Merged revisions 78227,78229,78288,78348,78377,78770,78774-78776,78810 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r78227 | michael.foord | 2010-02-18 14:30:09 -0600 (Thu, 18 Feb 2010) | 1 line

  unittest.TestCase uses safe_repr for producing failure messages. Partial fix for issue 7956
........
  r78229 | michael.foord | 2010-02-18 15:37:07 -0600 (Thu, 18 Feb 2010) | 1 line

  Fix unittest.TestCase.assertDictContainsSubset so it can't die with unicode issues when constructing failure messages. Issue 7956
........
  r78288 | michael.foord | 2010-02-21 08:48:59 -0600 (Sun, 21 Feb 2010) | 1 line

  Silence UnicodeWarning in crazy unittest test.
........
  r78348 | michael.foord | 2010-02-22 17:28:32 -0600 (Mon, 22 Feb 2010) | 1 line

  Support for old TestResult object (unittest) with warnings when using unsupported features.
........
  r78377 | michael.foord | 2010-02-23 11:00:53 -0600 (Tue, 23 Feb 2010) | 1 line

  unittest.TestResult can now be used with the TextTestRunner. TextTestRunner compatible with old TestResult objects.
........
  r78770 | michael.foord | 2010-03-07 14:22:12 -0600 (Sun, 07 Mar 2010) | 1 line

  Fix for potentials errors in constructing unittest failure messages. Plus skipped test methods no longer run setUp and tearDown (Issue 8059)
........
  r78774 | michael.foord | 2010-03-07 16:04:55 -0600 (Sun, 07 Mar 2010) | 1 line

  Addition of setUpClass and setUpModule shared fixtures to unittest.
........
  r78775 | michael.foord | 2010-03-07 17:10:36 -0600 (Sun, 07 Mar 2010) | 1 line

  Fix accidental name rebinding in unittest py3k warning filtering.
........
  r78776 | michael.foord | 2010-03-07 17:16:20 -0600 (Sun, 07 Mar 2010) | 1 line

  Remove accidental print statement from last commit.
........
  r78810 | raymond.hettinger | 2010-03-09 02:44:18 -0600 (Tue, 09 Mar 2010) | 5 lines

  Improve the basic example.
  * Show both the decorator and regular form for assertRaises()
  * Use assertTrue() instead of assertIn() to teach useful minimal subset of the API
........

8 files changed, 865 insertions, 94 deletions

diff --git a/Doc/library/unittest.rst b/Doc/library/unittest.rst
index e2272f7..4671f8a 100644
--- a/Doc/library/unittest.rst
+++ b/Doc/library/unittest.rst
@@ -177,14 +177,18 @@ Here is a short script to test three functions from the :mod:`random` module::
            self.seq.sort()
            self.assertEqual(self.seq, list(range(10)))
 
+           # should raise an exception for an immutable sequence
+           self.assertRaises(TypeError, random.shuffle, (1,2,3))
+
        def test_choice(self):
            element = random.choice(self.seq)
-           self.assertIn(element, self.seq)
+           self.assertTrue(element in self.seq)
 
        def test_sample(self):
-           self.assertRaises(ValueError, random.sample, self.seq, 20)
+           with self.assertRaises(ValueError):
+               random.sample(self.seq, 20)
            for element in random.sample(self.seq, 5):
-               self.assertIn(element, self.seq)
+               self.assertTrue(element in self.seq)
 
    if __name__ == '__main__':
        unittest.main()
diff --git a/Lib/test/test_unittest.py b/Lib/test/test_unittest.py
index 75b9d0c..453c48d 100644
--- a/Lib/test/test_unittest.py
+++ b/Lib/test/test_unittest.py
@@ -18,10 +18,15 @@ import types
 from copy import deepcopy
 import io
 import pickle
+import warnings
+
 
 ### Support code
 ################################################################
 
+def resultFactory(*_):
+    return unittest.TestResult()
+
 class LoggingResult(unittest.TestResult):
     def __init__(self, log):
         self._events = log
@@ -2076,6 +2081,70 @@ class Test_TestResult(TestCase):
                 'Tests getDescription() for a method with a longer '
                 'docstring.'))
 
+classDict = dict(unittest.TestResult.__dict__)
+for m in ('addSkip', 'addExpectedFailure', 'addUnexpectedSuccess',
+           '__init__'):
+    del classDict[m]
+
+def __init__(self, stream=None, descriptions=None, verbosity=None):
+    self.failures = []
+    self.errors = []
+    self.testsRun = 0
+    self.shouldStop = False
+classDict['__init__'] = __init__
+OldResult = type('OldResult', (object,), classDict)
+
+class Test_OldTestResult(unittest.TestCase):
+
+    def assertOldResultWarning(self, test, failures):
+        with warnings.catch_warnings(record=True) as log:
+            result = OldResult()
+            test.run(result)
+            self.assertEqual(len(result.failures), failures)
+            warning, = log
+            self.assertIs(warning.category, RuntimeWarning)
+
+    def testOldTestResult(self):
+        class Test(unittest.TestCase):
+            def testSkip(self):
+                self.skipTest('foobar')
+            @unittest.expectedFailure
+            def testExpectedFail(self):
+                raise TypeError
+            @unittest.expectedFailure
+            def testUnexpectedSuccess(self):
+                pass
+
+        for test_name, should_pass in (('testSkip', True),
+                                       ('testExpectedFail', True),
+                                       ('testUnexpectedSuccess', False)):
+            test = Test(test_name)
+            self.assertOldResultWarning(test, int(not should_pass))
+
+    def testOldTestTesultSetup(self):
+        class Test(unittest.TestCase):
+            def setUp(self):
+                self.skipTest('no reason')
+            def testFoo(self):
+                pass
+        self.assertOldResultWarning(Test('testFoo'), 0)
+
+    def testOldTestResultClass(self):
+        @unittest.skip('no reason')
+        class Test(unittest.TestCase):
+            def testFoo(self):
+                pass
+        self.assertOldResultWarning(Test('testFoo'), 0)
+
+    def testOldResultWithRunner(self):
+        class Test(unittest.TestCase):
+            def testFoo(self):
+                pass
+        runner = unittest.TextTestRunner(resultclass=OldResult,
+                                          stream=io.StringIO())
+        # This will raise an exception if TextTestRunner can't handle old
+        # test result objects
+        runner.run(Test('testFoo'))
 
