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| 1 # Copyright (c) 2001-2007 Twisted Matrix Laboratories. | |
| 2 # See LICENSE for details. | |
| 3 | |
| 4 | |
| 5 """ | |
| 6 Test cases for Twisted component architecture. | |
| 7 """ | |
| 8 | |
| 9 from zope.interface import Interface, implements, Attribute | |
| 10 | |
| 11 from twisted.trial import unittest | |
| 12 from twisted.python import components | |
| 13 from twisted.python.components import proxyForInterface | |
| 14 | |
| 15 | |
| 16 class InterfacesTestCase(unittest.TestCase): | |
| 17 """Test interfaces.""" | |
| 18 | |
| 19 class Compo(components.Componentized): | |
| 20 num = 0 | |
| 21 def inc(self): | |
| 22 self.num = self.num + 1 | |
| 23 return self.num | |
| 24 | |
| 25 class IAdept(Interface): | |
| 26 def adaptorFunc(): | |
| 27 raise NotImplementedError() | |
| 28 | |
| 29 class IElapsed(Interface): | |
| 30 def elapsedFunc(): | |
| 31 """ | |
| 32 1! | |
| 33 """ | |
| 34 | |
| 35 class Adept(components.Adapter): | |
| 36 implements(IAdept) | |
| 37 def __init__(self, orig): | |
| 38 self.original = orig | |
| 39 self.num = 0 | |
| 40 def adaptorFunc(self): | |
| 41 self.num = self.num + 1 | |
| 42 return self.num, self.original.inc() | |
| 43 | |
| 44 class Elapsed(components.Adapter): | |
| 45 implements(IElapsed) | |
| 46 def elapsedFunc(self): | |
| 47 return 1 | |
| 48 | |
| 49 components.registerAdapter(Adept, Compo, IAdept) | |
| 50 components.registerAdapter(Elapsed, Compo, IElapsed) | |
| 51 | |
| 52 class AComp(components.Componentized): | |
| 53 pass | |
| 54 class BComp(AComp): | |
| 55 pass | |
| 56 class CComp(BComp): | |
| 57 pass | |
| 58 | |
| 59 class ITest(Interface): | |
| 60 pass | |
| 61 class ITest2(Interface): | |
| 62 pass | |
| 63 class ITest3(Interface): | |
| 64 pass | |
| 65 class ITest4(Interface): | |
| 66 pass | |
| 67 class Test(components.Adapter): | |
| 68 implements(ITest, ITest3, ITest4) | |
| 69 def __init__(self, orig): | |
| 70 pass | |
| 71 class Test2: | |
| 72 implements(ITest2) | |
| 73 temporaryAdapter = 1 | |
| 74 def __init__(self, orig): | |
| 75 pass | |
| 76 | |
| 77 components.registerAdapter(Test, AComp, ITest) | |
| 78 components.registerAdapter(Test, AComp, ITest3) | |
| 79 components.registerAdapter(Test2, AComp, ITest2) | |
| 80 | |
| 81 | |
| 82 | |
| 83 | |
| 84 class ComponentizedTestCase(unittest.TestCase): | |
| 85 """Simple test case for caching in Componentized. | |
| 86 """ | |
| 87 def testComponentized(self): | |
| 88 c = Compo() | |
| 89 assert c.getComponent(IAdept).adaptorFunc() == (1, 1) | |
| 90 assert c.getComponent(IAdept).adaptorFunc() == (2, 2) | |
| 91 assert IElapsed(IAdept(c)).elapsedFunc() == 1 | |
| 92 | |
| 93 def testInheritanceAdaptation(self): | |
| 94 c = CComp() | |
| 95 co1 = c.getComponent(ITest) | |
| 96 co2 = c.getComponent(ITest) | |
| 97 co3 = c.getComponent(ITest2) | |
| 98 co4 = c.getComponent(ITest2) | |
| 99 assert co1 is co2 | |
| 100 assert co3 is not co4 | |
| 101 c.removeComponent(co1) | |
| 102 co5 = c.getComponent(ITest) | |
| 103 co6 = c.getComponent(ITest) | |
| 104 assert co5 is co6 | |
| 105 assert co1 is not co5 | |
| 106 | |
| 107 def testMultiAdapter(self): | |
| 108 c = CComp() | |
| 109 co1 = c.getComponent(ITest) | |
| 110 co2 = c.getComponent(ITest2) | |
| 111 co3 = c.getComponent(ITest3) | |
| 112 co4 = c.getComponent(ITest4) | |
| 113 assert co4 == None | |
| 114 assert co1 is co3 | |
| 115 | |
| 116 | |
| 117 def test_getComponentDefaults(self): | |
| 118 """ | |
