text: """Test case implementation"""
  
  import collections
  import sys
  import functools
  import difflib
  import pprint
  import re
  import types
  import warnings
  
  # from . import result
  import unittest_result as result
  import unittest_util as _util
  # from .util import (
  #     strclass, safe_repr, unorderable_list_difference,
  #     _count_diff_all_purpose, _count_diff_hashable
  # )
  strclass, safe_repr, unorderable_list_difference, _count_diff_all_purpose, \
    _count_diff_hashable = _util.strclass, _util.safe_repr, \
    _util.unorderable_list_difference, _util._count_diff_all_purpose, \
    _util._count_diff_hashable
  
  class KeyboardInterrupt(BaseException):
      pass
  
  
  __unittest = True
  
  
  DIFF_OMITTED = ('\nDiff is %s characters long. '
                   'Set self.maxDiff to None to see it.')
  
  class SkipTest(Exception):
      """
      Raise this exception in a test to skip it.
  
      Usually you can use TestCase.skipTest() or one of the skipping decorators
      instead of raising this directly.
      """
      pass
  
  class _ExpectedFailure(Exception):
      """
      Raise this when a test is expected to fail.
  
      This is an implementation detail.
      """
  
      def __init__(self, exc_info):
          super(_ExpectedFailure, self).__init__()
          self.exc_info = exc_info
  
  class _UnexpectedSuccess(Exception):
      """
      The test was supposed to fail, but it didn't!
      """
      pass
  
  def _id(obj):
      return obj
  
  def skip(reason):
      """
      Unconditionally skip a test.
      """
      def decorator(test_item):
          if not isinstance(test_item, (type, types.ClassType)):
              # @functools.wraps(test_item)
              def skip_wrapper(*args, **kwargs):
                  raise SkipTest(reason)
              skip_wrapper = functools.wraps(test_item)(skip_wrapper)
              test_item = skip_wrapper
  
          test_item.__unittest_skip__ = True
          test_item.__unittest_skip_why__ = reason
          return test_item
      return decorator
  
  def skipIf(condition, reason):
      """
      Skip a test if the condition is true.
      """
      if condition:
          return skip(reason)
      return _id
  
  def skipUnless(condition, reason):
      """
      Skip a test unless the condition is true.
      """
      if not condition:
          return skip(reason)
      return _id
  
  
  def expectedFailure(func):
      # @functools.wraps(func)
      def wrapper(*args, **kwargs):
          try:
              func(*args, **kwargs)
          except Exception:
              raise _ExpectedFailure(sys.exc_info())
          raise _UnexpectedSuccess
      wrapper = functools.wraps(func)(wrapper)
      return wrapper
  
  
  class _AssertRaisesContext(object):
      """A context manager used to implement TestCase.assertRaises* methods."""
  
      def __init__(self, expected, test_case, expected_regexp=None):
          self.expected = expected
          self.failureException = test_case.failureException
          self.expected_regexp = expected_regexp
  
      def __enter__(self):
          return self
  
      def __exit__(self, exc_type, exc_value, tb):
          if exc_type is None:
              try:
                  exc_name = self.expected.__name__
              except AttributeError:
                  exc_name = str(self.expected)
              raise self.failureException(
                  # "{0} not raised".format(exc_name))
                  "%s not raised" % (exc_name))
          if not issubclass(exc_type, self.expected):
              # let unexpected exceptions pass through
              return False
          self.exception = exc_value # store for later retrieval
          if self.expected_regexp is None:
              return True
  
          expected_regexp = self.expected_regexp
          if not expected_regexp.search(str(exc_value)):
              raise self.failureException('"%s" does not match "%s"' %
                       (expected_regexp.pattern, str(exc_value)))
          return True
  
  
  class TestCase(object):
      """A class whose instances are single test cases.
  
      By default, the test code itself should be placed in a method named
      'runTest'.
  
      If the fixture may be used for many test cases, create as
      many test methods as are needed. When instantiating such a TestCase
      subclass, specify in the constructor arguments the name of the test method
      that the instance is to execute.
  
      Test authors should subclass TestCase for their own tests. Construction
      and deconstruction of the test's environment ('fixture') can be
      implemented by overriding the 'setUp' and 'tearDown' methods respectively.
  
