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""" Test cases for the L{twisted.python.reflect} module. """ from __future__ import division, absolute_import import os import weakref from collections import deque from twisted.python.compat import _PY3 from twisted.trial import unittest from twisted.trial.unittest import SynchronousTestCase as TestCase from twisted.python import reflect from twisted.python.reflect import ( accumulateMethods, prefixedMethods, prefixedMethodNames, addMethodNamesToDict, fullyQualifiedName) class Base(object): """ A no-op class which can be used to verify the behavior of method-discovering APIs. """ def method(self): """ A no-op method which can be discovered. """ class Sub(Base): """ A subclass of a class with a method which can be discovered. """ class Separate(object): """ A no-op class with methods with differing prefixes. """ def good_method(self): """ A no-op method which a matching prefix to be discovered. """ def bad_method(self): """ A no-op method with a mismatched prefix to not be discovered. """ class AccumulateMethodsTests(TestCase): """ Tests for L{accumulateMethods} which finds methods on a class hierarchy and adds them to a dictionary. """ def test_ownClass(self): """ If x is and instance of Base and Base defines a method named method, L{accumulateMethods} adds an item to the given dictionary with C{"method"} as the key and a bound method object for Base.method value. """ x = Base() output = {} accumulateMethods(x, output) self.assertEqual({"method": x.method}, output) def test_baseClass(self): """ If x is an instance of Sub and Sub is a subclass of Base and Base defines a method named method, L{accumulateMethods} adds an item to the given dictionary with C{"method"} as the key and a bound method object for Base.method as the value. """ x = Sub() output = {} accumulateMethods(x, output) self.assertEqual({"method": x.method}, output) def test_prefix(self): """ If a prefix is given, L{accumulateMethods} limits its results to methods beginning with that prefix. Keys in the resulting dictionary also have the prefix removed from them. """ x = Separate() output = {} accumulateMethods(x, output, 'good_') self.assertEqual({'method': x.good_method}, output) class PrefixedMethodsTests(TestCase): """ Tests for L{prefixedMethods} which finds methods on a class hierarchy and adds them to a dictionary. """ def test_onlyObject(self): """ L{prefixedMethods} returns a list of the methods discovered on an object. """ x = Base() output = prefixedMethods(x) self.assertEqual([x.method], output) def test_prefix(self): """ If a prefix is given, L{prefixedMethods} returns only methods named with that prefix. """ x = Separate() output = prefixedMethods(x, 'good_') self.assertEqual([x.good_method], output) class PrefixedMethodNamesTests(TestCase): """ Tests for L{prefixedMethodNames}. """ def test_method(self): """ L{prefixedMethodNames} returns a list including methods with the given prefix defined on the class passed to it. """ self.assertEqual(["method"], prefixedMethodNames(Separate, "good_")) def test_inheritedMethod(self): """ L{prefixedMethodNames} returns a list included methods with the given prefix defined on base classes of the class passed to it. """ class Child(Separate): pass self.assertEqual(["method"], prefixedMethodNames(Child, "good_")) class AddMethodNamesToDictTests(TestCase): """ Tests for L{addMethodNamesToDict}. """ def test_baseClass(self): """ If C{baseClass} is passed to L{addMethodNamesToDict}, only methods which are a subclass of C{baseClass} are added to the result dictionary. """ class Alternate(object): pass class Child(Separate, Alternate): def good_alternate(self): pass result = {} addMethodNamesToDict(Child, result, 'good_', Alternate) self.assertEqual({'alternate': 1}, result) class Summer(object): """ A class we look up as part of the LookupsTests. """ def reallySet(self): """ Do something. """ class LookupsTests(TestCase): """ Tests for L{namedClass}, L{namedModule}, and L{namedAny}. """ def test_namedClassLookup(self): """ L{namedClass} should return the class object for the name it is passed. """ self.assertIs( reflect.namedClass("twisted.test.test_reflect.Summer"), Summer) def test_namedModuleLookup(self): """ L{namedModule} should return the module object for the name it is passed. """ from twisted.python import monkey self.assertIs( reflect.namedModule("twisted.python.monkey"), monkey) def test_namedAnyPackageLookup(self): """ L{namedAny} should return the package object for the name it is passed. """ import twisted.python self.assertIs( reflect.namedAny("twisted.python"), twisted.python) def test_namedAnyModuleLookup(self): """ L{namedAny} should return the module object for the name it is passed. """ from twisted.python import monkey self.assertIs( reflect.namedAny("twisted.python.monkey"), monkey) def test_namedAnyClassLookup(self): """ L{namedAny} should return the class object for the name it is passed. """ self.assertIs( reflect.namedAny("twisted.test.test_reflect.Summer"), Summer) def test_namedAnyAttributeLookup(self): """ L{namedAny} should return the object an attribute of a non-module, non-package object is bound to for the name it is passed. """ # Note - not assertIs because unbound method lookup creates a new # object every time. This is a foolishness of Python's object # implementation, not a bug in Twisted. self.assertEqual( reflect.namedAny( "twisted.test.test_reflect.Summer.reallySet"), Summer.reallySet) def test_namedAnySecondAttributeLookup(self): """ L{namedAny} should return the object an attribute of an object which itself was an attribute of a non-module, non-package object is bound to for the name it is passed. """ self.assertIs( reflect.namedAny( "twisted.test.test_reflect." "Summer.reallySet.