 ### Support code for Test_TestCase
 ################################################################
@@ -2578,21 +2647,27 @@ class Test_TestCase(TestCase, TestEquality, TestHashing):
         self.assertDictContainsSubset({'a': 1}, {'a': 1, 'b': 2})
         self.assertDictContainsSubset({'a': 1, 'b': 2}, {'a': 1, 'b': 2})
 
-        self.assertRaises(unittest.TestCase.failureException,
-                          self.assertDictContainsSubset, {'a': 2}, {'a': 1},
-                          '.*Mismatched values:.*')
+        with self.assertRaises(self.failureException):
+            self.assertDictContainsSubset({1: "one"}, {})
 
-        self.assertRaises(unittest.TestCase.failureException,
-                          self.assertDictContainsSubset, {'c': 1}, {'a': 1},
-                          '.*Missing:.*')
+        with self.assertRaises(self.failureException):
+            self.assertDictContainsSubset({'a': 2}, {'a': 1})
 
-        self.assertRaises(unittest.TestCase.failureException,
-                          self.assertDictContainsSubset, {'a': 1, 'c': 1},
-                          {'a': 1}, '.*Missing:.*')
+        with self.assertRaises(self.failureException):
+            self.assertDictContainsSubset({'c': 1}, {'a': 1})
 
-        self.assertRaises(unittest.TestCase.failureException,
-                          self.assertDictContainsSubset, {'a': 1, 'c': 1},
-                          {'a': 1}, '.*Missing:.*Mismatched values:.*')
+        with self.assertRaises(self.failureException):
+            self.assertDictContainsSubset({'a': 1, 'c': 1}, {'a': 1})
+
+        with self.assertRaises(self.failureException):
+            self.assertDictContainsSubset({'a': 1, 'c': 1}, {'a': 1})
+
+        with warnings.catch_warnings(record=True):
+            # silence the UnicodeWarning
+            one = ''.join(chr(i) for i in range(255))
+            # this used to cause a UnicodeDecodeError constructing the failure msg
+            with self.assertRaises(self.failureException):
+                self.assertDictContainsSubset({'foo': one}, {'foo': '\uFFFD'})
 
     def testAssertEqual(self):
         equal_pairs = [
@@ -3028,6 +3103,43 @@ class Test_TestSkipping(TestCase):
         self.assertEqual(result.unexpectedSuccesses, [test])
         self.assertTrue(result.wasSuccessful())
 
+    def test_skip_doesnt_run_setup(self):
+        class Foo(unittest.TestCase):
+            wasSetUp = False
+            wasTornDown = False
+            def setUp(self):
+                Foo.wasSetUp = True
+            def tornDown(self):
+                Foo.wasTornDown = True
+            @unittest.skip('testing')
+            def test_1(self):
+                pass
+
+        result = unittest.TestResult()
+        test = Foo("test_1")
+        suite = unittest.TestSuite([test])
+        suite.run(result)
+        self.assertEqual(result.skipped, [(test, "testing")])
+        self.assertFalse(Foo.wasSetUp)
+        self.assertFalse(Foo.wasTornDown)
+
+    def test_decorated_skip(self):
+        def decorator(func):
+            def inner(*a):
+                return func(*a)
+            return inner
+
+        class Foo(unittest.TestCase):
+            @decorator
+            @unittest.skip('testing')
+            def test_1(self):
+                pass
+
+        result = unittest.TestResult()
+        test = Foo("test_1")
+        suite = unittest.TestSuite([test])
+        suite.run(result)
+        self.assertEqual(result.skipped, [(test, "testing")])
 
 
 class Test_Assertions(TestCase):
@@ -3131,6 +3243,16 @@ class TestLongMessage(TestCase):
         self.assertEquals(self.testableTrue._formatMessage(None, "foo"), "foo")
         self.assertEquals(self.testableTrue._formatMessage("foo", "bar"), "bar : foo")
 
+        # This blows up if _formatMessage uses string concatenation
+        self.testableTrue._formatMessage(object(), 'foo')
+
+    def test_formatMessage_unicode_error(self):
+        with warnings.catch_warnings(record=True):
+            # This causes a UnicodeWarning due to its craziness
+            one = ''.join(chr(i) for i in range(255))
+            # this used to cause a UnicodeDecodeError constructing msg
+            self.testableTrue._formatMessage(one, '\uFFFD')
+
     def assertMessages(self, methodName, args, errors):
         def getMethod(i):
             useTestableFalse  = i < 2
@@ -3795,6 +3917,397 @@ class TestDiscovery(TestCase):
         self.assertEqual(program.verbosity, 2)
 