      If it is necessary to override the __init__ method, the base class
      __init__ method must always be called. It is important that subclasses
      should not change the signature of their __init__ method, since instances
      of the classes are instantiated automatically by parts of the framework
      in order to be run.
  
      When subclassing TestCase, you can set these attributes:
      * failureException: determines which exception will be raised when
          the instance's assertion methods fail; test methods raising this
          exception will be deemed to have 'failed' rather than 'errored'.
      * longMessage: determines whether long messages (including repr of
          objects used in assert methods) will be printed on failure in *addition*
          to any explicit message passed.
      * maxDiff: sets the maximum length of a diff in failure messages
          by assert methods using difflib. It is looked up as an instance
          attribute so can be configured by individual tests if required.
      """
  
      failureException = AssertionError
  
      longMessage = False
  
      maxDiff = 80*8
  
      # If a string is longer than _diffThreshold, use normal comparison instead
      # of difflib.  See #11763.
      # _diffThreshold = 2**16
      _diffThreshold = 1<<16
  
      # 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
             method when executed. Raises a ValueError if the instance does
             not have a method with the specified name.
          """
          self._testMethodName = methodName
          self._resultForDoCleanups = None
          try:
              testMethod = getattr(self, methodName)
          except AttributeError:
              raise ValueError("no such test method in %s: %s" %
                    (self.__class__, methodName))
          # self._testMethodDoc = testMethod.__doc__
          self._cleanups = []
  
          # Map types to custom assertEqual functions that will compare
          # instances of said type in more detail to generate a more useful
          # error message.
          self._type_equality_funcs = {}
          self.addTypeEqualityFunc(dict, 'assertDictEqual')
          self.addTypeEqualityFunc(list, 'assertListEqual')
          self.addTypeEqualityFunc(tuple, 'assertTupleEqual')
          self.addTypeEqualityFunc(set, 'assertSetEqual')
          self.addTypeEqualityFunc(frozenset, 'assertSetEqual')
          try:
              self.addTypeEqualityFunc(unicode, 'assertMultiLineEqual')
          except NameError:
              # No unicode support in this build
              pass
  
      def addTypeEqualityFunc(self, typeobj, function):
          """Add a type specific assertEqual style function to compare a type.
  
          This method is for use by TestCase subclasses that need to register
          their own type equality functions to provide nicer error messages.
  
          Args:
              typeobj: The data type to call this function on when both values
                      are of the same type in assertEqual().
              function: The callable taking two arguments and an optional
                      msg= argument that raises self.failureException with a
                      useful error message when the two arguments are not equal.
          """
          self._type_equality_funcs[typeobj] = function
  
      def addCleanup(self, function, *args, **kwargs):
          """Add a function, with arguments, to be called when the test is
          completed. Functions added are called on a LIFO basis and are
          called after tearDown on test failure or success.
  
          Cleanup items are called even if setUp fails (unlike tearDown)."""
          self._cleanups.append((function, args, kwargs))
  
      def setUp(self):
          "Hook method for setting up the test fixture before exercising it."
          pass
  
      def tearDown(self):
          "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."
      setUpClass = classmethod(setUpClass)
  
      # @classmethod
      def tearDownClass(cls):
          "Hook method for deconstructing the class fixture after running all tests in the class."
      tearDownClass = classmethod(tearDownClass)
  
      def countTestCases(self):
          return 1
  
      def defaultTestResult(self):
          return result.TestResult()
  
      def shortDescription(self):
          """Returns a one-line description of the test, or None if no
          description has been provided.
  
          The default implementation of this method returns the first line of
          the specified test method's docstring.
          """
          # doc = self._testMethodDoc
          # return doc and doc.split("\n")[0].strip() or None
          return ''
  
  
      def id(self):
          return "%s.%s" % (strclass(self.__class__), self._testMethodName)
  
      def __eq__(self, other):
          if type(self) is not type(other):
              return NotImplemented
  
          return self._testMethodName == other._testMethodName
  
      def __ne__(self, other):
          return not self == other
  
      def __hash__(self):
          return hash((type(self), self._testMethodName))
  
      def __str__(self):
          return "%s (%s)" % (self._testMethodName, strclass(self.__class__))
  
      def __repr__(self):
          return "<%s testMethod=%s>" % \
                 (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
          if result is None:
              result = self.defaultTestResult()
              startTestRun = getattr(result, 'startTestRun', None)
              if startTestRun is not None:
                  startTestRun()
  
          self._resultForDoCleanups = result
          result.startTest(self)
  
