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
........

6 files changed, 331 insertions, 78 deletions

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__)