Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 1 | # Copyright 2007 Google, Inc. All Rights Reserved. |
| 2 | # Licensed to PSF under a Contributor Agreement. |
| 3 | |
| 4 | """Unit tests for abc.py.""" |
| 5 | |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 6 | import unittest |
Benjamin Peterson | ee8712c | 2008-05-20 21:35:26 +0000 | [diff] [blame] | 7 | from test import support |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 8 | |
| 9 | import abc |
Christian Heimes | be5b30b | 2008-03-03 19:18:51 +0000 | [diff] [blame] | 10 | from inspect import isabstract |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 11 | |
| 12 | |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 13 | class TestLegacyAPI(unittest.TestCase): |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 14 | |
Guido van Rossum | 70d2b89 | 2007-08-01 17:52:23 +0000 | [diff] [blame] | 15 | def test_abstractproperty_basics(self): |
| 16 | @abc.abstractproperty |
| 17 | def foo(self): pass |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 18 | self.assertTrue(foo.__isabstractmethod__) |
Guido van Rossum | 70d2b89 | 2007-08-01 17:52:23 +0000 | [diff] [blame] | 19 | def bar(self): pass |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 20 | self.assertFalse(hasattr(bar, "__isabstractmethod__")) |
Guido van Rossum | 70d2b89 | 2007-08-01 17:52:23 +0000 | [diff] [blame] | 21 | |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 22 | class C(metaclass=abc.ABCMeta): |
Guido van Rossum | 70d2b89 | 2007-08-01 17:52:23 +0000 | [diff] [blame] | 23 | @abc.abstractproperty |
| 24 | def foo(self): return 3 |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 25 | self.assertRaises(TypeError, C) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 26 | class D(C): |
Guido van Rossum | 70d2b89 | 2007-08-01 17:52:23 +0000 | [diff] [blame] | 27 | @property |
| 28 | def foo(self): return super().foo |
| 29 | self.assertEqual(D().foo, 3) |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 30 | self.assertFalse(getattr(D.foo, "__isabstractmethod__", False)) |
Guido van Rossum | 70d2b89 | 2007-08-01 17:52:23 +0000 | [diff] [blame] | 31 | |
Benjamin Peterson | 45c257f | 2010-08-17 00:52:52 +0000 | [diff] [blame] | 32 | def test_abstractclassmethod_basics(self): |
| 33 | @abc.abstractclassmethod |
| 34 | def foo(cls): pass |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 35 | self.assertTrue(foo.__isabstractmethod__) |
Benjamin Peterson | 45c257f | 2010-08-17 00:52:52 +0000 | [diff] [blame] | 36 | @classmethod |
| 37 | def bar(cls): pass |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 38 | self.assertFalse(getattr(bar, "__isabstractmethod__", False)) |
Benjamin Peterson | 45c257f | 2010-08-17 00:52:52 +0000 | [diff] [blame] | 39 | |
| 40 | class C(metaclass=abc.ABCMeta): |
| 41 | @abc.abstractclassmethod |
| 42 | def foo(cls): return cls.__name__ |
| 43 | self.assertRaises(TypeError, C) |
| 44 | class D(C): |
| 45 | @classmethod |
| 46 | def foo(cls): return super().foo() |
| 47 | self.assertEqual(D.foo(), 'D') |
| 48 | self.assertEqual(D().foo(), 'D') |
| 49 | |
| 50 | def test_abstractstaticmethod_basics(self): |
| 51 | @abc.abstractstaticmethod |
| 52 | def foo(): pass |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 53 | self.assertTrue(foo.__isabstractmethod__) |
Benjamin Peterson | 45c257f | 2010-08-17 00:52:52 +0000 | [diff] [blame] | 54 | @staticmethod |
| 55 | def bar(): pass |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 56 | self.assertFalse(getattr(bar, "__isabstractmethod__", False)) |
Benjamin Peterson | 45c257f | 2010-08-17 00:52:52 +0000 | [diff] [blame] | 57 | |
| 58 | class C(metaclass=abc.ABCMeta): |
| 59 | @abc.abstractstaticmethod |
| 60 | def foo(): return 3 |
| 61 | self.assertRaises(TypeError, C) |
| 62 | class D(C): |
| 63 | @staticmethod |
| 64 | def foo(): return 4 |
