def test_Just_iter():
obj = object()
assert list(Just(obj)) == [obj]
def test_Just_add_monoid_empty():
obj = object()
value = Just(obj)
assert value + mempty(value) == value
def test_Just_repr_conatins_subobject():
obj = object()
assert repr(obj) in repr(Just(obj))
def test_Just_add_Nothing():
obj = object()
assert Just(obj) + Nothing() == Just(obj)
def test_Just_add_Just():
assert Just([1]) + Just([2]) == Just([1, 2])
def test_IsomorphismLens_unpack():
assert b.Isomorphism(int, str).unpack('1') == Just(1)
def test_Nothing_fromiter():
assert lenses.setter.fromiter(Just(1), []) == Nothing()
def test_Just_equals_Just_when_subobjects_equal():
# maybe hypothesis can make this more rigourous
obj1 = object()
obj2 = object()
assert (Just(obj1) == Just(obj2)) is bool(obj1 == obj2)
def test_Just_not_equals_Nothing():
assert Just(object()) != Nothing()
def test_Nothing_from_iter():
assert lenses.hooks.from_iter(Just(1), []) == Nothing()
def test_Nothing_not_equals_Just():
assert Nothing() != Just(object())
def test_Nothing_add_Just():
obj = object()
assert Nothing() + Just(obj) == Just(obj)
def test_Just_unwrap():
obj = object()
assert Just(obj).unwrap() is obj
def test_Just_fromiter():
obj = object()
assert lenses.setter.fromiter(Nothing(), [obj]) == Just(obj)
def test_Just_from_iter():
obj = object()
assert lenses.hooks.from_iter(Nothing(), [obj]) == Just(obj)
def test_Just_not_equals_object():
obj = object
assert Just(obj) != obj
def test_Just_maybe():
obj = object()
assert Just(obj).maybe() is obj
def test_Just_map():
assert Just(1).map(str) == Just(str(1))
def test_prism_folder_success():
obj = object
assert list(b.JustPrism().folder(Just(obj))) == [obj]
def test_traversal_just_using_identity():
assert tc.traverse(Just(1), ident) == Identity(Just(4))