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235 lines
7.6 KiB
235 lines
7.6 KiB
4 months ago
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# Copyright 2007 Google, Inc. All Rights Reserved.
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# Licensed to PSF under a Contributor Agreement.
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"""Unit tests for abc.py."""
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import unittest, weakref
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from test import test_support
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import abc
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from inspect import isabstract
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class TestABC(unittest.TestCase):
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def test_abstractmethod_basics(self):
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@abc.abstractmethod
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def foo(self): pass
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self.assertTrue(foo.__isabstractmethod__)
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def bar(self): pass
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self.assertFalse(hasattr(bar, "__isabstractmethod__"))
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def test_abstractproperty_basics(self):
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@abc.abstractproperty
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def foo(self): pass
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self.assertTrue(foo.__isabstractmethod__)
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def bar(self): pass
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self.assertFalse(hasattr(bar, "__isabstractmethod__"))
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class C:
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__metaclass__ = abc.ABCMeta
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@abc.abstractproperty
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def foo(self): return 3
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class D(C):
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@property
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def foo(self): return super(D, self).foo
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self.assertEqual(D().foo, 3)
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def test_abstractmethod_integration(self):
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for abstractthing in [abc.abstractmethod, abc.abstractproperty]:
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class C:
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__metaclass__ = abc.ABCMeta
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@abstractthing
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def foo(self): pass # abstract
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def bar(self): pass # concrete
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self.assertEqual(C.__abstractmethods__, set(["foo"]))
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self.assertRaises(TypeError, C) # because foo is abstract
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self.assertTrue(isabstract(C))
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class D(C):
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def bar(self): pass # concrete override of concrete
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self.assertEqual(D.__abstractmethods__, set(["foo"]))
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self.assertRaises(TypeError, D) # because foo is still abstract
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self.assertTrue(isabstract(D))
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class E(D):
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def foo(self): pass
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self.assertEqual(E.__abstractmethods__, set())
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E() # now foo is concrete, too
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self.assertFalse(isabstract(E))
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class F(E):
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@abstractthing
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def bar(self): pass # abstract override of concrete
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self.assertEqual(F.__abstractmethods__, set(["bar"]))
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self.assertRaises(TypeError, F) # because bar is abstract now
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self.assertTrue(isabstract(F))
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def test_subclass_oldstyle_class(self):
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class A:
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__metaclass__ = abc.ABCMeta
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class OldstyleClass:
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pass
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self.assertFalse(issubclass(OldstyleClass, A))
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self.assertFalse(issubclass(A, OldstyleClass))
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def test_isinstance_class(self):
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class A:
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__metaclass__ = abc.ABCMeta
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class OldstyleClass:
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pass
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self.assertFalse(isinstance(OldstyleClass, A))
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self.assertTrue(isinstance(OldstyleClass, type(OldstyleClass)))
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self.assertFalse(isinstance(A, OldstyleClass))
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# This raises a recursion depth error, but is low-priority:
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# self.assertTrue(isinstance(A, abc.ABCMeta))
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def test_registration_basics(self):
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class A:
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__metaclass__ = abc.ABCMeta
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class B(object):
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pass
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b = B()
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self.assertFalse(issubclass(B, A))
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self.assertFalse(issubclass(B, (A,)))
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self.assertNotIsInstance(b, A)
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self.assertNotIsInstance(b, (A,))
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A.register(B)
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self.assertTrue(issubclass(B, A))
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self.assertTrue(issubclass(B, (A,)))
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self.assertIsInstance(b, A)
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self.assertIsInstance(b, (A,))
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class C(B):
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pass
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c = C()
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self.assertTrue(issubclass(C, A))
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self.assertTrue(issubclass(C, (A,)))
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self.assertIsInstance(c, A)
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self.assertIsInstance(c, (A,))
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def test_isinstance_invalidation(self):
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class A:
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__metaclass__ = abc.ABCMeta
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class B(object):
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pass
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b = B()
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self.assertFalse(isinstance(b, A))
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self.assertFalse(isinstance(b, (A,)))
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A.register(B)
