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-rw-r--r--lib/python2.7/test/test_abc.py233
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diff --git a/lib/python2.7/test/test_abc.py b/lib/python2.7/test/test_abc.py
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-# Copyright 2007 Google, Inc. All Rights Reserved.
-# Licensed to PSF under a Contributor Agreement.
-
-"""Unit tests for abc.py."""
-
-import unittest, weakref
-from test import test_support
-
-import abc
-from inspect import isabstract
-
-
-class TestABC(unittest.TestCase):
-
- def test_abstractmethod_basics(self):
- @abc.abstractmethod
- def foo(self): pass
- self.assertTrue(foo.__isabstractmethod__)
- def bar(self): pass
- self.assertFalse(hasattr(bar, "__isabstractmethod__"))
-
- def test_abstractproperty_basics(self):
- @abc.abstractproperty
- def foo(self): pass
- self.assertTrue(foo.__isabstractmethod__)
- def bar(self): pass
- self.assertFalse(hasattr(bar, "__isabstractmethod__"))
-
- class C:
- __metaclass__ = abc.ABCMeta
- @abc.abstractproperty
- def foo(self): return 3
- class D(C):
- @property
- def foo(self): return super(D, self).foo
- self.assertEqual(D().foo, 3)
-
- def test_abstractmethod_integration(self):
- for abstractthing in [abc.abstractmethod, abc.abstractproperty]:
- class C:
- __metaclass__ = abc.ABCMeta
- @abstractthing
- def foo(self): pass # abstract
- def bar(self): pass # concrete
- self.assertEqual(C.__abstractmethods__, set(["foo"]))
- self.assertRaises(TypeError, C) # because foo is abstract
- self.assertTrue(isabstract(C))
- class D(C):
- def bar(self): pass # concrete override of concrete
- self.assertEqual(D.__abstractmethods__, set(["foo"]))
- self.assertRaises(TypeError, D) # because foo is still abstract
- self.assertTrue(isabstract(D))
- class E(D):
- def foo(self): pass
- self.assertEqual(E.__abstractmethods__, set())
- E() # now foo is concrete, too
- self.assertFalse(isabstract(E))
- class F(E):
- @abstractthing
- def bar(self): pass # abstract override of concrete
- self.assertEqual(F.__abstractmethods__, set(["bar"]))
- self.assertRaises(TypeError, F) # because bar is abstract now
- self.assertTrue(isabstract(F))
-
- def test_subclass_oldstyle_class(self):
- class A:
- __metaclass__ = abc.ABCMeta
- class OldstyleClass:
- pass
- self.assertFalse(issubclass(OldstyleClass, A))
- self.assertFalse(issubclass(A, OldstyleClass))
-
- def test_isinstance_class(self):
- class A:
- __metaclass__ = abc.ABCMeta
- class OldstyleClass:
- pass
- self.assertFalse(isinstance(OldstyleClass, A))
- self.assertTrue(isinstance(OldstyleClass, type(OldstyleClass)))
- self.assertFalse(isinstance(A, OldstyleClass))
- # This raises a recursion depth error, but is low-priority:
- # self.assertTrue(isinstance(A, abc.ABCMeta))
-
- def test_registration_basics(self):
- class A:
- __metaclass__ = abc.ABCMeta
- class B(object):
- pass
- b = B()
- self.assertFalse(issubclass(B, A))
- self.assertFalse(issubclass(B, (A,)))
- self.assertNotIsInstance(b, A)
- self.assertNotIsInstance(b, (A,))
- A.register(B)
- self.assertTrue(issubclass(B, A))
- self.assertTrue(issubclass(B, (A,)))
- self.assertIsInstance(b, A)
- self.assertIsInstance(b, (A,))
- class C(B):
- pass
- c = C()
- self.assertTrue(issubclass(C, A))