__doc__"), Summer.reallySet.__doc__) def test_importExceptions(self): """ Exceptions raised by modules which L{namedAny} causes to be imported should pass through L{namedAny} to the caller. """ self.assertRaises( ZeroDivisionError, reflect.namedAny, "twisted.test.reflect_helper_ZDE") # Make sure that there is post-failed-import cleanup self.assertRaises( ZeroDivisionError, reflect.namedAny, "twisted.test.reflect_helper_ZDE") self.assertRaises( ValueError, reflect.namedAny, "twisted.test.reflect_helper_VE") # Modules which themselves raise ImportError when imported should # result in an ImportError self.assertRaises( ImportError, reflect.namedAny, "twisted.test.reflect_helper_IE") def test_attributeExceptions(self): """ If segments on the end of a fully-qualified Python name represents attributes which aren't actually present on the object represented by the earlier segments, L{namedAny} should raise an L{AttributeError}. """ self.assertRaises( AttributeError, reflect.namedAny, "twisted.nosuchmoduleintheworld") # ImportError behaves somewhat differently between "import # extant.nonextant" and "import extant.nonextant.nonextant", so test # the latter as well. self.assertRaises( AttributeError, reflect.namedAny, "twisted.nosuch.modulein.theworld") self.assertRaises( AttributeError, reflect.namedAny, "twisted.test.test_reflect.Summer.nosuchattribute") def test_invalidNames(self): """ Passing a name which isn't a fully-qualified Python name to L{namedAny} should result in one of the following exceptions: - L{InvalidName}: the name is not a dot-separated list of Python objects - L{ObjectNotFound}: the object doesn't exist - L{ModuleNotFound}: the object doesn't exist and there is only one component in the name """ err = self.assertRaises(reflect.ModuleNotFound, reflect.namedAny, 'nosuchmoduleintheworld') self.assertEqual(str(err), "No module named 'nosuchmoduleintheworld'") # This is a dot-separated list, but it isn't valid! err = self.assertRaises(reflect.ObjectNotFound, reflect.namedAny, "@#$@(#.!@(#!@#") self.assertEqual(str(err), "'@#$@(#.!@(#!@#' does not name an object") err = self.assertRaises(reflect.ObjectNotFound, reflect.namedAny, "tcelfer.nohtyp.detsiwt") self.assertEqual( str(err), "'tcelfer.nohtyp.detsiwt' does not name an object") err = self.assertRaises(reflect.InvalidName, reflect.namedAny, '') self.assertEqual(str(err), 'Empty module name') for invalidName in ['.twisted', 'twisted.', 'twisted..python']: err = self.assertRaises( reflect.InvalidName, reflect.namedAny, invalidName) self.assertEqual( str(err), "name must be a string giving a '.'-separated list of Python " "identifiers, not %r" % (invalidName,)) def test_requireModuleImportError(self): """ When module import fails with ImportError it returns the specified default value. """ for name in ['nosuchmtopodule', 'no.such.module']: default = object() result = reflect.requireModule(name, default=default) self.assertIs(result, default) def test_requireModuleDefaultNone(self): """ When module import fails it returns L{None} by default. """ result = reflect.requireModule('no.such.module') self.assertIsNone(result) def test_requireModuleRequestedImport(self): """ When module import succeed it returns the module and not the default value. """ from twisted.python import monkey default = object() self.assertIs( reflect.requireModule('twisted.python.monkey', default=default), monkey, ) class Breakable(object): breakRepr = False breakStr = False def __str__(self): if self.breakStr: raise RuntimeError("str!") else: return '' def __repr__(self): if self.breakRepr: raise RuntimeError("repr!") else: return 'Breakable()' class BrokenType(Breakable, type): breakName = False def get___name__(self): if self.breakName: raise RuntimeError("no name") return 'BrokenType' __name__ = property(get___name__) BTBase = BrokenType('BTBase', (Breakable,), {"breakRepr": True, "breakStr": True}) class NoClassAttr(Breakable): __class__ = property(lambda x: x.not_class) class SafeReprTests(TestCase): """ Tests for L{reflect.safe_repr} function. """ def test_workingRepr(self): """ L{reflect.safe_repr} produces the same output as C{repr} on a working object. """ xs = ([1, 2, 3], b'a') self.assertEqual(list(map(reflect.safe_repr, xs)), list(map(repr, xs))) def test_brokenRepr(self): """ L{reflect.safe_repr} returns a string with class name, address, and traceback when the repr call failed. """ b = Breakable() b.breakRepr = True bRepr = reflect.safe_repr(b) self.assertIn("Breakable instance at 0x", bRepr) # Check that the file is in the repr, but without the extension as it # can be .py/.pyc self.assertIn(os.path.splitext(__file__)[0], bRepr) self.assertIn("RuntimeError: repr!", bRepr) def test_brokenStr(self): """ L{reflect.safe_repr} isn't affected by a broken C{__str__} method. """ b = Breakable() b.breakStr = True self.assertEqual(reflect.safe_repr(b), repr(b)) def test_brokenClassRepr(self): class X(BTBase): breakRepr = True reflect.safe_repr(X) reflect.safe_repr(X()) def test_brokenReprIncludesID(self): """ C{id} is used to print the ID of the object in case of an error. L{safe_repr} includes a traceback after a newline, so we only check against the first line of the repr. """ class X(BTBase): breakRepr = True xRepr = reflect.safe_repr(X) xReprExpected = ('