = self.world.objects['inky']
clyde = self.world.objects['clyde']
# point ghosts left
blinky.orientation = 0
pinky.orientation = 0
inky.orientation = 0
clyde.orientation = 0
self.world.time = 29
obs, reward, done, info = self.world.step('NOOP')
self.assertEqual(blinky.orientation, 2)
self.assertEqual(pinky.orientation, 2)
self.assertEqual(inky.orientation, 2)
self.assertEqual(clyde.orientation, 2)
def test_actions(self):
self.world = universe.create_world('mazes',
seed=0,
method='subdivide',
width=7,
height=7)
self.world.remove_objects(self.world.objects['wall'])
objects, _, _ = h.world.screen(
"""
WWWWWWW
W W W
W W W
W WW
W W W
W W W
WWWWWWW
""", self.world._legend)
self.world.create_objects(objects)
player = self.world.objects['self']
posn = player.position
# check that actions do what we expect
self.world.step('RIGHT')
self.assertTrue(np.array_equal(player.position, posn + (0, 1)))
self.world.step('DOWN')
self.assertTrue(np.array_equal(player.position, posn + (1, 1)))
self.world.step('LEFT')
self.assertTrue(np.array_equal(player.position, posn + (1, 0)))
self.world.step('UP')
self.assertTrue(np.array_equal(player.position, posn))
def test_energy(self):
self.world = universe.create_world('same_vs_different', seed=0)
self.world.agent = agents.RandomAgent(self.world)
energy = self.world.energy
for _ in xrange(100):
self.world.step()
self.assertEqual(self.world.energy, energy)
def test_position_y(self):
seen_same = seen_different = False
for seed in xrange(100):
if seen_same and seen_different:
break
self.world = universe.create_world('same_vs_different',
seed=seed,
attribute='position_y')
objects = [x for x in self.world.objects if x.name != 'self']
if objects[0].position_y == objects[1].position_y:
seen_same = True
# check that true class is correct
self.assertEqual(self.world.svd_true_class, 'SAME')
# check that we get a reward for correct classification and the
# episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_SAME')
self.assertEqual(reward, 99)
self.assertTrue(done)
# check that we get a penalty for incorrect classification and
# the episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_DIFFERENT')
self.assertEqual(reward, -101)
self.assertTrue(done)
# check that we can change the true class
objects[0].position_y = objects[1].position_y + 1
self.assertEqual(self.world.svd_true_class, 'DIFFERENT')
else:
seen_different = True
# check that true class is correct
self.assertEqual(self.world.svd_true_class, 'DIFFERENT')
# check that we get a penalty for incorrect classification and
# the episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_SAME')
self.assertEqual(reward, -101)
self.assertTrue(done)
# check that we get a reward for correct classification and the
# episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_DIFFERENT')
self.assertEqual(reward, 99)
self.assertTrue(done)
# check that we can change the true class
objects[0].position_y = objects[1].position_y
self.assertEqual(self.world.svd_true_class, 'SAME')
# check that we've seen both cases
self.assertTrue(seen_same)
self.assertTrue(seen_different)
def test_energy(self):
self.world = universe.create_world('occlusion', seed=0)
# check that energy is conserved
self.world.agent = agents.RandomAgent(self.world)
energy = self.world.energy
for _ in xrange(100):
self.world.step()
self.assertEqual(self.world.energy, energy)
def test_occlusion(self):
seen_occlusion = seen_not_occlusion = False
for seed in xrange(100):
if seen_occlusion and seen_not_occlusion:
break
self.world = universe.create_world('occlusion', seed=seed)
objects = [x for x in self.world.objects if x.name == 'basic']
if np.sum(np.abs(objects[0].position - objects[1].position)) <= 1.0:
seen_occlusion = True
# check that true class is correct
self.assertEqual(self.world.occlusion_true_class, 'OCCLUSION')
# check that we get a reward for correct classification and the
# episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_OCCLUSION')
self.assertEqual(reward, 99)
self.assertTrue(done)
# check that we get a penalty for incorrect classification and
# the episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_NOT_OCCLUSION')
self.assertEqual(reward, -101)
self.assertTrue(done)
