def test_add_comp__2_kwargs():
e = Entity(x=0, y=1)
e.add_comp(a=1, b=2)
assert e.components['a'] == 1
assert e.components['b'] == 2
def test_add_comp__already_exists_and_replaces():
e = Entity(x=0, y=1)
e.add_comp(x=1)
e.add_comp(x=2)
assert e.components['x'] == 2
def test_add_comp__1_kwarg():
e = Entity(x=0)
e.add_comp(y=1)
assert e.components['y'] == 1