| 119 Test that a default value specified to Componentized.getComponent if | |
| 120 there is no component for the requested interface. | |
| 121 """ | |
| 122 componentized = components.Componentized() | |
| 123 default = object() | |
| 124 self.assertIdentical( | |
| 125 componentized.getComponent(ITest, default), | |
| 126 default) | |
| 127 self.assertIdentical( | |
| 128 componentized.getComponent(ITest, default=default), | |
| 129 default) | |
| 130 self.assertIdentical( | |
| 131 componentized.getComponent(ITest), | |
| 132 None) | |
| 133 | |
| 134 | |
| 135 | |
| 136 class AdapterTestCase(unittest.TestCase): | |
| 137 """Test adapters.""" | |
| 138 | |
| 139 def testAdapterGetComponent(self): | |
| 140 o = object() | |
| 141 a = Adept(o) | |
| 142 self.assertRaises(components.CannotAdapt, ITest, a) | |
| 143 self.assertEquals(ITest(a, None), None) | |
| 144 | |
| 145 | |
| 146 | |
| 147 class IMeta(Interface): | |
| 148 pass | |
| 149 | |
| 150 class MetaAdder(components.Adapter): | |
| 151 implements(IMeta) | |
| 152 def add(self, num): | |
| 153 return self.original.num + num | |
| 154 | |
| 155 class BackwardsAdder(components.Adapter): | |
| 156 implements(IMeta) | |
| 157 def add(self, num): | |
| 158 return self.original.num - num | |
| 159 | |
| 160 class MetaNumber: | |
| 161 def __init__(self, num): | |
| 162 self.num = num | |
| 163 | |
| 164 class FakeAdder: | |
| 165 def add(self, num): | |
| 166 return num + 5 | |
| 167 | |
| 168 class FakeNumber: | |
| 169 num = 3 | |
| 170 | |
| 171 class ComponentNumber(components.Componentized): | |
| 172 def __init__(self): | |
| 173 self.num = 0 | |
| 174 components.Componentized.__init__(self) | |
| 175 | |
| 176 class ComponentMeta(components.Adapter): | |
| 177 implements(IMeta) | |
| 178 def __init__(self, original): | |
| 179 components.Adapter.__init__(self, original) | |
| 180 self.num = self.original.num | |
| 181 | |
| 182 class ComponentAdder(ComponentMeta): | |
| 183 def add(self, num): | |
| 184 self.num += num | |
| 185 return self.num | |
| 186 | |
| 187 class ComponentDoubler(ComponentMeta): | |
| 188 def add(self, num): | |
| 189 self.num += (num * 2) | |
| 190 return self.original.num | |
| 191 | |
| 192 components.registerAdapter(MetaAdder, MetaNumber, IMeta) | |
| 193 components.registerAdapter(ComponentAdder, ComponentNumber, IMeta) | |
| 194 | |
| 195 class IAttrX(Interface): | |
| 196 def x(): | |
| 197 pass | |
| 198 | |
| 199 class IAttrXX(Interface): | |
| 200 def xx(): | |
| 201 pass | |
| 202 | |
| 203 class Xcellent: | |
| 204 implements(IAttrX) | |
| 205 def x(self): | |
| 206 return 'x!' | |
| 207 | |
| 208 class DoubleXAdapter: | |
| 209 num = 42 | |
| 210 def __init__(self, original): | |
| 211 self.original = original | |
| 212 def xx(self): | |
| 213 return (self.original.x(), self.original.x()) | |
| 214 def __cmp__(self, other): | |
| 215 return cmp(self.num, other.num) | |
| 216 | |
| 217 components.registerAdapter(DoubleXAdapter, IAttrX, IAttrXX) | |
| 218 | |
| 219 class TestMetaInterface(unittest.TestCase): | |
| 220 | |
| 221 def testBasic(self): | |
| 222 n = MetaNumber(1) | |
| 223 self.assertEquals(IMeta(n).add(1), 2) | |
| 224 | |
| 225 def testComponentizedInteraction(self): | |
| 226 c = ComponentNumber() | |
| 227 IMeta(c).add(1) | |
| 228 IMeta(c).add(1) | |
| 229 self.assertEquals(IMeta(c).add(1), 3) | |
| 230 | |
| 231 def testAdapterWithCmp(self): | |
| 232 # Make sure that a __cmp__ on an adapter doesn't break anything | |
| 233 xx = IAttrXX(Xcellent()) | |