| 65 | self.assertEqual(D.foo(), 4) |
| 66 | self.assertEqual(D().foo(), 4) |
| 67 | |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 68 | |
| 69 | class TestABC(unittest.TestCase): |
| 70 | |
Andrew Svetlov | b67596d | 2012-12-13 19:09:33 +0200 | [diff] [blame] | 71 | def test_ABC_helper(self): |
| 72 | # create an ABC using the helper class and perform basic checks |
| 73 | class C(abc.ABC): |
| 74 | @classmethod |
| 75 | @abc.abstractmethod |
| 76 | def foo(cls): return cls.__name__ |
| 77 | self.assertEqual(type(C), abc.ABCMeta) |
| 78 | self.assertRaises(TypeError, C) |
| 79 | class D(C): |
| 80 | @classmethod |
| 81 | def foo(cls): return super().foo() |
| 82 | self.assertEqual(D.foo(), 'D') |
| 83 | |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 84 | def test_abstractmethod_basics(self): |
| 85 | @abc.abstractmethod |
| 86 | def foo(self): pass |
| 87 | self.assertTrue(foo.__isabstractmethod__) |
| 88 | def bar(self): pass |
| 89 | self.assertFalse(hasattr(bar, "__isabstractmethod__")) |
| 90 | |
| 91 | def test_abstractproperty_basics(self): |
| 92 | @property |
| 93 | @abc.abstractmethod |
| 94 | def foo(self): pass |
| 95 | self.assertTrue(foo.__isabstractmethod__) |
| 96 | def bar(self): pass |
| 97 | self.assertFalse(getattr(bar, "__isabstractmethod__", False)) |
| 98 | |
| 99 | class C(metaclass=abc.ABCMeta): |
| 100 | @property |
| 101 | @abc.abstractmethod |
| 102 | def foo(self): return 3 |
| 103 | self.assertRaises(TypeError, C) |
| 104 | class D(C): |
| 105 | @C.foo.getter |
| 106 | def foo(self): return super().foo |
| 107 | self.assertEqual(D().foo, 3) |
| 108 | |
| 109 | def test_abstractclassmethod_basics(self): |
| 110 | @classmethod |
| 111 | @abc.abstractmethod |
| 112 | def foo(cls): pass |
| 113 | self.assertTrue(foo.__isabstractmethod__) |
| 114 | @classmethod |
| 115 | def bar(cls): pass |
| 116 | self.assertFalse(getattr(bar, "__isabstractmethod__", False)) |
| 117 | |
| 118 | class C(metaclass=abc.ABCMeta): |
| 119 | @classmethod |
| 120 | @abc.abstractmethod |
| 121 | def foo(cls): return cls.__name__ |
| 122 | self.assertRaises(TypeError, C) |
| 123 | class D(C): |
| 124 | @classmethod |
| 125 | def foo(cls): return super().foo() |
| 126 | self.assertEqual(D.foo(), 'D') |
| 127 | self.assertEqual(D().foo(), 'D') |
| 128 | |
| 129 | def test_abstractstaticmethod_basics(self): |
| 130 | @staticmethod |
| 131 | @abc.abstractmethod |
| 132 | def foo(): pass |
| 133 | self.assertTrue(foo.__isabstractmethod__) |
| 134 | @staticmethod |
| 135 | def bar(): pass |
| 136 | self.assertFalse(getattr(bar, "__isabstractmethod__", False)) |
| 137 | |
| 138 | class C(metaclass=abc.ABCMeta): |
| 139 | @staticmethod |
| 140 | @abc.abstractmethod |
| 141 | def foo(): return 3 |
| 142 | self.assertRaises(TypeError, C) |
| 143 | class D(C): |
| 144 | @staticmethod |
| 145 | def foo(): return 4 |
| 146 | self.assertEqual(D.foo(), 4) |
| 147 | self.assertEqual(D().foo(), 4) |
| 148 | |
| 149 | def test_abstractmethod_integration(self): |
| 150 | for abstractthing in [abc.abstractmethod, abc.abstractproperty, |
| 151 | abc.abstractclassmethod, |
| 152 | abc.abstractstaticmethod]: |
| 153 | class C(metaclass=abc.ABCMeta): |
| 154 | @abstractthing |
| 155 | def foo(self): pass # abstract |
| 156 | def bar(self): pass # concrete |
| 157 | self.assertEqual(C.__abstractmethods__, {"foo"}) |
| 158 | self.assertRaises(TypeError, C) # because foo is abstract |
| 159 | self.assertTrue(isabstract(C)) |
| 160 | class D(C): |
| 161 | def bar(self): pass # concrete override of concrete |
| 162 | self.assertEqual(D.__abstractmethods__, {"foo"}) |
| 163 | self.assertRaises(TypeError, D) # because foo is still abstract |
| 164 | self.assertTrue(isabstract(D)) |
| 165 | class E(D): |
| 166 | def foo(self): pass |
| 167 | self.assertEqual(E.__abstractmethods__, set()) |
