def test_apply (self):
# args
assert _apply(isint)([42,])
assert _apply(_all(isstring))(['jack', 'sawyer'])
assert _zip(isint, _apply(_all(isstring)))(42, ['jack', 'sawyer'])
# args + kwargs
assert _apply(_npos(exactly=2)([42, "bad robot!"],
{'jack': 4, 'kate': 15}))
assert _apply(_nkw(exactly=2)([42, "bad robot!"],
{'jack': 4, 'kate': 15}))
assert _apply(_nargs(exactly=4)([42, "bad robot!"],
{'jack': 4, 'kate': 15}))
# recursive (yeah, it makes my brain hurt, too...) It's
# actually pretty simple, though... It's equivalent to
# _and(isstring)(chain(people)) (in other words, it's a
# completely contrived example which is much more cleanly
# solved in another way! :-))
# apply `isstring` to each element in an iterable. I.e.,
# ``_apply(_all(isstring))(['jack', 'hurley'])`` is equivalent
# to ``_all(isstring)('jack', 'hurley')
all_strings = _apply(_all(isstring))
# make two groups of people, then combine them
group_1 = ['jack', 'sawyer']
group_2 = ['kate', 'hurley']
people = (group_1, group_2)
assert _apply(_zip(all_strings, all_strings))(people)
def test_apply_unexpected_kwargs (self):
_apply(isstring)(["bad robot!"], {'jack': 4, 'kate': 15})
def test_apply_too_many_args_for_predicate (self):
_apply(isint)([23, 42])
def test_apply_noniterable (self):
# this doesn't do what you think...
_apply(isint)(42)