 
+class TestSetups(unittest.TestCase):
+
+    def getRunner(self):
+        return unittest.TextTestRunner(resultclass=resultFactory,
+                                          stream=io.StringIO())
+    def runTests(self, *cases):
+        suite = unittest.TestSuite()
+        for case in cases:
+            tests = unittest.defaultTestLoader.loadTestsFromTestCase(case)
+            suite.addTests(tests)
+
+        runner = self.getRunner()
+
+        # creating a nested suite exposes some potential bugs
+        realSuite = unittest.TestSuite()
+        realSuite.addTest(suite)
+        # adding empty suites to the end exposes potential bugs
+        suite.addTest(unittest.TestSuite())
+        realSuite.addTest(unittest.TestSuite())
+        return runner.run(realSuite)
+
+    def test_setup_class(self):
+        class Test(unittest.TestCase):
+            setUpCalled = 0
+            @classmethod
+            def setUpClass(cls):
+                Test.setUpCalled += 1
+                unittest.TestCase.setUpClass()
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        result = self.runTests(Test)
+
+        self.assertEqual(Test.setUpCalled, 1)
+        self.assertEqual(result.testsRun, 2)
+        self.assertEqual(len(result.errors), 0)
+
+    def test_teardown_class(self):
+        class Test(unittest.TestCase):
+            tearDownCalled = 0
+            @classmethod
+            def tearDownClass(cls):
+                Test.tearDownCalled += 1
+                unittest.TestCase.tearDownClass()
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        result = self.runTests(Test)
+
+        self.assertEqual(Test.tearDownCalled, 1)
+        self.assertEqual(result.testsRun, 2)
+        self.assertEqual(len(result.errors), 0)
+
+    def test_teardown_class_two_classes(self):
+        class Test(unittest.TestCase):
+            tearDownCalled = 0
+            @classmethod
+            def tearDownClass(cls):
+                Test.tearDownCalled += 1
+                unittest.TestCase.tearDownClass()
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        class Test2(unittest.TestCase):
+            tearDownCalled = 0
+            @classmethod
+            def tearDownClass(cls):
+                Test2.tearDownCalled += 1
+                unittest.TestCase.tearDownClass()
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        result = self.runTests(Test, Test2)
+
+        self.assertEqual(Test.tearDownCalled, 1)
+        self.assertEqual(Test2.tearDownCalled, 1)
+        self.assertEqual(result.testsRun, 4)
+        self.assertEqual(len(result.errors), 0)
+
+    def test_error_in_setupclass(self):
+        class BrokenTest(unittest.TestCase):
+            @classmethod
+            def setUpClass(cls):
+                raise TypeError('foo')
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        result = self.runTests(BrokenTest)
+
+        self.assertEqual(result.testsRun, 0)
+        self.assertEqual(len(result.errors), 1)
+        error, _ = result.errors[0]
+        self.assertEqual(str(error),
+                    'classSetUp (%s.BrokenTest)' % __name__)
+
+    def test_error_in_teardown_class(self):
+        class Test(unittest.TestCase):
+            tornDown = 0
+            @classmethod
+            def tearDownClass(cls):
+                Test.tornDown += 1
+                raise TypeError('foo')
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        class Test2(unittest.TestCase):
+            tornDown = 0
+            @classmethod
+            def tearDownClass(cls):
+                Test2.tornDown += 1
+                raise TypeError('foo')
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        result = self.runTests(Test, Test2)
+        self.assertEqual(result.testsRun, 4)
+        self.assertEqual(len(result.errors), 2)
+        self.assertEqual(Test.tornDown, 1)
+        self.assertEqual(Test2.tornDown, 1)
+
+        error, _ = result.errors[0]
+        self.assertEqual(str(error),
+                    'classTearDown (%s.Test)' % __name__)
+
+    def test_class_not_torndown_when_setup_fails(self):
+        class Test(unittest.TestCase):
+            tornDown = False
+            @classmethod
+            def setUpClass(cls):
+                raise TypeError
+            @classmethod
+            def tearDownClass(cls):
+                Test.tornDown = True
+                raise TypeError('foo')
+            def test_one(self):
+                pass
+
+        self.runTests(Test)
+        self.assertFalse(Test.tornDown)
+
+    def test_class_not_setup_or_torndown_when_skipped(self):
+        class Test(unittest.TestCase):
+            classSetUp = False
+            tornDown = False
+            @classmethod
+            def setUpClass(cls):
+                Test.classSetUp = True
+            @classmethod
+            def tearDownClass(cls):
+                Test.tornDown = True
+            def test_one(self):
+                pass
+
+        Test = unittest.skip("hop")(Test)
+        self.runTests(Test)
+        self.assertFalse(Test.classSetUp)
+        self.assertFalse(Test.tornDown)
+
+    def test_setup_teardown_order_with_pathological_suite(self):
+        results = []
+
+        class Module1(object):
+            @staticmethod
+            def setUpModule():
+                results.append('Module1.setUpModule')
+            @staticmethod
+            def tearDownModule():
+                results.append('Module1.tearDownModule')
+
+        class Module2(object):
+            @staticmethod
+            def setUpModule():
+                results.append('Module2.setUpModule')
+            @staticmethod
+            def tearDownModule():
+                results.append('Module2.tearDownModule')
+
+        class Test1(unittest.TestCase):
+            @classmethod
+            def setUpClass(cls):
+                results.append('setup 1')
+            @classmethod
+            def tearDownClass(cls):
+                results.append('teardown 1')
+            def testOne(self):
+                results.append('Test1.testOne')
+            def testTwo(self):
+                results.append('Test1.testTwo')
+
+        class Test2(unittest.TestCase):
+            @classmethod
+            def setUpClass(cls):
+                results.append('setup 2')
+            @classmethod
+            def tearDownClass(cls):
+                results.append('teardown 2')