# check that we can change the true class
objects[0].position = objects[1].position + (2, 0)
self.assertEqual(self.world.occlusion_true_class, 'NOT_OCCLUSION')
else:
seen_not_occlusion = True
# check that true class is correct
self.assertEqual(self.world.occlusion_true_class, 'NOT_OCCLUSION')
# check that we get a penalty for incorrect classification and
# the episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_OCCLUSION')
self.assertEqual(reward, -101)
self.assertTrue(done)
# check that we get a reward for correct classification and the
# episode terminates
obs, reward, done, info = self.world.step('CLASSIFY_NOT_OCCLUSION')
self.assertEqual(reward, 99)
self.assertTrue(done)
# check that we can change the true class
objects[0].position = objects[1].position
self.assertEqual(self.world.occlusion_true_class, 'OCCLUSION')
# check that we've seen both cases
self.assertTrue(seen_occlusion)
self.assertTrue(seen_not_occlusion)
def test_energy(self):
self.world = universe.create_world('mazes',
seed=0,
method='subdivide',
width=7,
height=7)
self.world.agent = agents.RandomAgent(self.world)
energy = self.world.energy
for _ in xrange(100):
self.world.step()
self.assertEqual(self.world.energy, energy)
def test_sword_usable(self):
# create the objects we want
screen = """
------------------
- -
X S* X
------------------
- -
- -
- -
- -
- -
------------------
"""
objects, width, height = h.world.screen(screen, pixelzuma.legend)
self.world = universe.create_world('pixelzuma',
objects=objects,
width=width,
height=height)
# give pedro the sword
self.world.objects['pedro'].inventory = ['SWORD']
# check that we get the rewards we expect and episode doesn't end
obs, reward, done, info = self.world.step('LEFT')
self.assertEqual(reward, 3000)
self.assertFalse(done)
obs, reward, done, info = self.world.step('LEFT')
self.assertEqual(reward, 0)
self.assertFalse(done)
obs, reward, done, info = self.world.step('LEFT')
self.assertEqual(reward, 0)
self.assertFalse(done)
obs, reward, done, info = self.world.step('LEFT')
self.assertEqual(reward, 0)
self.assertFalse(done)
# check that we didn't die
self.assertFalse(
any(
isinstance(event, pixelzuma.DeathEvent)
for event in self.world.events))
# check that we killed the spider
kill_events = [
event for event in self.world.events
if isinstance(event, pixelzuma.KillEvent)
]
self.assertEqual(len(kill_events), 1)
self.assertEqual(kill_events[0].type, 'SPIDER')
# check that we no longer have the sword
self.assertEqual(self.world.objects['pedro'].inventory, [])
def test_sometimes_robots_spawn_same(self):
# check that sometimes robots spawn on top of each other, leading to
# their deaths
robots_died = False
for _ in xrange(100):
self.world = universe.create_world('robots', width=8, height=8)
if not all(robot.alive for robot in self.world.objects['robot']):
robots_died = True
break
self.assertTrue(robots_died)
def test_bounce(self):
# create the obejcts we want
objects, height, width = h.world.screen(
"""
WWWW
W W
W*BW
WBBW
WPPW
""", block_breaker.legend)
self.world = universe.create_world('block_breaker',
objects=objects,
height=height,
width=width)
ball = self.world.objects['ball']
# point the ball up and to the right
ball.velocity = (-1.01, 1)
self.assertTrue(np.array_equal(ball.state_index, (2, 1)),
repr(ball.state_index))
# step and check ball position
obs, reward, done, info = self.world.step('NOOP')
self.assertTrue(np.array_equal(ball.state_index, (1, 2)))
# step and check ball position
obs, reward, done, info = self.world.step('NOOP')
self.assertTrue(np.array_equal(ball.state_index, (2, 1)))
# step and check ball position
obs, reward, done, info = self.world.step('NOOP')
self.assertTrue(np.array_equal(ball.state_index, (1, 2)))
# step and check ball position
obs, reward, done, info = self.world.step('NOOP')
self.assertTrue(np.array_equal(ball.state_index, (2, 1)))
# step and check ball position
obs, reward, done, info = self.world.step('NOOP')
self.assertTrue(np.array_equal(ball.state_index, (3, 2)))
# step and check ball position
obs, reward, done, info = self.world.step('NOOP')
self.assertTrue(np.array_equal(ball.state_index, (2, 1)))
# step and check ball position
obs, reward, done, info = self.world.step('NOOP')
