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test_inheritance_py37.py
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from __future__ import print_function
import unittest
import abc
import _py_abc
import wrapt
class TestClassInheritance(unittest.TestCase):
def test_basic_inheritance(self):
@wrapt.decorator
def wrapper(wrapped, instance, args, kwargs):
return wrapped(*args, **kwargs)
class B1:
def method(self):
pass
@wrapper
class C1(B1):
def method(self):
pass
class D1(C1):
def method(self):
pass
self.assertTrue(issubclass(B1, B1))
self.assertTrue(issubclass(C1, B1))
self.assertTrue(issubclass(D1, B1))
self.assertFalse(issubclass(B1, C1))
self.assertTrue(issubclass(C1, C1))
self.assertTrue(issubclass(D1, C1))
self.assertFalse(issubclass(B1, D1))
self.assertFalse(issubclass(C1, D1))
self.assertTrue(issubclass(D1, D1))
self.assertTrue(issubclass(B1, (B1, C1, D1)))
self.assertTrue(issubclass(C1, (B1, C1, D1)))
self.assertTrue(issubclass(D1, (B1, C1, D1)))
self.assertTrue(isinstance(C1(), B1))
self.assertTrue(isinstance(C1(), C1))
self.assertTrue(isinstance(D1(), B1))
self.assertTrue(isinstance(D1(), C1))
def function():
pass
class F(wrapt.FunctionWrapper):
pass
instance = F(function, wrapper)
self.assertTrue(isinstance(instance, wrapt.FunctionWrapper))
def test_abc_inheritance(self):
# XXX The checks commented out below all fail because the
# helpers for issubclass() via __subclasscheck__() in ABCMeta
# base class when C implementation is used does not support duck
# typing and will fail if the argument it is given is an object
# proxy like wrapt decorator uses. There is no known workaround
# for this problem.
#
# def __subclasscheck__(cls, subclass):
# """Override for issubclass(subclass, cls)."""
# > return _abc_subclasscheck(cls, subclass)
# E TypeError: issubclass() arg 1 must be a class
@wrapt.decorator
def wrapper(wrapped, instance, args, kwargs):
return wrapped(*args, **kwargs)
class A1(metaclass=abc.ABCMeta):
@abc.abstractmethod
def method(self):
pass
class B1(A1):
def method(self):
pass
@wrapper
class C1(B1):
def method(self):
pass
class D1(C1):
def method(self):
pass
self.assertTrue(issubclass(A1, A1))
self.assertTrue(issubclass(B1, A1))
# self.assertTrue(issubclass(C1, A1))
self.assertTrue(issubclass(D1, A1))
self.assertFalse(issubclass(A1, B1))
self.assertTrue(issubclass(B1, B1))
# self.assertTrue(issubclass(C1, B1))
self.assertTrue(issubclass(D1, B1))
self.assertFalse(issubclass(A1, C1))
self.assertFalse(issubclass(B1, C1))
self.assertTrue(issubclass(C1, C1))
self.assertTrue(issubclass(D1, C1))
self.assertFalse(issubclass(A1, D1))
self.assertFalse(issubclass(B1, D1))
# self.assertFalse(issubclass(C1, D1))
self.assertTrue(issubclass(D1, D1))
self.assertTrue(issubclass(A1, (A1, B1, C1, D1)))
self.assertTrue(issubclass(B1, (A1, B1, C1, D1)))
# self.assertTrue(issubclass(C1, (A1, B1, C1, D1)))
self.assertTrue(issubclass(D1, (A1, B1, C1, D1)))
self.assertTrue(isinstance(C1(), B1))
self.assertTrue(isinstance(C1(), C1))
self.assertTrue(isinstance(D1(), B1))
self.assertTrue(isinstance(D1(), C1))
def test_py_abc_inheritance(self):
# In contrast to above when C implementation for ABCMeta helpers
# are used, these all pass as have use the Python implementation
# instead.
@wrapt.decorator
def wrapper(wrapped, instance, args, kwargs):
return wrapped(*args, **kwargs)
class A1(metaclass=_py_abc.ABCMeta):
@abc.abstractmethod
def method(self):
pass
class B1(A1):
def method(self):
pass
@wrapper
class C1(B1):
def method(self):
pass
class D1(C1):
def method(self):
pass
self.assertTrue(issubclass(A1, A1))
self.assertTrue(issubclass(B1, A1))
self.assertTrue(issubclass(C1, A1))
self.assertTrue(issubclass(D1, A1))
self.assertFalse(issubclass(A1, B1))
self.assertTrue(issubclass(B1, B1))
self.assertTrue(issubclass(C1, B1))
self.assertTrue(issubclass(D1, B1))
self.assertFalse(issubclass(A1, C1))
self.assertFalse(issubclass(B1, C1))
self.assertTrue(issubclass(C1, C1))
self.assertTrue(issubclass(D1, C1))
self.assertFalse(issubclass(A1, D1))
self.assertFalse(issubclass(B1, D1))
self.assertFalse(issubclass(C1, D1))
self.assertTrue(issubclass(D1, D1))
self.assertTrue(issubclass(A1, (A1, B1, C1, D1)))
self.assertTrue(issubclass(B1, (A1, B1, C1, D1)))
self.assertTrue(issubclass(C1, (A1, B1, C1, D1)))
self.assertTrue(issubclass(D1, (A1, B1, C1, D1)))
self.assertTrue(isinstance(C1(), B1))
self.assertTrue(isinstance(C1(), C1))
self.assertTrue(isinstance(D1(), B1))
self.assertTrue(isinstance(D1(), C1))
if __name__ == '__main__':
unittest.main()