+            def testOne(self):
+                results.append('Test2.testOne')
+            def testTwo(self):
+                results.append('Test2.testTwo')
+
+        class Test3(unittest.TestCase):
+            @classmethod
+            def setUpClass(cls):
+                results.append('setup 3')
+            @classmethod
+            def tearDownClass(cls):
+                results.append('teardown 3')
+            def testOne(self):
+                results.append('Test3.testOne')
+            def testTwo(self):
+                results.append('Test3.testTwo')
+
+        Test1.__module__ = Test2.__module__ = 'Module'
+        Test3.__module__ = 'Module2'
+        sys.modules['Module'] = Module1
+        sys.modules['Module2'] = Module2
+
+        first = unittest.TestSuite((Test1('testOne'),))
+        second = unittest.TestSuite((Test1('testTwo'),))
+        third = unittest.TestSuite((Test2('testOne'),))
+        fourth = unittest.TestSuite((Test2('testTwo'),))
+        fifth = unittest.TestSuite((Test3('testOne'),))
+        sixth = unittest.TestSuite((Test3('testTwo'),))
+        suite = unittest.TestSuite((first, second, third, fourth, fifth, sixth))
+
+        runner = self.getRunner()
+        result = runner.run(suite)
+        self.assertEqual(result.testsRun, 6)
+        self.assertEqual(len(result.errors), 0)
+
+        self.assertEqual(results,
+                         ['Module1.setUpModule', 'setup 1',
+                          'Test1.testOne', 'Test1.testTwo', 'teardown 1',
+                          'setup 2', 'Test2.testOne', 'Test2.testTwo',
+                          'teardown 2', 'Module1.tearDownModule',
+                          'Module2.setUpModule', 'setup 3',
+                          'Test3.testOne', 'Test3.testTwo',
+                          'teardown 3', 'Module2.tearDownModule'])
+
+    def test_setup_module(self):
+        class Module(object):
+            moduleSetup = 0
+            @staticmethod
+            def setUpModule():
+                Module.moduleSetup += 1
+
+        class Test(unittest.TestCase):
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        Test.__module__ = 'Module'
+        sys.modules['Module'] = Module
+
+        result = self.runTests(Test)
+        self.assertEqual(Module.moduleSetup, 1)
+        self.assertEqual(result.testsRun, 2)
+        self.assertEqual(len(result.errors), 0)
+
+    def test_error_in_setup_module(self):
+        class Module(object):
+            moduleSetup = 0
+            moduleTornDown = 0
+            @staticmethod
+            def setUpModule():
+                Module.moduleSetup += 1
+                raise TypeError('foo')
+            @staticmethod
+            def tearDownModule():
+                Module.moduleTornDown += 1
+
+        class Test(unittest.TestCase):
+            classSetUp = False
+            classTornDown = False
+            @classmethod
+            def setUpClass(cls):
+                Test.classSetUp = True
+            @classmethod
+            def tearDownClass(cls):
+                Test.classTornDown = True
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        class Test2(unittest.TestCase):
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        Test.__module__ = 'Module'
+        Test2.__module__ = 'Module'
+        sys.modules['Module'] = Module
+
+        result = self.runTests(Test, Test2)
+        self.assertEqual(Module.moduleSetup, 1)
+        self.assertEqual(Module.moduleTornDown, 0)
+        self.assertEqual(result.testsRun, 0)
+        self.assertFalse(Test.classSetUp)
+        self.assertFalse(Test.classTornDown)
+        self.assertEqual(len(result.errors), 1)
+        error, _ = result.errors[0]
+        self.assertEqual(str(error), 'setUpModule (Module)')
+
+    def test_testcase_with_missing_module(self):
+        class Test(unittest.TestCase):
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        Test.__module__ = 'Module'
+        sys.modules.pop('Module', None)
+
+        result = self.runTests(Test)
+        self.assertEqual(result.testsRun, 2)
+
+    def test_teardown_module(self):
+        class Module(object):
+            moduleTornDown = 0
+            @staticmethod
+            def tearDownModule():
+                Module.moduleTornDown += 1
+
+        class Test(unittest.TestCase):
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        Test.__module__ = 'Module'
+        sys.modules['Module'] = Module
+
+        result = self.runTests(Test)
+        self.assertEqual(Module.moduleTornDown, 1)
+        self.assertEqual(result.testsRun, 2)
+        self.assertEqual(len(result.errors), 0)
+
+    def test_error_in_teardown_module(self):
+        class Module(object):
+            moduleTornDown = 0
+            @staticmethod
+            def tearDownModule():
+                Module.moduleTornDown += 1
+                raise TypeError('foo')
+
+        class Test(unittest.TestCase):
+            classSetUp = False
+            classTornDown = False
+            @classmethod
+            def setUpClass(cls):
+                Test.classSetUp = True
+            @classmethod
+            def tearDownClass(cls):
+                Test.classTornDown = True
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+
+        class Test2(unittest.TestCase):
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        Test.__module__ = 'Module'
+        Test2.__module__ = 'Module'
+        sys.modules['Module'] = Module
+
+        result = self.runTests(Test, Test2)
+        self.assertEqual(Module.moduleTornDown, 1)
+        self.assertEqual(result.testsRun, 4)
+        self.assertTrue(Test.classSetUp)
+        self.assertTrue(Test.classTornDown)
+        self.assertEqual(len(result.errors), 1)
+        error, _ = result.errors[0]
+        self.assertEqual(str(error), 'tearDownModule (Module)')
+
 ######################################################################
 ## Main
 ######################################################################
@@ -3803,7 +4316,8 @@ def test_main():
     support.run_unittest(Test_TestCase, Test_TestLoader,
         Test_TestSuite, Test_TestResult, Test_FunctionTestCase,
         Test_TestSkipping, Test_Assertions, TestLongMessage,
-        Test_TestProgram, TestCleanUp, TestDiscovery, Test_TextTestRunner)
+        Test_TestProgram, TestCleanUp, TestDiscovery, Test_TextTestRunner,
+        Test_OldTestResult, TestSetups)
 