          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:
                  skip_why = (getattr(self.__class__, '__unittest_skip_why__', '')
                              or getattr(testMethod, '__unittest_skip_why__', ''))
                  self._addSkip(result, skip_why)
              finally:
                  result.stopTest(self)
              return
          try:
              success = False
              try:
                  self.setUp()
              except SkipTest as e:
                  self._addSkip(result, str(e))
              except KeyboardInterrupt:
                  raise
              except:
                  result.addError(self, sys.exc_info())
              else:
                  try:
                      testMethod()
                  except KeyboardInterrupt:
                      raise
                  except self.failureException:
                      result.addFailure(self, sys.exc_info())
                  except _ExpectedFailure as e:
                      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:
                      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:
                      self._addSkip(result, str(e))
                  except:
                      result.addError(self, sys.exc_info())
                  else:
                      success = True
  
                  try:
                      self.tearDown()
                  except KeyboardInterrupt:
                      raise
                  except:
                      result.addError(self, sys.exc_info())
                      success = False
  
              cleanUpSuccess = self.doCleanups()
              success = success and cleanUpSuccess
              if success:
                  result.addSuccess(self)
          finally:
              result.stopTest(self)
              if orig_result is None:
                  stopTestRun = getattr(result, 'stopTestRun', None)
                  if stopTestRun is not None:
                      stopTestRun()
  
      def doCleanups(self):
          """Execute all cleanup functions. Normally called for you after
          tearDown."""
          result = self._resultForDoCleanups
          ok = True
          while self._cleanups:
              function, args, kwargs = self._cleanups.pop(-1)
              try:
                  function(*args, **kwargs)
              except KeyboardInterrupt:
                  raise
              except:
                  ok = False
                  result.addError(self, sys.exc_info())
          return ok
  
      def __call__(self, *args, **kwds):
          return self.run(*args, **kwds)
  
      def debug(self):
          """Run the test without collecting errors in a TestResult"""
          self.setUp()
          getattr(self, self._testMethodName)()
          self.tearDown()
          while self._cleanups:
              function, args, kwargs = self._cleanups.pop(-1)
              function(*args, **kwargs)
  
      def skipTest(self, reason):
          """Skip this test."""
          raise SkipTest(reason)
  
      def fail(self, msg=None):
          """Fail immediately, with the given message."""
          raise self.failureException(msg)
  
      def assertFalse(self, expr, msg=None):
          """Check that the expression is false."""
          if expr:
              msg = self._formatMessage(msg, "%s is not false" % safe_repr(expr))
              raise self.failureException(msg)
  
      def assertTrue(self, expr, msg=None):
          """Check that the expression is true."""
          if not expr:
              msg = self._formatMessage(msg, "%s is not true" % safe_repr(expr))
              raise self.failureException(msg)
  
      def _formatMessage(self, msg, standardMsg):
          """Honour the longMessage attribute when generating failure messages.
          If longMessage is False this means:
          * Use only an explicit message if it is provided
          * Otherwise use the standard message for the assert
  
          If longMessage is True:
          * Use the standard message
          * If an explicit message is provided, plus ' : ' and the explicit message
          """
          if not self.longMessage:
              return msg or standardMsg
          if msg is None:
              return standardMsg
          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):
          """Fail unless an exception of class excClass is raised
             by callableObj when invoked with arguments args and keyword
             arguments kwargs. If a different type of exception is
             raised, it will not be caught, and the test case will be
             deemed to have suffered an error, exactly as for an
             unexpected exception.
  
             If called with callableObj omitted or None, will return a
             context object used like this::
  
                  with self.assertRaises(SomeException):
                      do_something()
  
             The context manager keeps a reference to the exception as
             the 'exception' attribute. This allows you to inspect the
             exception after the assertion::
  
                 with self.assertRaises(SomeException) as cm:
                     do_something()
                 the_exception = cm.exception
                 self.assertEqual(the_exception.error_code, 3)
          """
          context = _AssertRaisesContext(excClass, self)
          if callableObj is None:
              return context
          with context:
              callableObj(*args, **kwargs)
  
      def _getAssertEqualityFunc(self, first, second):
          """Get a detailed comparison function for the types of the two args.
  