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self.assertTrue(isinstance(b, A))
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self.assertTrue(isinstance(b, (A,)))
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def test_registration_builtins(self):
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class A:
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__metaclass__ = abc.ABCMeta
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A.register(int)
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self.assertIsInstance(42, A)
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self.assertIsInstance(42, (A,))
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self.assertTrue(issubclass(int, A))
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self.assertTrue(issubclass(int, (A,)))
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class B(A):
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pass
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B.register(basestring)
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self.assertIsInstance("", A)
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self.assertIsInstance("", (A,))
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self.assertTrue(issubclass(str, A))
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self.assertTrue(issubclass(str, (A,)))
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def test_registration_edge_cases(self):
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class A:
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__metaclass__ = abc.ABCMeta
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A.register(A) # should pass silently
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class A1(A):
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pass
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self.assertRaises(RuntimeError, A1.register, A) # cycles not allowed
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class B(object):
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pass
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A1.register(B) # ok
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A1.register(B) # should pass silently
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class C(A):
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pass
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A.register(C) # should pass silently
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self.assertRaises(RuntimeError, C.register, A) # cycles not allowed
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C.register(B) # ok
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def test_register_non_class(self):
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class A(object):
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__metaclass__ = abc.ABCMeta
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self.assertRaisesRegexp(TypeError, "Can only register classes",
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A.register, 4)
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def test_registration_transitiveness(self):
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class A:
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__metaclass__ = abc.ABCMeta
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self.assertTrue(issubclass(A, A))
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self.assertTrue(issubclass(A, (A,)))
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class B:
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__metaclass__ = abc.ABCMeta
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self.assertFalse(issubclass(A, B))
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self.assertFalse(issubclass(A, (B,)))
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self.assertFalse(issubclass(B, A))
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self.assertFalse(issubclass(B, (A,)))
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class C:
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__metaclass__ = abc.ABCMeta
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A.register(B)
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class B1(B):
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pass
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self.assertTrue(issubclass(B1, A))
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self.assertTrue(issubclass(B1, (A,)))
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class C1(C):
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pass
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B1.register(C1)
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self.assertFalse(issubclass(C, B))
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self.assertFalse(issubclass(C, (B,)))
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self.assertFalse(issubclass(C, B1))
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self.assertFalse(issubclass(C, (B1,)))
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self.assertTrue(issubclass(C1, A))
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self.assertTrue(issubclass(C1, (A,)))
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self.assertTrue(issubclass(C1, B))
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self.assertTrue(issubclass(C1, (B,)))
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self.assertTrue(issubclass(C1, B1))
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self.assertTrue(issubclass(C1, (B1,)))
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C1.register(int)
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class MyInt(int):
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pass
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self.assertTrue(issubclass(MyInt, A))
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self.assertTrue(issubclass(MyInt, (A,)))
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self.assertIsInstance(42, A)
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self.assertIsInstance(42, (A,))
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def test_all_new_methods_are_called(self):
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class A:
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__metaclass__ = abc.ABCMeta
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class B(object):
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counter = 0
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def __new__(cls):
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B.counter += 1
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return super(B, cls).__new__(cls)
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class C(A, B):
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pass
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self.assertEqual(B.counter, 0)
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C()
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self.assertEqual(B.counter, 1)
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@test_support.requires_type_collecting
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def test_cache_leak(self):
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# See issue #2521.
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class A(object):
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def f(self):
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pass
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class C(A):
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def f(self):
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A.f(self)
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r = weakref.ref(C)
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# Trigger cache.
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C().f()
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del C
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test_support.gc_collect()
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self.assertEqual(r(), None)
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def test_main():
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test_support.run_unittest(TestABC)
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if __name__ == "__main__":
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unittest.main()
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