- self.assertTrue(issubclass(C, (A,)))
- self.assertIsInstance(c, A)
- self.assertIsInstance(c, (A,))
-
- def test_isinstance_invalidation(self):
- class A:
- __metaclass__ = abc.ABCMeta
- class B(object):
- pass
- b = B()
- self.assertFalse(isinstance(b, A))
- self.assertFalse(isinstance(b, (A,)))
- A.register(B)
- self.assertTrue(isinstance(b, A))
- self.assertTrue(isinstance(b, (A,)))
-
- def test_registration_builtins(self):
- class A:
- __metaclass__ = abc.ABCMeta
- A.register(int)
- self.assertIsInstance(42, A)
- self.assertIsInstance(42, (A,))
- self.assertTrue(issubclass(int, A))
- self.assertTrue(issubclass(int, (A,)))
- class B(A):
- pass
- B.register(basestring)
- self.assertIsInstance("", A)
- self.assertIsInstance("", (A,))
- self.assertTrue(issubclass(str, A))
- self.assertTrue(issubclass(str, (A,)))
-
- def test_registration_edge_cases(self):
- class A:
- __metaclass__ = abc.ABCMeta
- A.register(A) # should pass silently
- class A1(A):
- pass
- self.assertRaises(RuntimeError, A1.register, A) # cycles not allowed
- class B(object):
- pass
- A1.register(B) # ok
- A1.register(B) # should pass silently
- class C(A):
- pass
- A.register(C) # should pass silently
- self.assertRaises(RuntimeError, C.register, A) # cycles not allowed
- C.register(B) # ok
-
- def test_register_non_class(self):
- class A(object):
- __metaclass__ = abc.ABCMeta
- self.assertRaisesRegexp(TypeError, "Can only register classes",
- A.register, 4)
-
- def test_registration_transitiveness(self):
- class A:
- __metaclass__ = abc.ABCMeta
- self.assertTrue(issubclass(A, A))
- self.assertTrue(issubclass(A, (A,)))
- class B:
- __metaclass__ = abc.ABCMeta
- self.assertFalse(issubclass(A, B))
- self.assertFalse(issubclass(A, (B,)))
- self.assertFalse(issubclass(B, A))
- self.assertFalse(issubclass(B, (A,)))
- class C:
- __metaclass__ = abc.ABCMeta
- A.register(B)
- class B1(B):
- pass
- self.assertTrue(issubclass(B1, A))
- self.assertTrue(issubclass(B1, (A,)))
- class C1(C):
- pass
- B1.register(C1)
- self.assertFalse(issubclass(C, B))
- self.assertFalse(issubclass(C, (B,)))
- self.assertFalse(issubclass(C, B1))
- self.assertFalse(issubclass(C, (B1,)))
- self.assertTrue(issubclass(C1, A))
- self.assertTrue(issubclass(C1, (A,)))
- self.assertTrue(issubclass(C1, B))
- self.assertTrue(issubclass(C1, (B,)))
- self.assertTrue(issubclass(C1, B1))
- self.assertTrue(issubclass(C1, (B1,)))
- C1.register(int)
- class MyInt(int):
- pass
- self.assertTrue(issubclass(MyInt, A))
- self.assertTrue(issubclass(MyInt, (A,)))
- self.assertIsInstance(42, A)
- self.assertIsInstance(42, (A,))
-
- def test_all_new_methods_are_called(self):
- class A:
- __metaclass__ = abc.ABCMeta
- class B(object):
- counter = 0
- def __new__(cls):
- B.counter += 1
- return super(B, cls).__new__(cls)
- class C(A, B):
- pass
- self.assertEqual(B.counter, 0)
- C()
- self.assertEqual(B.counter, 1)
-
- def test_cache_leak(self):
- # See issue #2521.
- class A(object):
- __metaclass__ = abc.ABCMeta
- @abc.abstractmethod
- def f(self):
- pass
- class C(A):
- def f(self):
- A.f(self)
- r = weakref.ref(C)
- # Trigger cache.
- C().f()
- del C
- test_support.gc_collect()
- self.assertEqual(r(), None)
-
-def test_main():
- test_support.run_unittest(TestABC)
-
-
-if __name__ == "__main__":
- unittest.main()