          Returns: A callable accepting (first, second, msg=None) that will
          raise a failure exception if first != second with a useful human
          readable error message for those types.
          """
          #
          # NOTE(gregory.p.smith): I considered isinstance(first, type(second))
          # and vice versa.  I opted for the conservative approach in case
          # subclasses are not intended to be compared in detail to their super
          # class instances using a type equality func.  This means testing
          # subtypes won't automagically use the detailed comparison.  Callers
          # should use their type specific assertSpamEqual method to compare
          # subclasses if the detailed comparison is desired and appropriate.
          # See the discussion in http://bugs.python.org/issue2578.
          #
          if type(first) is type(second):
              asserter = self._type_equality_funcs.get(type(first))
              if asserter is not None:
                  if isinstance(asserter, basestring):
                      asserter = getattr(self, asserter)
                  return asserter
  
          return self._baseAssertEqual
  
      def _baseAssertEqual(self, first, second, msg=None):
          """The default assertEqual implementation, not type specific."""
          if not first == second:
              standardMsg = '%s != %s' % (safe_repr(first), safe_repr(second))
              msg = self._formatMessage(msg, standardMsg)
              raise self.failureException(msg)
  
      def assertEqual(self, first, second, msg=None):
          """Fail if the two objects are unequal as determined by the '=='
             operator.
          """
          assertion_func = self._getAssertEqualityFunc(first, second)
          assertion_func(first, second, msg=msg)
  
      def assertNotEqual(self, first, second, msg=None):
          """Fail if the two objects are equal as determined by the '!='
             operator.
          """
          if not first != second:
              msg = self._formatMessage(msg, '%s == %s' % (safe_repr(first),
                                                            safe_repr(second)))
              raise self.failureException(msg)
  
  
      def assertAlmostEqual(self, first, second, places=None, msg=None, delta=None):
          """Fail if the two objects are unequal as determined by their
             difference rounded to the given number of decimal places
             (default 7) and comparing to zero, or by comparing that the
             between the two objects is more than the given delta.
  
             Note that decimal places (from zero) are usually not the same
             as significant digits (measured from the most signficant digit).
  
             If the two objects compare equal then they will automatically
             compare almost equal.
          """
          if first == second:
              # shortcut
              return
          if delta is not None and places is not None:
              raise TypeError("specify delta or places not both")
  
          if delta is not None:
              if abs(first - second) <= delta:
                  return
  
              standardMsg = '%s != %s within %s delta' % (safe_repr(first),
                                                          safe_repr(second),
                                                          safe_repr(delta))
          else:
              if places is None:
                  places = 7
  
              if round(abs(second-first), places) == 0:
                  return
  
              standardMsg = '%s != %s within %r places' % (safe_repr(first),
                                                            safe_repr(second),
                                                            places)
          msg = self._formatMessage(msg, standardMsg)
          raise self.failureException(msg)
  
      def assertNotAlmostEqual(self, first, second, places=None, msg=None, delta=None):
          """Fail if the two objects are equal as determined by their
             difference rounded to the given number of decimal places
             (default 7) and comparing to zero, or by comparing that the
             between the two objects is less than the given delta.
  
             Note that decimal places (from zero) are usually not the same
             as significant digits (measured from the most signficant digit).
  
             Objects that are equal automatically fail.
          """
          if delta is not None and places is not None:
              raise TypeError("specify delta or places not both")
          if delta is not None:
              if not (first == second) and abs(first - second) > delta:
                  return
              standardMsg = '%s == %s within %s delta' % (safe_repr(first),
                                                          safe_repr(second),
                                                          safe_repr(delta))
          else:
              if places is None:
                  places = 7
              if not (first == second) and round(abs(second-first), places) != 0:
                  return
              standardMsg = '%s == %s within %r places' % (safe_repr(first),
                                                           safe_repr(second),
                                                           places)
  
          msg = self._formatMessage(msg, standardMsg)
          raise self.failureException(msg)
  