self.assertTrue(np.array_equal(ball.state_index, (1, 2)))
def test_actions(self):
self.world = universe.create_world('occlusion', seed=0)
player = self.world.objects['classifier']
posn = player.position
# check that actions do what we expect
self.world.step('RIGHT')
self.assertTrue(np.array_equal(player.position, posn + (0, 1)))
self.world.step('DOWN')
self.assertTrue(np.array_equal(player.position, posn + (1, 1)))
self.world.step('LEFT')
self.assertTrue(np.array_equal(player.position, posn + (1, 0)))
self.world.step('UP')
self.assertTrue(np.array_equal(player.position, posn))
def test_walls_unpushable_and_goal_rewards(self):
self.world = universe.create_world('mazes',
seed=0,
method='subdivide',
width=7,
height=7)
self.world.remove_objects(self.world.objects['wall'])
self.world.remove_objects(self.world.objects['goal'])
objects, _, _ = h.world.screen(
"""
WWWWWWW
W W W
W W W
W WW
W W W
W W GW
WWWWWWW
""", self.world._legend)
self.world.create_objects(objects)
player = self.world.objects['self']
posn = player.position
# check that we can't push the walls
self.world.step('UP')
self.assertTrue(np.array_equal(player.position, posn))
self.world.step('LEFT')
self.assertTrue(np.array_equal(player.position, posn))
self.world.step('RIGHT')
self.assertTrue(np.array_equal(player.position, posn))
# solve the maze
self.world.step('DOWN')
self.world.step('DOWN')
self.world.step('RIGHT')
self.world.step('RIGHT')
self.world.step('RIGHT')
self.world.step('DOWN')
self.world.step('DOWN')
obs, reward, done, info = self.world.step('RIGHT')
# check that the episode terminated and we got a reward
self.assertTrue(done)
self.assertEqual(reward, 999)
def __init__(self, name, run=True, end_prompt=True, **kwargs):
kwargs['agent'] = core.Agent
print 'ran init'
self._name = name
self._end_prompt = end_prompt
#create the environment
start = time.clock()
self.world = universe.create_world(name,
defaults=self._defaults,
ignore_world_agent=True,
**kwargs)
end = time.clock()
print name, end - start, '???'
self.lag = end - start
def test_ghost_wall(self):
"""Test that ghosts cannot go through walls"""
objects, height, width = h.world.screen("""
XXX*
XBXX
XXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
blinky = self.world.objects['blinky']
posn = blinky.position
for _ in xrange(10):
obs, reward, done, info = self.world.step('NOOP')
# check that blinky didn't move
self.assertTrue(np.array_equal(blinky.position, posn))
def test_chomper_cannot_go_through_ghost(self):
"""Test that Chomper cannot go through a ghost"""
objects, height, width = h.world.screen("""
XXXX
XB*X
XXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
# point blinky right
blinky = self.world.objects['blinky']
blinky.orientation = 2
obs, reward, done, info = self.world.step('LEFT')
self.assertTrue(done)
self.assertEqual(reward, -1001)
def test_chomper_wall(self):
"""Check that Chomper can't go through walls"""
objects, height, width = h.world.screen("""
XXX
X*X
XXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
player = self.world.objects['chomper_player']
posn = player.position
for action in ['LEFT', 'UP', 'RIGHT', 'DOWN']:
obs, reward, done, info = self.world.step(action)
# check that we didn't move
self.assertTrue(np.array_equal(player.position, posn))
def test_clyde_choice(self):
"""Test that Clyde always makes the right choice when turning"""
objects, height, width = h.world.screen(
"""
XXXXXXXXXXXXXX
X X
XXXXXXXCXXXXXX
X *X
XXXXXXXXXXXXXX
""", chomper.legend)
self.world = universe.create_world('chomper',
objects=objects,
width=width,
height=height)
player = self.world.objects['chomper_player']
player.orientation = 0 # left
clyde = self.world.objects['clyde']
clyde.orientation = 3 # down
self.world.step('NOOP')
self.assertTrue(np.array_equal(clyde.position, (3, 7)),
repr(clyde.position))
self.world.step('NOOP')
self.assertTrue(np.array_equal(clyde.position, (3, 6)),
repr(clyde.position))
clyde.position = clyde.initial_position
clyde.orientation = 1 # up, so clyde will go down after flip
self.world.time = 29
self.world.step('NOOP')
self.assertTrue(np.array_equal(clyde.position, (3, 7)),
repr(clyde.position))
self.world.step('NOOP')
self.assertTrue(np.array_equal(clyde.position, (3, 6)),
repr(clyde.position))