self = <swh.objstorage.tests.test_objstorage_pathslicing.TestPathSlicingObjStorageLzma testMethod=test_types> def test_types(self): """Checks all methods of ObjStorageInterface are implemented by this backend, and that they have the same signature.""" # Create an instance of the protocol (which cannot be instantiated # directly, so this creates a subclass, then instantiates it) interface = type("_", (ObjStorageInterface,), {})() assert "get_batch" in dir(interface) missing_methods = [] for meth_name in dir(interface): if meth_name.startswith("_") and meth_name not in ( "__iter__", "__contains__", ): continue interface_meth = getattr(interface, meth_name) concrete_meth = getattr(self.storage, meth_name) expected_signature = inspect.signature(interface_meth) actual_signature = inspect.signature(concrete_meth) > assert expected_signature == actual_signature, meth_name E AssertionError: __iter__ E assert <Signature () -> Iterator[swh.objstorage.interface.CompositeObjId]> == <Signature () -> Iterator[bytes]> .tox/py3/lib/python3.7/site-packages/swh/objstorage/tests/objstorage_testing.py:37: AssertionError