| 168 | E() # now foo is concrete, too |
| 169 | self.assertFalse(isabstract(E)) |
| 170 | class F(E): |
| 171 | @abstractthing |
| 172 | def bar(self): pass # abstract override of concrete |
| 173 | self.assertEqual(F.__abstractmethods__, {"bar"}) |
| 174 | self.assertRaises(TypeError, F) # because bar is abstract now |
| 175 | self.assertTrue(isabstract(F)) |
| 176 | |
| 177 | def test_descriptors_with_abstractmethod(self): |
| 178 | class C(metaclass=abc.ABCMeta): |
| 179 | @property |
| 180 | @abc.abstractmethod |
| 181 | def foo(self): return 3 |
| 182 | @foo.setter |
| 183 | @abc.abstractmethod |
| 184 | def foo(self, val): pass |
| 185 | self.assertRaises(TypeError, C) |
| 186 | class D(C): |
| 187 | @C.foo.getter |
| 188 | def foo(self): return super().foo |
| 189 | self.assertRaises(TypeError, D) |
| 190 | class E(D): |
| 191 | @D.foo.setter |
| 192 | def foo(self, val): pass |
| 193 | self.assertEqual(E().foo, 3) |
| 194 | # check that the property's __isabstractmethod__ descriptor does the |
| 195 | # right thing when presented with a value that fails truth testing: |
| 196 | class NotBool(object): |
Serhiy Storchaka | a60c2fe | 2015-03-12 21:56:08 +0200 | [diff] [blame] | 197 | def __bool__(self): |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 198 | raise ValueError() |
Serhiy Storchaka | a60c2fe | 2015-03-12 21:56:08 +0200 | [diff] [blame] | 199 | __len__ = __bool__ |
Benjamin Peterson | bfebb7b | 2011-12-15 15:34:02 -0500 | [diff] [blame] | 200 | with self.assertRaises(ValueError): |
| 201 | class F(C): |
| 202 | def bar(self): |
| 203 | pass |
| 204 | bar.__isabstractmethod__ = NotBool() |
| 205 | foo = property(bar) |
| 206 | |
| 207 | |
| 208 | def test_customdescriptors_with_abstractmethod(self): |
| 209 | class Descriptor: |
| 210 | def __init__(self, fget, fset=None): |
| 211 | self._fget = fget |
| 212 | self._fset = fset |
| 213 | def getter(self, callable): |
| 214 | return Descriptor(callable, self._fget) |
| 215 | def setter(self, callable): |
| 216 | return Descriptor(self._fget, callable) |
| 217 | @property |
| 218 | def __isabstractmethod__(self): |
| 219 | return (getattr(self._fget, '__isabstractmethod__', False) |
| 220 | or getattr(self._fset, '__isabstractmethod__', False)) |
| 221 | class C(metaclass=abc.ABCMeta): |
| 222 | @Descriptor |
| 223 | @abc.abstractmethod |
| 224 | def foo(self): return 3 |
| 225 | @foo.setter |
| 226 | @abc.abstractmethod |
| 227 | def foo(self, val): pass |
| 228 | self.assertRaises(TypeError, C) |
| 229 | class D(C): |
| 230 | @C.foo.getter |
| 231 | def foo(self): return super().foo |
| 232 | self.assertRaises(TypeError, D) |
| 233 | class E(D): |
| 234 | @D.foo.setter |
| 235 | def foo(self, val): pass |
| 236 | self.assertFalse(E.foo.__isabstractmethod__) |
| 237 | |
Benjamin Peterson | 970d188 | 2010-10-02 17:55:47 +0000 | [diff] [blame] | 238 | def test_metaclass_abc(self): |
| 239 | # Metaclasses can be ABCs, too. |
| 240 | class A(metaclass=abc.ABCMeta): |
| 241 | @abc.abstractmethod |
| 242 | def x(self): |
| 243 | pass |
| 244 | self.assertEqual(A.__abstractmethods__, {"x"}) |
| 245 | class meta(type, A): |
| 246 | def x(self): |
| 247 | return 1 |
| 248 | class C(metaclass=meta): |
| 249 | pass |
| 250 | |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 251 | def test_registration_basics(self): |
| 252 | class A(metaclass=abc.ABCMeta): |
| 253 | pass |
Christian Heimes | 043d6f6 | 2008-01-07 17:19:16 +0000 | [diff] [blame] | 254 | class B(object): |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 255 | pass |
| 256 | b = B() |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 257 | self.assertFalse(issubclass(B, A)) |
| 258 | self.assertFalse(issubclass(B, (A,))) |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 259 | self.assertNotIsInstance(b, A) |
| 260 | self.assertNotIsInstance(b, (A,)) |
