def test_equality():
"""Ensures that containers can be compared."""
assert Nothing is Nothing # noqa: WPS312
assert Nothing == _Nothing() == _Nothing(None)
assert Some(5) == Some(5)
assert hash(Some(1))
assert hash(Nothing)
def test_nonequality():
"""Ensures that containers are not compared to regular values."""
assert Nothing is not None
assert Nothing != None # noqa: E711
assert _Nothing(None) is not None
assert _Nothing(None) != None # noqa: E711
assert Some(5) != 5 and Some(3) is not Some(3)
def test_failure_immutable_deepcopy():
"""Ensures that Failure returns it self when passed to deepcopy function."""
nothing = _Nothing()
assert nothing is deepcopy(nothing)
def test_nothing_singleton():
"""Ensures `_Nothing` is a singleton."""
assert _Nothing() is _Nothing()
