1 files changed, 233 insertions, 0 deletions
diff --git a/lib/python2.7/test/test_abc.py b/lib/python2.7/test/test_abc.py
new file mode 100644
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+++ b/lib/python2.7/test/test_abc.py
@@ -0,0 +1,233 @@
+# 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()