 if __name__ == "__main__":
     test_main()
diff --git a/Lib/unittest/__init__.py b/Lib/unittest/__init__.py
index 4a308fa..06fe55d 100644
--- a/Lib/unittest/__init__.py
+++ b/Lib/unittest/__init__.py
@@ -51,13 +51,12 @@ __all__ = ['TestResult', 'TestCase', 'TestSuite',
 
 # Expose obsolete functions for backwards compatibility
 __all__.extend(['getTestCaseNames', 'makeSuite', 'findTestCases'])
-__all__.append('_TextTestResult')
 
 
 from .result import TestResult
 from .case import (TestCase, FunctionTestCase, SkipTest, skip, skipIf,
                    skipUnless, expectedFailure)
-from .suite import TestSuite
+from .suite import BaseTestSuite, TestSuite
 from .loader import (TestLoader, defaultTestLoader, makeSuite, getTestCaseNames,
                      findTestCases)
 from .main import TestProgram, main
diff --git a/Lib/unittest/case.py b/Lib/unittest/case.py
index cc121e5..8900915 100644
--- a/Lib/unittest/case.py
+++ b/Lib/unittest/case.py
@@ -7,7 +7,9 @@ import pprint
 import re
 import warnings
 
-from . import result, util
+from . import result
+from .util import (strclass, safe_repr, sorted_list_difference,
+                   unorderable_list_difference)
 
 
 class SkipTest(Exception):
@@ -44,14 +46,15 @@ def skip(reason):
     Unconditionally skip a test.
     """
     def decorator(test_item):
-        if isinstance(test_item, type) and issubclass(test_item, TestCase):
-            test_item.__unittest_skip__ = True
-            test_item.__unittest_skip_why__ = reason
-            return test_item
-        @functools.wraps(test_item)
-        def skip_wrapper(*args, **kwargs):
-            raise SkipTest(reason)
-        return skip_wrapper
+        if not (isinstance(test_item, type) and issubclass(test_item, TestCase)):
+            @functools.wraps(test_item)
+            def skip_wrapper(*args, **kwargs):
+                raise SkipTest(reason)
+            test_item = skip_wrapper
+
+        test_item.__unittest_skip__ = True
+        test_item.__unittest_skip_why__ = reason
+        return test_item
     return decorator
 
 def skipIf(condition, reason):
@@ -164,6 +167,9 @@ class TestCase(object):
 
     longMessage = False
 
+    # Attribute used by TestSuite for classSetUp
+
+    _classSetupFailed = False
 
     def __init__(self, methodName='runTest'):
         """Create an instance of the class that will use the named test
@@ -175,7 +181,7 @@ class TestCase(object):
         try:
             testMethod = getattr(self, methodName)
         except AttributeError:
-            raise ValueError("no such test method in %s: %s" % \
+            raise ValueError("no such test method in %s: %s" %
                   (self.__class__, methodName))
         self._testMethodDoc = testMethod.__doc__
         self._cleanups = []
@@ -222,6 +228,14 @@ class TestCase(object):
         "Hook method for deconstructing the test fixture after testing it."
         pass
 
+    @classmethod
+    def setUpClass(cls):
+        "Hook method for setting up class fixture before running tests in the class."
+
+    @classmethod
+    def tearDownClass(cls):
+        "Hook method for deconstructing the class fixture after running all tests in the class."
+
     def countTestCases(self):
         return 1
 
@@ -240,7 +254,7 @@ class TestCase(object):
 
 
     def id(self):
-        return "%s.%s" % (util.strclass(self.__class__), self._testMethodName)
+        return "%s.%s" % (strclass(self.__class__), self._testMethodName)
 
     def __eq__(self, other):
         if type(self) is not type(other):
@@ -255,11 +269,20 @@ class TestCase(object):
         return hash((type(self), self._testMethodName))
 
     def __str__(self):
-        return "%s (%s)" % (self._testMethodName, util.strclass(self.__class__))
+        return "%s (%s)" % (self._testMethodName, strclass(self.__class__))
 
     def __repr__(self):
         return "<%s testMethod=%s>" % \
-               (util.strclass(self.__class__), self._testMethodName)
+               (strclass(self.__class__), self._testMethodName)
+
+    def _addSkip(self, result, reason):
+        addSkip = getattr(result, 'addSkip', None)
+        if addSkip is not None:
+            addSkip(self, reason)
+        else:
+            warnings.warn("TestResult has no addSkip method, skips not reported",
+                          RuntimeWarning, 2)
+            result.addSuccess(self)
 
     def run(self, result=None):
         orig_result = result
@@ -271,20 +294,24 @@ class TestCase(object):
 
         self._resultForDoCleanups = result
         result.startTest(self)
-        if getattr(self.__class__, "__unittest_skip__", False):
-            # If the whole class was skipped.
+
+        testMethod = getattr(self, self._testMethodName)
+        if (getattr(self.__class__, "__unittest_skip__", False) or
+            getattr(testMethod, "__unittest_skip__", False)):
+            # If the class or method was skipped.
             try:
-                result.addSkip(self, self.__class__.__unittest_skip_why__)
+                skip_why = (getattr(self.__class__, '__unittest_skip_why__', '')
+                            or getattr(testMethod, '__unittest_skip_why__', ''))
+                self._addSkip(result, skip_why)
             finally:
                 result.stopTest(self)
             return
-        testMethod = getattr(self, self._testMethodName)
         try:
             success = False
             try:
                 self.setUp()
             except SkipTest as e:
-                result.addSkip(self, str(e))
+                self._addSkip(result, str(e))
             except Exception:
                 result.addError(self, sys.exc_info())
             else:
@@ -293,11 +320,23 @@ class TestCase(object):
                 except self.failureException:
                     result.addFailure(self, sys.exc_info())
                 except _ExpectedFailure as e:
-                    result.addExpectedFailure(self, e.exc_info)
+                    addExpectedFailure = getattr(result, 'addExpectedFailure', None)
+                    if addExpectedFailure is not None:
+                        addExpectedFailure(self, e.exc_info)
+                    else:
+                        warnings.warn("TestResult has no addExpectedFailure method, reporting as passes",
+                                      RuntimeWarning)
+                        result.addSuccess(self)
                 except _UnexpectedSuccess:
-                    result.addUnexpectedSuccess(self)
+                    addUnexpectedSuccess = getattr(result, 'addUnexpectedSuccess', None)
+                    if addUnexpectedSuccess is not None:
+                        addUnexpectedSuccess(self)
+                    else:
+                        warnings.warn("TestResult has no addUnexpectedSuccess method, reporting as failures",
+                                      RuntimeWarning)
+                        result.addFailure(self, sys.exc_info())
                 except SkipTest as e:
-                    result.addSkip(self, str(e))
+                    self._addSkip(result, str(e))
                 except Exception:
                     result.addError(self, sys.exc_info())
                 else:
@@ -354,13 +393,13 @@ class TestCase(object):
     def assertFalse(self, expr, msg=None):
         "Fail the test if the expression is true."
         if expr:
-            msg = self._formatMessage(msg, "%r is not False" % expr)
+            msg = self._formatMessage(msg, "%s is not False" % safe_repr(expr))
             raise self.failureException(msg)
 
     def assertTrue(self, expr, msg=None):
         """Fail the test unless the expression is true."""
         if not expr:
-            msg = self._formatMessage(msg, "%r is not True" % expr)
+            msg = self._formatMessage(msg, "%s is not True" % safe_repr(expr))
             raise self.failureException(msg)
 
     def _formatMessage(self, msg, standardMsg):
@@ -377,7 +416,12 @@ class TestCase(object):
             return msg or standardMsg
         if msg is None:
             return standardMsg
-        return standardMsg + ' : ' + msg
+        try:
+            # don't switch to '{}' formatting in Python 2.X
+            # it changes the way unicode input is handled
+            return '%s : %s' % (standardMsg, msg)
+        except UnicodeDecodeError:
+            return  '%s : %s' % (safe_repr(standardMsg), safe_repr(msg))
 
 
     def assertRaises(self, excClass, callableObj=None, *args, **kwargs):
@@ -436,7 +480,7 @@ class TestCase(object):
     def _baseAssertEqual(self, first, second, msg=None):
         """The default assertEqual implementation, not type specific."""
         if not first == second:
-            standardMsg = '%r != %r' % (first, second)
+            standardMsg = '%s != %s' % (safe_repr(first), safe_repr(second))
             msg = self._formatMessage(msg, standardMsg)
             raise self.failureException(msg)
 