| 234 self.assertEqual(('x!', 'x!'), xx.xx()) | |
| 235 | |
| 236 | |
| 237 class RegistrationTestCase(unittest.TestCase): | |
| 238 """ | |
| 239 Tests for adapter registration. | |
| 240 """ | |
| 241 def _registerAdapterForClassOrInterface(self, original): | |
| 242 adapter = lambda o: None | |
| 243 class TheInterface(Interface): | |
| 244 pass | |
| 245 components.registerAdapter(adapter, original, TheInterface) | |
| 246 self.assertIdentical( | |
| 247 components.getAdapterFactory(original, TheInterface, None), | |
| 248 adapter) | |
| 249 | |
| 250 | |
| 251 def test_registerAdapterForClass(self): | |
| 252 """ | |
| 253 Test that an adapter from a class can be registered and then looked | |
| 254 up. | |
| 255 """ | |
| 256 class TheOriginal(object): | |
| 257 pass | |
| 258 return self._registerAdapterForClassOrInterface(TheOriginal) | |
| 259 | |
| 260 | |
| 261 def test_registerAdapterForInterface(self): | |
| 262 """ | |
| 263 Test that an adapter from an interface can be registered and then | |
| 264 looked up. | |
| 265 """ | |
| 266 class TheOriginal(Interface): | |
| 267 pass | |
| 268 return self._registerAdapterForClassOrInterface(TheOriginal) | |
| 269 | |
| 270 | |
| 271 def _duplicateAdapterForClassOrInterface(self, original): | |
| 272 firstAdapter = lambda o: False | |
| 273 secondAdapter = lambda o: True | |
| 274 class TheInterface(Interface): | |
| 275 pass | |
| 276 components.registerAdapter(firstAdapter, original, TheInterface) | |
| 277 self.assertRaises( | |
| 278 ValueError, | |
| 279 components.registerAdapter, | |
| 280 secondAdapter, original, TheInterface) | |
| 281 # Make sure that the original adapter is still around as well | |
| 282 self.assertIdentical( | |
| 283 components.getAdapterFactory(original, TheInterface, None), | |
| 284 firstAdapter) | |
| 285 | |
| 286 | |
| 287 def test_duplicateAdapterForClass(self): | |
| 288 """ | |
| 289 Test that attempting to register a second adapter from a class | |
| 290 raises the appropriate exception. | |
| 291 """ | |
| 292 class TheOriginal(object): | |
| 293 pass | |
| 294 return self._duplicateAdapterForClassOrInterface(TheOriginal) | |
| 295 | |
| 296 | |
| 297 def test_duplicateAdapterForInterface(self): | |
| 298 """ | |
| 299 Test that attempting to register a second adapter from an interface | |
| 300 raises the appropriate exception. | |
| 301 """ | |
| 302 class TheOriginal(Interface): | |
| 303 pass | |
| 304 return self._duplicateAdapterForClassOrInterface(TheOriginal) | |
| 305 | |
| 306 | |
| 307 def _duplicateAdapterForClassOrInterfaceAllowed(self, original): | |
| 308 firstAdapter = lambda o: False | |
| 309 secondAdapter = lambda o: True | |
| 310 class TheInterface(Interface): | |
| 311 pass | |
| 312 components.registerAdapter(firstAdapter, original, TheInterface) | |
| 313 components.ALLOW_DUPLICATES = True | |
| 314 try: | |
| 315 components.registerAdapter(secondAdapter, original, TheInterface) | |
| 316 self.assertIdentical( | |
| 317 components.getAdapterFactory(original, TheInterface, None), | |
| 318 secondAdapter) | |
| 319 finally: | |
| 320 components.ALLOW_DUPLICATES = False | |
| 321 | |
| 322 # It should be rejected again at this point | |
| 323 self.assertRaises( | |
| 324 ValueError, | |
| 325 components.registerAdapter, | |
| 326 firstAdapter, original, TheInterface) | |
| 327 | |
| 328 self.assertIdentical( | |
| 329 components.getAdapterFactory(original, TheInterface, None), | |
| 330 secondAdapter) | |
| 331 | |
| 332 def test_duplicateAdapterForClassAllowed(self): | |
