def test_Just_add_Nothing():
obj = object()
assert Just(obj) + Nothing() == Just(obj)
def test_Nothing_map():
assert Nothing().map(str) == Nothing()
def test_Nothing_unwrap():
with pytest.raises(ValueError):
Nothing().unwrap()
def test_Just_not_equals_Nothing():
assert Just(object()) != Nothing()
def test_Nothing_not_equals_Just():
assert Nothing() != Just(object())
def test_Nothing_maybe():
obj = object()
assert Nothing().maybe() == None
def test_Nothing_iter():
assert list(Nothing()) == []
def test_Nothing_fromiter():
assert lenses.setter.fromiter(Just(1), []) == Nothing()
def test_Nothing_add_Just():
obj = object()
assert Nothing() + Just(obj) == Just(obj)
def test_Nothing_repr_invariant():
assert repr(Nothing()) == repr(Nothing())
def test_Nothing_add_Nothing():
assert Nothing() + Nothing() == Nothing()
def test_Just_fromiter():
obj = object()
assert lenses.setter.fromiter(Nothing(), [obj]) == Just(obj)
def test_Nothing_is_singleton():
assert Nothing() is Nothing()
def test_Just_from_iter():
obj = object()
assert lenses.hooks.from_iter(Nothing(), [obj]) == Just(obj)
def test_Nothing_from_iter():
assert lenses.hooks.from_iter(Just(1), []) == Nothing()
def test_prism_folder_failure():
assert list(b.JustPrism().folder(Nothing())) == []
def test_traversal_nothing_using_identity():
assert tc.traverse(Nothing(), ident) == Identity(Nothing())