@@ -452,7 +496,8 @@ class TestCase(object):
            operator.
         """
         if not first != second:
-            msg = self._formatMessage(msg, '%r == %r' % (first, second))
+            msg = self._formatMessage(msg, '%s == %s' % (safe_repr(first),
+                                                          safe_repr(second)))
             raise self.failureException(msg)
 
     def assertAlmostEqual(self, first, second, *, places=7, msg=None):
@@ -467,10 +512,12 @@ class TestCase(object):
            compare almost equal.
         """
         if first == second:
-            # shortcut for ite
+            # shortcut for inf
             return
         if round(abs(second-first), places) != 0:
-            standardMsg = '%r != %r within %r places' % (first, second, places)
+            standardMsg = '%s != %s within %r places' % (safe_repr(first),
+                                                          safe_repr(second),
+                                                          places)
             msg = self._formatMessage(msg, standardMsg)
             raise self.failureException(msg)
 
@@ -485,7 +532,9 @@ class TestCase(object):
            Objects that are equal automatically fail.
         """
         if (first == second) or round(abs(second-first), places) == 0:
-            standardMsg = '%r == %r within %r places' % (first, second, places)
+            standardMsg = '%s == %s within %r places' % (safe_repr(first),
+                                                          safe_repr(second),
+                                                          places)
             msg = self._formatMessage(msg, standardMsg)
             raise self.failureException(msg)
 
@@ -535,11 +584,11 @@ class TestCase(object):
         if seq_type != None:
             seq_type_name = seq_type.__name__
             if not isinstance(seq1, seq_type):
-                raise self.failureException('First sequence is not a %s: %r'
-                                            % (seq_type_name, seq1))
+                raise self.failureException('First sequence is not a %s: %s'
+                                        % (seq_type_name, safe_repr(seq1)))
             if not isinstance(seq2, seq_type):
-                raise self.failureException('Second sequence is not a %s: %r'
-                                            % (seq_type_name, seq2))
+                raise self.failureException('Second sequence is not a %s: %s'
+                                        % (seq_type_name, safe_repr(seq2)))
         else:
             seq_type_name = "sequence"
 
@@ -561,8 +610,8 @@ class TestCase(object):
             if seq1 == seq2:
                 return
 
-            seq1_repr = repr(seq1)
-            seq2_repr = repr(seq2)
+            seq1_repr = safe_repr(seq1)
+            seq2_repr = safe_repr(seq2)
             if len(seq1_repr) > 30:
                 seq1_repr = seq1_repr[:30] + '...'
             if len(seq2_repr) > 30:
@@ -689,25 +738,28 @@ class TestCase(object):
     def assertIn(self, member, container, msg=None):
         """Just like self.assertTrue(a in b), but with a nicer default message."""
         if member not in container:
-            standardMsg = '%r not found in %r' % (member, container)
+            standardMsg = '%s not found in %s' % (safe_repr(member),
+                                                  safe_repr(container))
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertNotIn(self, member, container, msg=None):
         """Just like self.assertTrue(a not in b), but with a nicer default message."""
         if member in container:
-            standardMsg = '%r unexpectedly found in %r' % (member, container)
+            standardMsg = '%s unexpectedly found in %s' % (safe_repr(member),
+                                                        safe_repr(container))
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertIs(self, expr1, expr2, msg=None):
         """Just like self.assertTrue(a is b), but with a nicer default message."""
         if expr1 is not expr2:
-            standardMsg = '%r is not %r' % (expr1, expr2)
+            standardMsg = '%s is not %s' % (safe_repr(expr1),
+                                             safe_repr(expr2))
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertIsNot(self, expr1, expr2, msg=None):
         """Just like self.assertTrue(a is not b), but with a nicer default message."""
         if expr1 is expr2:
-            standardMsg = 'unexpectedly identical: %r' % (expr1,)
+            standardMsg = 'unexpectedly identical: %s' % (safe_repr(expr1),)
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertDictEqual(self, d1, d2, msg=None):
@@ -729,14 +781,16 @@ class TestCase(object):
                 missing.append(key)
             elif value != actual[key]:
                 mismatched.append('%s, expected: %s, actual: %s' %
-                                  (key, value, actual[key]))
+                                  (safe_repr(key), safe_repr(value),
+                                   safe_repr(actual[key])))
 
