def test_bool():
assert bool(_empty) is False
empty = Empty()
assert bool(empty) is False
def test_id():
empty1 = Empty()
assert empty1 is _empty
assert id(empty1) == id(_empty)
def test_neq_empty_dict():
assert _empty != {}
empty = Empty()
assert empty != {}
def test_isinstance():
empty1 = Empty()
assert isinstance(empty1, Empty)
assert isinstance(_empty, Empty)
def test_neq_empty_list():
assert _empty != []
empty = Empty()
assert empty != []
def test_neq_none():
assert _empty is not None
empty = Empty()
assert empty is not None
def test_neq_false():
assert _empty != False
empty = Empty()
assert empty != False
def test_eq():
empty = Empty()
assert empty == _empty
def test_len():
assert len(_empty) == 0
empty = Empty()
assert len(empty) == 0