      # Synonyms for assertion methods
  
      # The plurals are undocumented.  Keep them that way to discourage use.
      # Do not add more.  Do not remove.
      # Going through a deprecation cycle on these would annoy many people.
      assertEquals = assertEqual
      assertNotEquals = assertNotEqual
      assertAlmostEquals = assertAlmostEqual
      assertNotAlmostEquals = assertNotAlmostEqual
      assert_ = assertTrue
  
      # These fail* assertion method names are pending deprecation and will
      # be a DeprecationWarning in 3.2; http://bugs.python.org/issue2578
      def _deprecate(original_func):
          def deprecated_func(*args, **kwargs):
              warnings.warn(
                  # 'Please use {0} instead.'.format(original_func.__name__),
                  'Please use %s instead.' % (original_func.__name__),
                  PendingDeprecationWarning, 2)
              return original_func(*args, **kwargs)
          return deprecated_func
  
      failUnlessEqual = _deprecate(assertEqual)
      failIfEqual = _deprecate(assertNotEqual)
      failUnlessAlmostEqual = _deprecate(assertAlmostEqual)
      failIfAlmostEqual = _deprecate(assertNotAlmostEqual)
      failUnless = _deprecate(assertTrue)
      failUnlessRaises = _deprecate(assertRaises)
      failIf = _deprecate(assertFalse)
  
      def assertSequenceEqual(self, seq1, seq2, msg=None, seq_type=None):
          """An equality assertion for ordered sequences (like lists and tuples).
  
          For the purposes of this function, a valid ordered sequence type is one
          which can be indexed, has a length, and has an equality operator.
  
          Args:
              seq1: The first sequence to compare.
              seq2: The second sequence to compare.
              seq_type: The expected datatype of the sequences, or None if no
                      datatype should be enforced.
              msg: Optional message to use on failure instead of a list of
                      differences.
          """
          if seq_type is not None:
              seq_type_name = seq_type.__name__
              if not isinstance(seq1, seq_type):
                  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: %s'
                                          % (seq_type_name, safe_repr(seq2)))
          else:
              seq_type_name = "sequence"
  
          differing = None
          try:
              len1 = len(seq1)
          except (TypeError, NotImplementedError):
              differing = 'First %s has no length.    Non-sequence?' % (
                      seq_type_name)
  
          if differing is None:
              try:
                  len2 = len(seq2)
              except (TypeError, NotImplementedError):
                  differing = 'Second %s has no length.    Non-sequence?' % (
                          seq_type_name)
  
          if differing is None:
              if seq1 == seq2:
                  return
  
              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:
                  seq2_repr = seq2_repr[:30] + '...'
              elements = (seq_type_name.capitalize(), seq1_repr, seq2_repr)
              differing = '%ss differ: %s != %s\n' % elements
  
              for i in xrange(min(len1, len2)):
                  try:
                      item1 = seq1[i]
                  except (TypeError, IndexError, NotImplementedError):
                      differing += ('\nUnable to index element %d of first %s\n' %
                                   (i, seq_type_name))
                      break
  
                  try:
                      item2 = seq2[i]
                  except (TypeError, IndexError, NotImplementedError):
                      differing += ('\nUnable to index element %d of second %s\n' %
                                   (i, seq_type_name))
                      break
  
                  if item1 != item2:
                      differing += ('\nFirst differing element %d:\n%s\n%s\n' %
                                   (i, safe_repr(item1), safe_repr(item2)))
                      break
              else:
                  if (len1 == len2 and seq_type is None and
                      type(seq1) != type(seq2)):
                      # The sequences are the same, but have differing types.
                      return
  
              if len1 > len2:
                  differing += ('\nFirst %s contains %d additional '
                               'elements.\n' % (seq_type_name, len1 - len2))
                  try:
                      differing += ('First extra element %d:\n%s\n' %
                                    (len2, safe_repr(seq1[len2])))
                  except (TypeError, IndexError, NotImplementedError):
                      differing += ('Unable to index element %d '
                                    'of first %s\n' % (len2, seq_type_name))
              elif len1 < len2:
                  differing += ('\nSecond %s contains %d additional '
                               'elements.\n' % (seq_type_name, len2 - len1))
                  try:
                      differing += ('First extra element %d:\n%s\n' %
                                    (len1, safe_repr(seq2[len1])))
                  except (TypeError, IndexError, NotImplementedError):
                      differing += ('Unable to index element %d '
                                    'of second %s\n' % (len1, seq_type_name))
          standardMsg = differing
          diffMsg = '\n' + '\n'.join(
              difflib.ndiff(pprint.pformat(seq1).splitlines(),
                            pprint.pformat(seq2).splitlines()))
          standardMsg = self._truncateMessage(standardMsg, diffMsg)
          msg = self._formatMessage(msg, standardMsg)
          self.fail(msg)
  