         if not (missing or mismatched):
             return
 
         standardMsg = ''
         if missing:
-            standardMsg = 'Missing: %r' % ','.join(missing)
+            standardMsg = 'Missing: %s' % ','.join(safe_repr(m) for m in
+                                                    missing)
         if mismatched:
             if standardMsg:
                 standardMsg += '; '
@@ -758,10 +812,8 @@ class TestCase(object):
         try:
             expected = set(expected_seq)
             actual = set(actual_seq)
-            missing = list(expected.difference(actual))
-            unexpected = list(actual.difference(expected))
-            missing.sort()
-            unexpected.sort()
+            missing = sorted(expected.difference(actual))
+            unexpected = sorted(actual.difference(expected))
         except TypeError:
             # Fall back to slower list-compare if any of the objects are
             # not hashable.
@@ -771,16 +823,17 @@ class TestCase(object):
                 expected.sort()
                 actual.sort()
             except TypeError:
-                missing, unexpected = util.unorderable_list_difference(expected,
-                                                                       actual)
-            else:
-                missing, unexpected = util.sorted_list_difference(expected,
+                missing, unexpected = unorderable_list_difference(expected,
                                                                   actual)
+            else:
+                missing, unexpected = sorted_list_difference(expected, actual)
         errors = []
         if missing:
-            errors.append('Expected, but missing:\n    %r' % missing)
+            errors.append('Expected, but missing:\n    %s' %
+                          safe_repr(missing))
         if unexpected:
-            errors.append('Unexpected, but present:\n    %r' % unexpected)
+            errors.append('Unexpected, but present:\n    %s' %
+                          safe_repr(unexpected))
         if errors:
             standardMsg = '\n'.join(errors)
             self.fail(self._formatMessage(msg, standardMsg))
@@ -800,31 +853,31 @@ class TestCase(object):
     def assertLess(self, a, b, msg=None):
         """Just like self.assertTrue(a < b), but with a nicer default message."""
         if not a < b:
-            standardMsg = '%r not less than %r' % (a, b)
+            standardMsg = '%s not less than %s' % (safe_repr(a), safe_repr(b))
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertLessEqual(self, a, b, msg=None):
         """Just like self.assertTrue(a <= b), but with a nicer default message."""
         if not a <= b:
-            standardMsg = '%r not less than or equal to %r' % (a, b)
+            standardMsg = '%s not less than or equal to %s' % (safe_repr(a), safe_repr(b))
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertGreater(self, a, b, msg=None):
         """Just like self.assertTrue(a > b), but with a nicer default message."""
         if not a > b:
-            standardMsg = '%r not greater than %r' % (a, b)
+            standardMsg = '%s not greater than %s' % (safe_repr(a), safe_repr(b))
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertGreaterEqual(self, a, b, msg=None):
         """Just like self.assertTrue(a >= b), but with a nicer default message."""
         if not a >= b:
-            standardMsg = '%r not greater than or equal to %r' % (a, b)
+            standardMsg = '%s not greater than or equal to %s' % (safe_repr(a), safe_repr(b))
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertIsNone(self, obj, msg=None):
         """Same as self.assertTrue(obj is None), with a nicer default message."""
         if obj is not None:
-            standardMsg = '%r is not None' % obj
+            standardMsg = '%s is not None' % (safe_repr(obj),)
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertIsNotNone(self, obj, msg=None):
@@ -837,13 +890,13 @@ class TestCase(object):
         """Same as self.assertTrue(isinstance(obj, cls)), with a nicer
         default message."""
         if not isinstance(obj, cls):
-            standardMsg = '%r is not an instance of %r' % (obj, cls)
+            standardMsg = '%s is not an instance of %r' % (safe_repr(obj), cls)
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertNotIsInstance(self, obj, cls, msg=None):
         """Included for symmetry with assertIsInstance."""
         if isinstance(obj, cls):
-            standardMsg = '%r is an instance of %r' % (obj, cls)
+            standardMsg = '%s is an instance of %r' % (safe_repr(obj), cls)
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertRaisesRegexp(self, expected_exception, expected_regexp,
@@ -921,11 +974,11 @@ class FunctionTestCase(TestCase):
                      self._testFunc, self._description))
 
     def __str__(self):
-        return "%s (%s)" % (util.strclass(self.__class__),
+        return "%s (%s)" % (strclass(self.__class__),
                             self._testFunc.__name__)
 
     def __repr__(self):
-        return "<%s testFunc=%s>" % (util.strclass(self.__class__),
+        return "<%s tec=%s>" % (strclass(self.__class__),
                                      self._testFunc)
 
     def shortDescription(self):
diff --git a/Lib/unittest/result.py b/Lib/unittest/result.py
index 4538304..746967e 100644
--- a/Lib/unittest/result.py
+++ b/Lib/unittest/result.py
@@ -16,7 +16,9 @@ class TestResult(object):
     contain tuples of (testcase, exceptioninfo), where exceptioninfo is the
     formatted traceback of the error that occurred.
     """
-    def __init__(self):
+    _previousTestClass = None
+    _moduleSetUpFailed = False
+    def __init__(self, stream=None, descriptions=None, verbosity=None):
         self.failures = []
         self.errors = []
         self.testsRun = 0
@@ -25,6 +27,9 @@ class TestResult(object):
         self.unexpectedSuccesses = []
         self.shouldStop = False
 
+    def printErrors(self):
+        "Called by TestRunner after test run"
+
     def startTest(self, test):
         "Called when the given test is about to be run"
         self.testsRun += 1
@@ -107,6 +112,6 @@ class TestResult(object):
         return length
 
     def __repr__(self):
-        return "<%s run=%i errors=%i failures=%i>" % \
+        return ("<%s run=%i errors=%i failures=%i>" %
                (util.strclass(self.__class__), self.testsRun, len(self.errors),
-                len(self.failures))
+                len(self.failures)))
diff --git a/Lib/unittest/runner.py b/Lib/unittest/runner.py
index 3f45f73..8773d0c 100644
--- a/Lib/unittest/runner.py
+++ b/Lib/unittest/runner.py
@@ -148,15 +148,22 @@ class TextTestRunner(object):
         stopTime = time.time()
         timeTaken = stopTime - startTime
         result.printErrors()
-        self.stream.writeln(result.separator2)
+        if hasattr(result, 'separator2'):
+            self.stream.writeln(result.separator2)
         run = result.testsRun
         self.stream.writeln("Ran %d test%s in %.3fs" %
                             (run, run != 1 and "s" or "", timeTaken))
         self.stream.writeln()
-        results = map(len, (result.expectedFailures,
-                            result.unexpectedSuccesses,
-                            result.skipped))
-        expectedFails, unexpectedSuccesses, skipped = results
+
+        expectedFails = unexpectedSuccesses = skipped = 0
+        try:
+            results = map(len, (result.expectedFailures,
+                                result.unexpectedSuccesses,
+                                result.skipped))
+            expectedFails, unexpectedSuccesses, skipped = results
+        except AttributeError:
+            pass
+
         infos = []
         if not result.wasSuccessful():
             self.stream.write("FAILED")
diff --git a/Lib/unittest/suite.py b/Lib/unittest/suite.py
index 35b7d91..ddd83ae 100644
--- a/Lib/unittest/suite.py
+++ b/Lib/unittest/suite.py
@@ -1,17 +1,13 @@
 """TestSuite"""
 