Éric Araujo | 6c3787c | 2011-02-24 18:03:10 +0000 | [diff] [blame] | 261 | B1 = A.register(B) |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 262 | self.assertTrue(issubclass(B, A)) |
| 263 | self.assertTrue(issubclass(B, (A,))) |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 264 | self.assertIsInstance(b, A) |
| 265 | self.assertIsInstance(b, (A,)) |
Éric Araujo | 6c3787c | 2011-02-24 18:03:10 +0000 | [diff] [blame] | 266 | self.assertIs(B1, B) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 267 | class C(B): |
| 268 | pass |
| 269 | c = C() |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 270 | self.assertTrue(issubclass(C, A)) |
| 271 | self.assertTrue(issubclass(C, (A,))) |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 272 | self.assertIsInstance(c, A) |
| 273 | self.assertIsInstance(c, (A,)) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 274 | |
Éric Araujo | 6c3787c | 2011-02-24 18:03:10 +0000 | [diff] [blame] | 275 | def test_register_as_class_deco(self): |
| 276 | class A(metaclass=abc.ABCMeta): |
| 277 | pass |
| 278 | @A.register |
| 279 | class B(object): |
| 280 | pass |
| 281 | b = B() |
| 282 | self.assertTrue(issubclass(B, A)) |
| 283 | self.assertTrue(issubclass(B, (A,))) |
| 284 | self.assertIsInstance(b, A) |
| 285 | self.assertIsInstance(b, (A,)) |
| 286 | @A.register |
| 287 | class C(B): |
| 288 | pass |
| 289 | c = C() |
| 290 | self.assertTrue(issubclass(C, A)) |
| 291 | self.assertTrue(issubclass(C, (A,))) |
| 292 | self.assertIsInstance(c, A) |
| 293 | self.assertIsInstance(c, (A,)) |
| 294 | self.assertIs(C, A.register(C)) |
| 295 | |
Christian Heimes | 68f5fbe | 2008-02-14 08:27:37 +0000 | [diff] [blame] | 296 | def test_isinstance_invalidation(self): |
| 297 | class A(metaclass=abc.ABCMeta): |
| 298 | pass |
| 299 | class B: |
| 300 | pass |
| 301 | b = B() |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 302 | self.assertFalse(isinstance(b, A)) |
| 303 | self.assertFalse(isinstance(b, (A,))) |
Łukasz Langa | eadd8cf | 2013-05-25 18:41:50 +0200 | [diff] [blame] | 304 | token_old = abc.get_cache_token() |
Christian Heimes | 68f5fbe | 2008-02-14 08:27:37 +0000 | [diff] [blame] | 305 | A.register(B) |
Łukasz Langa | eadd8cf | 2013-05-25 18:41:50 +0200 | [diff] [blame] | 306 | token_new = abc.get_cache_token() |
| 307 | self.assertNotEqual(token_old, token_new) |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 308 | self.assertTrue(isinstance(b, A)) |
| 309 | self.assertTrue(isinstance(b, (A,))) |
Christian Heimes | 68f5fbe | 2008-02-14 08:27:37 +0000 | [diff] [blame] | 310 | |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 311 | def test_registration_builtins(self): |
| 312 | class A(metaclass=abc.ABCMeta): |
| 313 | pass |
| 314 | A.register(int) |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 315 | self.assertIsInstance(42, A) |
| 316 | self.assertIsInstance(42, (A,)) |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 317 | self.assertTrue(issubclass(int, A)) |
| 318 | self.assertTrue(issubclass(int, (A,))) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 319 | class B(A): |
| 320 | pass |
Guido van Rossum | 3172c5d | 2007-10-16 18:12:55 +0000 | [diff] [blame] | 321 | B.register(str) |
| 322 | class C(str): pass |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 323 | self.assertIsInstance("", A) |
| 324 | self.assertIsInstance("", (A,)) |
Benjamin Peterson | 83cd3b9 | 2010-08-17 01:07:53 +0000 | [diff] [blame] | 325 | self.assertTrue(issubclass(str, A)) |
| 326 | self.assertTrue(issubclass(str, (A,))) |
| 327 | self.assertTrue(issubclass(C, A)) |
| 328 | self.assertTrue(issubclass(C, (A,))) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 329 | |
| 330 | def test_registration_edge_cases(self): |
| 331 | class A(metaclass=abc.ABCMeta): |
| 332 | pass |
| 333 | A.register(A) # should pass silently |
| 334 | class A1(A): |