| 333 """ | |
| 334 Test that when L{components.ALLOW_DUPLICATES} is set to a true | |
| 335 value, duplicate registrations from classes are allowed to override | |
| 336 the original registration. | |
| 337 """ | |
| 338 class TheOriginal(object): | |
| 339 pass | |
| 340 return self._duplicateAdapterForClassOrInterfaceAllowed(TheOriginal) | |
| 341 | |
| 342 | |
| 343 def test_duplicateAdapterForInterfaceAllowed(self): | |
| 344 """ | |
| 345 Test that when L{components.ALLOW_DUPLICATES} is set to a true | |
| 346 value, duplicate registrations from interfaces are allowed to | |
| 347 override the original registration. | |
| 348 """ | |
| 349 class TheOriginal(Interface): | |
| 350 pass | |
| 351 return self._duplicateAdapterForClassOrInterfaceAllowed(TheOriginal) | |
| 352 | |
| 353 | |
| 354 def _multipleInterfacesForClassOrInterface(self, original): | |
| 355 adapter = lambda o: None | |
| 356 class FirstInterface(Interface): | |
| 357 pass | |
| 358 class SecondInterface(Interface): | |
| 359 pass | |
| 360 components.registerAdapter(adapter, original, FirstInterface, SecondInte
rface) | |
| 361 self.assertIdentical( | |
| 362 components.getAdapterFactory(original, FirstInterface, None), | |
| 363 adapter) | |
| 364 self.assertIdentical( | |
| 365 components.getAdapterFactory(original, SecondInterface, None), | |
| 366 adapter) | |
| 367 | |
| 368 | |
| 369 def test_multipleInterfacesForClass(self): | |
| 370 """ | |
| 371 Test the registration of an adapter from a class to several | |
| 372 interfaces at once. | |
| 373 """ | |
| 374 class TheOriginal(object): | |
| 375 pass | |
| 376 return self._multipleInterfacesForClassOrInterface(TheOriginal) | |
| 377 | |
| 378 | |
| 379 def test_multipleInterfacesForInterface(self): | |
| 380 """ | |
| 381 Test the registration of an adapter from an interface to several | |
| 382 interfaces at once. | |
| 383 """ | |
| 384 class TheOriginal(Interface): | |
| 385 pass | |
| 386 return self._multipleInterfacesForClassOrInterface(TheOriginal) | |
| 387 | |
| 388 | |
| 389 def _subclassAdapterRegistrationForClassOrInterface(self, original): | |
| 390 firstAdapter = lambda o: True | |
| 391 secondAdapter = lambda o: False | |
| 392 class TheSubclass(original): | |
| 393 pass | |
| 394 class TheInterface(Interface): | |
| 395 pass | |
| 396 components.registerAdapter(firstAdapter, original, TheInterface) | |
| 397 components.registerAdapter(secondAdapter, TheSubclass, TheInterface) | |
| 398 self.assertIdentical( | |
| 399 components.getAdapterFactory(original, TheInterface, None), | |
| 400 firstAdapter) | |
| 401 self.assertIdentical( | |
| 402 components.getAdapterFactory(TheSubclass, TheInterface, None), | |
| 403 secondAdapter) | |
| 404 | |
| 405 | |
| 406 def test_subclassAdapterRegistrationForClass(self): | |
| 407 """ | |
| 408 Test that an adapter to a particular interface can be registered | |
| 409 from both a class and its subclass. | |
| 410 """ | |
| 411 class TheOriginal(object): | |
| 412 pass | |
| 413 return self._subclassAdapterRegistrationForClassOrInterface(TheOriginal) | |
| 414 | |
| 415 | |
| 416 def test_subclassAdapterRegistrationForInterface(self): | |
| 417 """ | |
| 418 Test that an adapter to a particular interface can be registered | |
| 419 from both an interface and its subclass. | |
| 420 """ | |
| 421 class TheOriginal(Interface): | |
| 422 pass | |
| 423 return self._subclassAdapterRegistrationForClassOrInterface(TheOriginal) | |
| 424 | |
| 425 | |
| 426 | |
| 427 class IProxiedInterface(Interface): | |