+import sys
+
 from . import case
 from . import util
 
 
-class TestSuite(object):
-    """A test suite is a composite test consisting of a number of TestCases.
-
-    For use, create an instance of TestSuite, then add test case instances.
-    When all tests have been added, the suite can be passed to a test
-    runner, such as TextTestRunner. It will run the individual test cases
-    in the order in which they were added, aggregating the results. When
-    subclassing, do not forget to call the base class constructor.
+class BaseTestSuite(object):
+    """A simple test suite that doesn't provide class or module shared fixtures.
     """
     def __init__(self, tests=()):
         self._tests = []
@@ -67,3 +63,190 @@ class TestSuite(object):
         """Run the tests without collecting errors in a TestResult"""
         for test in self:
             test.debug()
+
+
+class TestSuite(BaseTestSuite):
+    """A test suite is a composite test consisting of a number of TestCases.
+
+    For use, create an instance of TestSuite, then add test case instances.
+    When all tests have been added, the suite can be passed to a test
+    runner, such as TextTestRunner. It will run the individual test cases
+    in the order in which they were added, aggregating the results. When
+    subclassing, do not forget to call the base class constructor.
+    """
+
+
+    def run(self, result):
+        self._wrapped_run(result)
+        self._tearDownPreviousClass(None, result)
+        self._handleModuleTearDown(result)
+        return result
+
+    ################################
+    # private methods
+    def _wrapped_run(self, result):
+        for test in self:
+            if result.shouldStop:
+                break
+
+            if _isnotsuite(test):
+                self._tearDownPreviousClass(test, result)
+                self._handleModuleFixture(test, result)
+                self._handleClassSetUp(test, result)
+                result._previousTestClass = test.__class__
+
+                if (getattr(test.__class__, '_classSetupFailed', False) or
+                    getattr(result, '_moduleSetUpFailed', False)):
+                    continue
+
+            if hasattr(test, '_wrapped_run'):
+                test._wrapped_run(result)
+            else:
+                test(result)
+
+    def _handleClassSetUp(self, test, result):
+        previousClass = getattr(result, '_previousTestClass', None)
+        currentClass = test.__class__
+        if currentClass == previousClass:
+            return
+        if result._moduleSetUpFailed:
+            return
+        if getattr(currentClass, "__unittest_skip__", False):
+            return
+
+        currentClass._classSetupFailed = False
+
+        setUpClass = getattr(currentClass, 'setUpClass', None)
+        if setUpClass is not None:
+            try:
+                setUpClass()
+            except:
+                currentClass._classSetupFailed = True
+                self._addClassSetUpError(result, currentClass)
+
+    def _get_previous_module(self, result):
+        previousModule = None
+        previousClass = getattr(result, '_previousTestClass', None)
+        if previousClass is not None:
+            previousModule = previousClass.__module__
+        return previousModule
+
+
+    def _handleModuleFixture(self, test, result):
+        previousModule = self._get_previous_module(result)
+        currentModule = test.__class__.__module__
+        if currentModule == previousModule:
+            return
+
+        self._handleModuleTearDown(result)
+
+
+        result._moduleSetUpFailed = False
+        try:
+            module = sys.modules[currentModule]
+        except KeyError:
+            return
+        setUpModule = getattr(module, 'setUpModule', None)
+        if setUpModule is not None:
+            try:
+                setUpModule()
+            except:
+                result._moduleSetUpFailed = True
+                error = _ErrorHolder('setUpModule (%s)' % currentModule)
+                result.addError(error, sys.exc_info())
+
+    def _handleModuleTearDown(self, result):
+        previousModule = self._get_previous_module(result)
+        if previousModule is None:
+            return
+        if result._moduleSetUpFailed:
+            return
+
+        try:
+            module = sys.modules[previousModule]
+        except KeyError:
+            return
+
+        tearDownModule = getattr(module, 'tearDownModule', None)
+        if tearDownModule is not None:
+            try:
+                tearDownModule()
+            except:
+                error = _ErrorHolder('tearDownModule (%s)' % previousModule)
+                result.addError(error, sys.exc_info())
+
+    def _tearDownPreviousClass(self, test, result):
+        previousClass = getattr(result, '_previousTestClass', None)
+        currentClass = test.__class__
+        if currentClass == previousClass:
+            return
+        if getattr(previousClass, '_classSetupFailed', False):
+            return
+        if getattr(result, '_moduleSetUpFailed', False):
+            return
+        if getattr(previousClass, "__unittest_skip__", False):
+            return
+
+        tearDownClass = getattr(previousClass, 'tearDownClass', None)
+        if tearDownClass is not None:
+            try:
+                tearDownClass()
+            except:
+                self._addClassTearDownError(result)
+
+    def _addClassTearDownError(self, result):
+        className = util.strclass(result._previousTestClass)
+        error = _ErrorHolder('classTearDown (%s)' % className)
+        result.addError(error, sys.exc_info())
+
+    def _addClassSetUpError(self, result, klass):
+        className = util.strclass(klass)
+        error = _ErrorHolder('classSetUp (%s)' % className)
+        result.addError(error, sys.exc_info())
+
+
+class _ErrorHolder(object):
+    """
+    Placeholder for a TestCase inside a result. As far as a TestResult
+    is concerned, this looks exactly like a unit test. Used to insert
+    arbitrary errors into a test suite run.
+    """
+    # Inspired by the ErrorHolder from Twisted:
+    # http://twistedmatrix.com/trac/browser/trunk/twisted/trial/runner.py
+
+    # attribute used by TestResult._exc_info_to_string
+    failureException = None
+
+    def __init__(self, description):
+        self.description = description
+
+    def id(self):
+        return self.description
+
+    def shortDescription(self):
+        return None
+
+    def __repr__(self):
+        return "<ErrorHolder description=%r>" % (self.description,)
+
+    def __str__(self):
+        return self.id()
+
+    def run(self, result):
+        # could call result.addError(...) - but this test-like object
+        # shouldn't be run anyway
+        pass
+
+    def __call__(self, result):
+        return self.run(result)
+
+    def countTestCases(self):
+        return 0
+
+def _isnotsuite(test):
+    "A crude way to tell apart testcases and suites with duck-typing"
+    try:
+        iter(test)
+    except TypeError:
+        return True
+    return False
diff --git a/Lib/unittest/util.py b/Lib/unittest/util.py
index 26805de..1c1b600 100644
--- a/Lib/unittest/util.py
+++ b/Lib/unittest/util.py
@@ -1,5 +1,11 @@
 """Various utility functions."""
 
+def safe_repr(obj):
+    try:
+        return repr(obj)
+    except Exception:
+        return object.__repr__(obj)
+
 def strclass(cls):
     return "%s.%s" % (cls.__module__, cls.__name__)