def test_od_copy():
od = OrderedDiot()
od.i = 0
od2 = od.copy()
assert od2.i == 0
od2.j = 1
od3 = od.copy()
assert "j" not in od3
def test_inheritance_copy():
class Box2(Diot):
pass
b = Box2(a=1)
c = b.copy()
assert c == b
assert isinstance(c, Diot)
c = b.__copy__()
assert c == b
assert isinstance(c, Diot)
d = OrderedDiot()
d.b = 1
d.a = 0
d.x = 9
assert list(d.copy().keys()) == ['b', 'a', 'x']