| 428 """ | |
| 429 An interface class for use by L{proxyForInterface}. | |
| 430 """ | |
| 431 | |
| 432 ifaceAttribute = Attribute(""" | |
| 433 An example declared attribute, which should be proxied.""") | |
| 434 | |
| 435 def yay(*a, **kw): | |
| 436 """ | |
| 437 A sample method which should be proxied. | |
| 438 """ | |
| 439 | |
| 440 class IProxiedSubInterface(IProxiedInterface): | |
| 441 """ | |
| 442 An interface that derives from another for use with L{proxyForInterface}. | |
| 443 """ | |
| 444 | |
| 445 def boo(self): | |
| 446 """ | |
| 447 A different sample method which should be proxied. | |
| 448 """ | |
| 449 | |
| 450 | |
| 451 | |
| 452 class Yayable(object): | |
| 453 """ | |
| 454 A provider of L{IProxiedInterface} which increments a counter for | |
| 455 every call to C{yay}. | |
| 456 | |
| 457 @ivar yays: The number of times C{yay} has been called. | |
| 458 """ | |
| 459 implements(IProxiedInterface) | |
| 460 | |
| 461 def __init__(self): | |
| 462 self.yays = 0 | |
| 463 self.yayArgs = [] | |
| 464 | |
| 465 def yay(self, *a, **kw): | |
| 466 """ | |
| 467 Increment C{self.yays}. | |
| 468 """ | |
| 469 self.yays += 1 | |
| 470 self.yayArgs.append((a, kw)) | |
| 471 return self.yays | |
| 472 | |
| 473 | |
| 474 class Booable(object): | |
| 475 """ | |
| 476 An implementation of IProxiedSubInterface | |
| 477 """ | |
| 478 implements(IProxiedSubInterface) | |
| 479 yayed = False | |
| 480 booed = False | |
| 481 def yay(self): | |
| 482 """ | |
| 483 Mark the fact that 'yay' has been called. | |
| 484 """ | |
| 485 self.yayed = True | |
| 486 | |
| 487 | |
| 488 def boo(self): | |
| 489 """ | |
| 490 Mark the fact that 'boo' has been called.1 | |
| 491 """ | |
| 492 self.booed = True | |
| 493 | |
| 494 | |
| 495 | |
| 496 class IMultipleMethods(Interface): | |
| 497 """ | |
| 498 An interface with multiple methods. | |
| 499 """ | |
| 500 | |
| 501 def methodOne(): | |
| 502 """ | |
| 503 The first method. Should return 1. | |
| 504 """ | |
| 505 | |
| 506 def methodTwo(): | |
| 507 """ | |
| 508 The second method. Should return 2. | |
| 509 """ | |
| 510 | |
| 511 | |
| 512 | |
| 513 class MultipleMethodImplementor(object): | |
| 514 """ | |
| 515 A precise implementation of L{IMultipleMethods}. | |
| 516 """ | |
| 517 | |
| 518 def methodOne(self): | |
| 519 """ | |
| 520 @return: 1 | |
| 521 """ | |
| 522 return 1 | |
| 523 | |
| 524 | |
| 525 def methodTwo(self): | |
| 526 """ | |
| 527 @return: 2 | |
| 528 """ | |
| 529 return 2 | |
| 530 | |
| 531 | |
| 532 | |
| 533 class ProxyForInterfaceTests(unittest.TestCase): | |
| 534 """ | |
| 535 Tests for L{proxyForInterface}. | |
| 536 """ | |
| 537 | |
| 538 def test_original(self): | |
| 539 """ | |
| 540 Proxy objects should have an C{original} attribute which refers to the | |
| 541 original object passed to the constructor. | |
| 542 """ | |
| 543 original = object() | |
| 544 proxy = proxyForInterface(IProxiedInterface)(original) | |
| 545 self.assertIdentical(proxy.original, original) | |
| 546 | |
| 547 | |
| 548 def test_proxyMethod(self): | |
| 549 """ | |
| 550 The class created from L{proxyForInterface} passes methods on an | |
| 551 interface to the object which is passed to its constructor. | |
| 552 """ | |
| 553 klass = proxyForInterface(IProxiedInterface) | |
| 554 yayable = Yayable() | |
| 555 proxy = klass(yayable) | |
| 556 proxy.yay() | |
| 557 self.assertEquals(proxy.yay(), 2) | |
| 558 self.assertEquals(yayable.yays, 2) | |
| 559 | |
| 560 | |
