def test_test_constraint():
animals = ["dog", "cat"]
w1 = World(animals)
c1 = ("dog", "left of", "cat")
c2 = ("cat", "right of", "dog")
c3 = ("dog", "in front of", "cat")
c4 = ("cat", "in back of", "dog")
w1.set_position("dog", 1, 1)
w1.set_position("cat", 2, 2)
assert w1.test_constraint(c1)
assert w1.test_constraint(c2)
assert w1.test_constraint(c3)
assert w1.test_constraint(c4)
def test_set_position():
w1 = World()
w1.set_position("dog", 1, 1)
assert w1.animals["dog"].x == 1
assert w1.animals["dog"].y == 1
try:
w1.set_position("dog", 0, 0)
except Exception as e:
assert type(e) is ValueError
w2 = World(["dog"])
w2.set_position("dog", 1, 1)
assert w2.animals["dog"].x == 1
assert w2.animals["dog"].y == 1
w2.set_position("cat", 0, 0)
assert w2.animals["cat"].x == 0
assert w2.animals["cat"].y == 0
def test_copy():
w1 = World(["dog"])
w1.set_position("dog", 1, 1)
w2 = w1.copy()
assert w1 is not w2 # not the same object
assert str(w1) == str(w2) # but identical contents
