'Methods of the two interfaces all have the same signature.'

def test_same_signatures(self):

    def parts(method):
        return (method.positional, method.kwargs, method.required, method.varargs)
    names = list(IBlockDeviceAPI.names())
    self.assertItemsEqual(list((parts(IBlockDeviceAPI[name]) for name in names)), list((parts(IBlockDeviceAsyncAPI[name]) for name in names)))