| 561 def test_proxyAttribute(self): | |
| 562 """ | |
| 563 Proxy objects should proxy declared attributes, but not other | |
| 564 attributes. | |
| 565 """ | |
| 566 yayable = Yayable() | |
| 567 yayable.ifaceAttribute = object() | |
| 568 proxy = proxyForInterface(IProxiedInterface)(yayable) | |
| 569 self.assertIdentical(proxy.ifaceAttribute, yayable.ifaceAttribute) | |
| 570 self.assertRaises(AttributeError, lambda: proxy.yays) | |
| 571 | |
| 572 | |
| 573 def test_proxySetAttribute(self): | |
| 574 """ | |
| 575 The attributes that proxy objects proxy should be assignable and affect | |
| 576 the original object. | |
| 577 """ | |
| 578 yayable = Yayable() | |
| 579 proxy = proxyForInterface(IProxiedInterface)(yayable) | |
| 580 thingy = object() | |
| 581 proxy.ifaceAttribute = thingy | |
| 582 self.assertIdentical(yayable.ifaceAttribute, thingy) | |
| 583 | |
| 584 | |
| 585 def test_proxyDeleteAttribute(self): | |
| 586 """ | |
| 587 The attributes that proxy objects proxy should be deletable and affect | |
| 588 the original object. | |
| 589 """ | |
| 590 yayable = Yayable() | |
| 591 yayable.ifaceAttribute = None | |
| 592 proxy = proxyForInterface(IProxiedInterface)(yayable) | |
| 593 del proxy.ifaceAttribute | |
| 594 self.assertFalse(hasattr(yayable, 'ifaceAttribute')) | |
| 595 | |
| 596 | |
| 597 def test_multipleMethods(self): | |
| 598 """ | |
| 599 [Regression test] The proxy should send its method calls to the correct | |
| 600 method, not the incorrect one. | |
| 601 """ | |
| 602 multi = MultipleMethodImplementor() | |
| 603 proxy = proxyForInterface(IMultipleMethods)(multi) | |
| 604 self.assertEquals(proxy.methodOne(), 1) | |
| 605 self.assertEquals(proxy.methodTwo(), 2) | |
| 606 | |
| 607 | |
| 608 def test_subclassing(self): | |
| 609 """ | |
| 610 It is possible to subclass the result of L{proxyForInterface}. | |
| 611 """ | |
| 612 | |
| 613 class SpecializedProxy(proxyForInterface(IProxiedInterface)): | |
| 614 """ | |
| 615 A specialized proxy which can decrement the number of yays. | |
| 616 """ | |
| 617 def boo(self): | |
| 618 """ | |
| 619 Decrement the number of yays. | |
| 620 """ | |
| 621 self.original.yays -= 1 | |
| 622 | |
| 623 yayable = Yayable() | |
| 624 special = SpecializedProxy(yayable) | |
| 625 self.assertEquals(yayable.yays, 0) | |
| 626 special.boo() | |
| 627 self.assertEquals(yayable.yays, -1) | |
| 628 | |
| 629 | |
| 630 def test_proxyName(self): | |
| 631 """ | |
| 632 The name of a proxy class indicates which interface it proxies. | |
| 633 """ | |
| 634 proxy = proxyForInterface(IProxiedInterface) | |
| 635 self.assertEquals( | |
| 636 proxy.__name__, | |
| 637 "(Proxy for " | |
| 638 "twisted.python.test.test_components.IProxiedInterface)") | |
| 639 | |
| 640 | |
| 641 def test_provides(self): | |
| 642 """ | |
| 643 The resulting proxy provides the Interface that it proxies. | |
| 644 """ | |
| 645 proxy = proxyForInterface(IProxiedInterface) | |
| 646 self.assertTrue(IProxiedInterface.providedBy(proxy)) | |
| 647 | |
| 648 | |
| 649 def test_proxyDescriptorGet(self): | |
| 650 """ | |
| 651 _ProxyDescriptor's __get__ method should return the appropriate | |
| 652 attribute of its argument's 'original' attribute if it is invoked with | |
| 653 an object. If it is invoked with None, it should return a false | |
| 654 class-method emulator instead. | |
| 655 | |
| 656 For some reason, Python's documentation recommends to define | |
| 657 descriptors' __get__ methods with the 'type' parameter as optional, | |
