1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
# Copyright 2007 Google, Inc. All Rights Reserved.
# Licensed to PSF under a Contributor Agreement.
"""Unit tests for abc.py."""
import unittest
from test import 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().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__, {"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__, {"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__, {"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_registration_basics(self):
class A(metaclass=abc.ABCMeta):
pass
class B(object):
pass
b = B()
self.assertEqual(issubclass(B, A), False)
self.assertEqual(isinstance(b, A), False)
A.register(B)
self.assertEqual(issubclass(B, A), True)
self.assertEqual(isinstance(b, A), True)
class C(B):
pass
c = C()
self.assertEqual(issubclass(C, A), True)
self.assertEqual(isinstance(c, A), True)
def test_isinstance_invalidation(self):
class A(metaclass=abc.ABCMeta):
pass
class B:
pass
b = B()
self.assertEqual(isinstance(b, A), False)
A.register(B)
self.assertEqual(isinstance(b, A), True)
def test_registration_builtins(self):
class A(metaclass=abc.ABCMeta):
pass
A.register(int)
self.assertEqual(isinstance(42, A), True)
self.assertEqual(issubclass(int, A), True)
class B(A):
pass
B.register(str)
class C(str): pass
self.assertEqual(isinstance("", A), True)
self.assertEqual(issubclass(str, A), True)
self.assertEqual(issubclass(C, A), True)
def test_registration_edge_cases(self):
class A(metaclass=abc.ABCMeta):
pass
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):
pass
self.failUnless(issubclass(A, A))
class B(metaclass=abc.ABCMeta):
pass
self.failIf(issubclass(A, B))
self.failIf(issubclass(B, A))
class C(metaclass=abc.ABCMeta):
pass
A.register(B)
class B1(B):
pass
self.failUnless(issubclass(B1, A))
class C1(C):
pass
B1.register(C1)
self.failIf(issubclass(C, B))
self.failIf(issubclass(C, B1))
self.failUnless(issubclass(C1, A))
self.failUnless(issubclass(C1, B))
self.failUnless(issubclass(C1, B1))
C1.register(int)
class MyInt(int):
pass
self.failUnless(issubclass(MyInt, A))
self.failUnless(isinstance(42, A))
def test_all_new_methods_are_called(self):
class A(metaclass=abc.ABCMeta):
pass
class B(object):
counter = 0
def __new__(cls):
B.counter += 1
return super().__new__(cls)
class C(A, B):
pass
self.assertEqual(B.counter, 0)
C()
self.assertEqual(B.counter, 1)
def test_main():
support.run_unittest(TestABC)
if __name__ == "__main__":
unittest.main()
|
