diff options
Diffstat (limited to 'tests/functional/membership_protocol.py')
-rw-r--r-- | tests/functional/membership_protocol.py | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/tests/functional/membership_protocol.py b/tests/functional/membership_protocol.py new file mode 100644 index 000000000..3401f4bb4 --- /dev/null +++ b/tests/functional/membership_protocol.py @@ -0,0 +1,123 @@ +# pylint: disable=missing-docstring,pointless-statement,expression-not-assigned,too-few-public-methods,import-error,no-init,wrong-import-position,no-else-return, comparison-with-itself, useless-object-inheritance + +# standard types +1 in [1, 2, 3] +1 in {'a': 1, 'b': 2} +1 in {1, 2, 3} +1 in (1, 2, 3) +'1' in "123" +'1' in u"123" +'1' in bytearray(b"123") +1 in frozenset([1, 2, 3]) + +# comprehensions +1 in [x ** 2 % 10 for x in range(10)] +1 in {x ** 2 % 10 for x in range(10)} +1 in {x: x ** 2 % 10 for x in range(10)} + +# iterators +1 in iter([1, 2, 3]) + +# generator +def count(upto=float("inf")): + i = 0 + while True: + if i > upto: + break + yield i + i += 1 + +10 in count(upto=10) + +# custom instance +class UniversalContainer(object): + def __contains__(self, key): + return True + +42 in UniversalContainer() + +# custom iterable +class CustomIterable(object): + def __iter__(self): + return iter((1, 2, 3)) +3 in CustomIterable() + +# old-style iterable +class OldStyleIterable(object): + def __getitem__(self, key): + if key < 10: + return 2 ** key + else: + raise IndexError("bad index") +64 in OldStyleIterable() + +# do not emit warning if class has unknown bases +from some_missing_module import ImportedClass + +class MaybeIterable(ImportedClass): + pass + +10 in MaybeIterable() + +# do not emit warning inside mixins/abstract/base classes +class UsefulMixin(object): + stuff = None + + def get_stuff(self): + return self.stuff + + def act(self, thing): + stuff = self.get_stuff() + if thing in stuff: + pass + +class BaseThing(object): + valid_values = None + + def validate(self, value): + if self.valid_values is None: + return True + else: + # error should not be emitted here + return value in self.valid_values + +class AbstractThing(object): + valid_values = None + + def validate(self, value): + if self.valid_values is None: + return True + else: + # error should not be emitted here + return value in self.valid_values + +# class is not named as abstract +# but still is deduceably abstract +class Thing(object): + valid_values = None + + def __init__(self): + self._init_values() + + def validate(self, value): + if self.valid_values is None: + return True + else: + # error should not be emitted here + return value in self.valid_values + + def _init_values(self): + raise NotImplementedError + +# error cases +42 in 42 # [unsupported-membership-test] +42 not in None # [unsupported-membership-test] +42 in 8.5 # [unsupported-membership-test] + +class EmptyClass(object): + pass + +42 not in EmptyClass() # [unsupported-membership-test] +42 in EmptyClass # [unsupported-membership-test] +42 not in count # [unsupported-membership-test] +42 in range # [unsupported-membership-test] |