| 658 despite the fact that Python itself never actually calls the descriptor | |
| 659 that way. This is probably do to support 'foo.__get__(bar)' as an | |
| 660 idiom. Let's make sure that the behavior is correct. Since we don't | |
| 661 actually use the 'type' argument at all, this test calls it the | |
| 662 idiomatic way to ensure that signature works; test_proxyInheritance | |
| 663 verifies the how-Python-actually-calls-it signature. | |
| 664 """ | |
| 665 class Sample: | |
| 666 called = False | |
| 667 def hello(self): | |
| 668 self.called = True | |
| 669 fakeProxy = Sample() | |
| 670 testObject = Sample() | |
| 671 fakeProxy.original = testObject | |
| 672 pd = components._ProxyDescriptor("hello", "original") | |
| 673 self.assertEquals(pd.__get__(fakeProxy), testObject.hello) | |
| 674 fakeClassMethod = pd.__get__(None) | |
| 675 fakeClassMethod(fakeProxy) | |
| 676 self.failUnless(testObject.called) | |
| 677 | |
| 678 | |
| 679 def test_proxyInheritance(self): | |
| 680 """ | |
| 681 Subclasses of the class returned from L{proxyForInterface} should be | |
| 682 able to upcall methods by reference to their superclass, as any normal | |
| 683 Python class can. | |
| 684 """ | |
| 685 class YayableWrapper(proxyForInterface(IProxiedInterface)): | |
| 686 """ | |
| 687 This class does not override any functionality. | |
| 688 """ | |
| 689 | |
| 690 class EnhancedWrapper(YayableWrapper): | |
| 691 """ | |
| 692 This class overrides the 'yay' method. | |
| 693 """ | |
| 694 wrappedYays = 1 | |
| 695 def yay(self, *a, **k): | |
| 696 self.wrappedYays += 1 | |
| 697 return YayableWrapper.yay(self, *a, **k) + 7 | |
| 698 | |
| 699 yayable = Yayable() | |
| 700 wrapper = EnhancedWrapper(yayable) | |
| 701 self.assertEquals(wrapper.yay(3, 4, x=5, y=6), 8) | |
| 702 self.assertEquals(yayable.yayArgs, | |
| 703 [((3, 4), dict(x=5, y=6))]) | |
| 704 | |
| 705 | |
| 706 def test_interfaceInheritance(self): | |
| 707 """ | |
| 708 Proxies of subinterfaces generated with proxyForInterface should allow | |
| 709 access to attributes of both the child and the base interfaces. | |
| 710 """ | |
| 711 proxyClass = proxyForInterface(IProxiedSubInterface) | |
| 712 booable = Booable() | |
| 713 proxy = proxyClass(booable) | |
| 714 proxy.yay() | |
| 715 proxy.boo() | |
| 716 self.failUnless(booable.yayed) | |
| 717 self.failUnless(booable.booed) | |
| 718 | |
| 719 | |
| 720 def test_attributeCustomization(self): | |
| 721 """ | |
| 722 The original attribute name can be customized via the | |
| 723 C{originalAttribute} argument of L{proxyForInterface}: the attribute | |
| 724 should change, but the methods of the original object should still be | |
| 725 callable, and the attributes still accessible. | |
| 726 """ | |
| 727 yayable = Yayable() | |
| 728 yayable.ifaceAttribute = object() | |
| 729 proxy = proxyForInterface( | |
| 730 IProxiedInterface, originalAttribute='foo')(yayable) | |
| 731 self.assertIdentical(proxy.foo, yayable) | |
| 732 | |
| 733 # Check the behavior | |
| 734 self.assertEquals(proxy.yay(), 1) | |
| 735 self.assertIdentical(proxy.ifaceAttribute, yayable.ifaceAttribute) | |
| 736 thingy = object() | |
| 737 proxy.ifaceAttribute = thingy | |
| 738 self.assertIdentical(yayable.ifaceAttribute, thingy) | |
| 739 del proxy.ifaceAttribute | |
| 740 self.assertFalse(hasattr(yayable, 'ifaceAttribute')) | |
| 741 | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 12261012:
Remove third_party/twisted_8_1 (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/tools/build