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v0.5.1
v0.5.1
swh:1:snp:635f4099902912592851108bcac178ff574f7c5f
Tip revision: 74f4bd53e03ded8408bcc2de67cf0f5a4ac5b1a1 authored by Barry Warsaw on 23 February 2012, 15:59:38 UTC
Bump some more copyright years (as per PEP 101), since this is the first
Bump some more copyright years (as per PEP 101), since this is the first
Tip revision: 74f4bd5
test_abc.py
# Copyright 2007 Google, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.
"""Unit tests for abc.py."""
import unittest
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.assertEqual(foo.__isabstractmethod__, True)
def bar(self): pass
self.assertEqual(hasattr(bar, "__isabstractmethod__"), False)
def test_abstractproperty_basics(self):
@abc.abstractproperty
def foo(self): pass
self.assertEqual(foo.__isabstractmethod__, True)
def bar(self): pass
self.assertEqual(hasattr(bar, "__isabstractmethod__"), False)
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.assert_(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.assert_(isabstract(D))
class E(D):
def foo(self): pass
self.assertEqual(E.__abstractmethods__, set())
E() # now foo is concrete, too
self.failIf(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.assert_(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.assertEqual(issubclass(B, A), False)
self.assertEqual(issubclass(B, (A,)), False)
self.assertEqual(isinstance(b, A), False)
self.assertEqual(isinstance(b, (A,)), False)
A.register(B)
self.assertEqual(issubclass(B, A), True)
self.assertEqual(issubclass(B, (A,)), True)
self.assertEqual(isinstance(b, A), True)
self.assertEqual(isinstance(b, (A,)), True)
class C(B):
pass
c = C()
self.assertEqual(issubclass(C, A), True)
self.assertEqual(issubclass(C, (A,)), True)
self.assertEqual(isinstance(c, A), True)
self.assertEqual(isinstance(c, (A,)), True)
def test_isinstance_invalidation(self):
class A:
__metaclass__ = abc.ABCMeta
class B(object):
pass
b = B()
self.assertEqual(isinstance(b, A), False)
self.assertEqual(isinstance(b, (A,)), False)
A.register(B)
self.assertEqual(isinstance(b, A), True)
self.assertEqual(isinstance(b, (A,)), True)
def test_registration_builtins(self):
class A:
__metaclass__ = abc.ABCMeta
A.register(int)
self.assertEqual(isinstance(42, A), True)
self.assertEqual(isinstance(42, (A,)), True)
self.assertEqual(issubclass(int, A), True)
self.assertEqual(issubclass(int, (A,)), True)
class B(A):
pass
B.register(basestring)
self.assertEqual(isinstance("", A), True)
self.assertEqual(isinstance("", (A,)), True)
self.assertEqual(issubclass(str, A), True)
self.assertEqual(issubclass(str, (A,)), True)
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_registration_transitiveness(self):
class A:
__metaclass__ = abc.ABCMeta
self.failUnless(issubclass(A, A))
self.failUnless(issubclass(A, (A,)))
class B:
__metaclass__ = abc.ABCMeta
self.failIf(issubclass(A, B))
self.failIf(issubclass(A, (B,)))
self.failIf(issubclass(B, A))
self.failIf(issubclass(B, (A,)))
class C:
__metaclass__ = abc.ABCMeta
A.register(B)
class B1(B):
pass
self.failUnless(issubclass(B1, A))
self.failUnless(issubclass(B1, (A,)))
class C1(C):
pass
B1.register(C1)
self.failIf(issubclass(C, B))
self.failIf(issubclass(C, (B,)))
self.failIf(issubclass(C, B1))
self.failIf(issubclass(C, (B1,)))
self.failUnless(issubclass(C1, A))
self.failUnless(issubclass(C1, (A,)))
self.failUnless(issubclass(C1, B))
self.failUnless(issubclass(C1, (B,)))
self.failUnless(issubclass(C1, B1))
self.failUnless(issubclass(C1, (B1,)))
C1.register(int)
class MyInt(int):
pass
self.failUnless(issubclass(MyInt, A))
self.failUnless(issubclass(MyInt, (A,)))
self.failUnless(isinstance(42, A))
self.failUnless(isinstance(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_main():
test_support.run_unittest(TestABC)
if __name__ == "__main__":
unittest.main()