| 335 | pass |
| 336 | self.assertRaises(RuntimeError, A1.register, A) # cycles not allowed |
Christian Heimes | 043d6f6 | 2008-01-07 17:19:16 +0000 | [diff] [blame] | 337 | class B(object): |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 338 | pass |
| 339 | A1.register(B) # ok |
| 340 | A1.register(B) # should pass silently |
| 341 | class C(A): |
| 342 | pass |
| 343 | A.register(C) # should pass silently |
| 344 | self.assertRaises(RuntimeError, C.register, A) # cycles not allowed |
| 345 | C.register(B) # ok |
| 346 | |
Benjamin Peterson | d632664 | 2010-01-27 02:25:58 +0000 | [diff] [blame] | 347 | def test_register_non_class(self): |
| 348 | class A(metaclass=abc.ABCMeta): |
| 349 | pass |
Ezio Melotti | ed3a7d2 | 2010-12-01 02:32:32 +0000 | [diff] [blame] | 350 | self.assertRaisesRegex(TypeError, "Can only register classes", |
| 351 | A.register, 4) |
Benjamin Peterson | d632664 | 2010-01-27 02:25:58 +0000 | [diff] [blame] | 352 | |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 353 | def test_registration_transitiveness(self): |
| 354 | class A(metaclass=abc.ABCMeta): |
| 355 | pass |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 356 | self.assertTrue(issubclass(A, A)) |
| 357 | self.assertTrue(issubclass(A, (A,))) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 358 | class B(metaclass=abc.ABCMeta): |
| 359 | pass |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 360 | self.assertFalse(issubclass(A, B)) |
| 361 | self.assertFalse(issubclass(A, (B,))) |
| 362 | self.assertFalse(issubclass(B, A)) |
| 363 | self.assertFalse(issubclass(B, (A,))) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 364 | class C(metaclass=abc.ABCMeta): |
| 365 | pass |
| 366 | A.register(B) |
| 367 | class B1(B): |
| 368 | pass |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 369 | self.assertTrue(issubclass(B1, A)) |
| 370 | self.assertTrue(issubclass(B1, (A,))) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 371 | class C1(C): |
| 372 | pass |
| 373 | B1.register(C1) |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 374 | self.assertFalse(issubclass(C, B)) |
| 375 | self.assertFalse(issubclass(C, (B,))) |
| 376 | self.assertFalse(issubclass(C, B1)) |
| 377 | self.assertFalse(issubclass(C, (B1,))) |
| 378 | self.assertTrue(issubclass(C1, A)) |
| 379 | self.assertTrue(issubclass(C1, (A,))) |
| 380 | self.assertTrue(issubclass(C1, B)) |
| 381 | self.assertTrue(issubclass(C1, (B,))) |
| 382 | self.assertTrue(issubclass(C1, B1)) |
| 383 | self.assertTrue(issubclass(C1, (B1,))) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 384 | C1.register(int) |
| 385 | class MyInt(int): |
| 386 | pass |
Benjamin Peterson | c9c0f20 | 2009-06-30 23:06:06 +0000 | [diff] [blame] | 387 | self.assertTrue(issubclass(MyInt, A)) |
| 388 | self.assertTrue(issubclass(MyInt, (A,))) |
Ezio Melotti | e961593 | 2010-01-24 19:26:24 +0000 | [diff] [blame] | 389 | self.assertIsInstance(42, A) |
| 390 | self.assertIsInstance(42, (A,)) |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 391 | |
Guido van Rossum | 894d35e | 2007-09-11 20:42:30 +0000 | [diff] [blame] | 392 | def test_all_new_methods_are_called(self): |
| 393 | class A(metaclass=abc.ABCMeta): |
| 394 | pass |
Christian Heimes | 043d6f6 | 2008-01-07 17:19:16 +0000 | [diff] [blame] | 395 | class B(object): |
Guido van Rossum | 894d35e | 2007-09-11 20:42:30 +0000 | [diff] [blame] | 396 | counter = 0 |
| 397 | def __new__(cls): |
| 398 | B.counter += 1 |
| 399 | return super().__new__(cls) |
| 400 | class C(A, B): |
| 401 | pass |
| 402 | self.assertEqual(B.counter, 0) |
| 403 | C() |
| 404 | self.assertEqual(B.counter, 1) |
| 405 | |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 406 | |
Guido van Rossum | cd16bf6 | 2007-06-13 18:07:49 +0000 | [diff] [blame] | 407 | if __name__ == "__main__": |
| 408 | unittest.main() |