      def _truncateMessage(self, message, diff):
          max_diff = self.maxDiff
          if max_diff is None or len(diff) <= max_diff:
              return message + diff
          return message + (DIFF_OMITTED % len(diff))
  
      def assertListEqual(self, list1, list2, msg=None):
          """A list-specific equality assertion.
  
          Args:
              list1: The first list to compare.
              list2: The second list to compare.
              msg: Optional message to use on failure instead of a list of
                      differences.
  
          """
          self.assertSequenceEqual(list1, list2, msg, seq_type=list)
  
      def assertTupleEqual(self, tuple1, tuple2, msg=None):
          """A tuple-specific equality assertion.
  
          Args:
              tuple1: The first tuple to compare.
              tuple2: The second tuple to compare.
              msg: Optional message to use on failure instead of a list of
                      differences.
          """
          self.assertSequenceEqual(tuple1, tuple2, msg, seq_type=tuple)
  
      def assertSetEqual(self, set1, set2, msg=None):
          """A set-specific equality assertion.
  
          Args:
              set1: The first set to compare.
              set2: The second set to compare.
              msg: Optional message to use on failure instead of a list of
                      differences.
  
          assertSetEqual uses ducktyping to support different types of sets, and
          is optimized for sets specifically (parameters must support a
          difference method).
          """
          try:
              difference1 = set1.difference(set2)
          except TypeError, e:
              self.fail('invalid type when attempting set difference: %s' % e)
          except AttributeError, e:
              self.fail('first argument does not support set difference: %s' % e)
  
          try:
              difference2 = set2.difference(set1)
          except TypeError, e:
              self.fail('invalid type when attempting set difference: %s' % e)
          except AttributeError, e:
              self.fail('second argument does not support set difference: %s' % e)
  
          if not (difference1 or difference2):
              return
  
          lines = []
          if difference1:
              lines.append('Items in the first set but not the second:')
              for item in difference1:
                  lines.append(repr(item))
          if difference2:
              lines.append('Items in the second set but not the first:')
              for item in difference2:
                  lines.append(repr(item))
  
          standardMsg = '\n'.join(lines)
          self.fail(self._formatMessage(msg, standardMsg))
  
      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 = '%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 = '%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 = '%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: %s' % (safe_repr(expr1),)
              self.fail(self._formatMessage(msg, standardMsg))
  
      def assertDictEqual(self, d1, d2, msg=None):
          self.assertIsInstance(d1, dict, 'First argument is not a dictionary')
          self.assertIsInstance(d2, dict, 'Second argument is not a dictionary')
  
          if d1 != d2:
              standardMsg = '%s != %s' % (safe_repr(d1, True), safe_repr(d2, True))
              diff = ('\n' + '\n'.join(difflib.ndiff(
                             pprint.pformat(d1).splitlines(),
                             pprint.pformat(d2).splitlines())))
              standardMsg = self._truncateMessage(standardMsg, diff)
              self.fail(self._formatMessage(msg, standardMsg))
  
      def assertDictContainsSubset(self, expected, actual, msg=None):
          """Checks whether actual is a superset of expected."""
          missing = []
          mismatched = []
          for key, value in expected.iteritems():
              if key not in actual:
                  missing.append(key)
              elif value != actual[key]:
                  mismatched.append('%s, expected: %s, actual: %s' %
                                    (safe_repr(key), safe_repr(value),
                                     safe_repr(actual[key])))
  
          if not (missing or mismatched):
              return
  
          standardMsg = ''
          if missing:
              standardMsg = 'Missing: %s' % ','.join(safe_repr(m) for m in
                                                      missing)
          if mismatched:
              if standardMsg:
                  standardMsg += '; '
              standardMsg += 'Mismatched values: %s' % ','.join(mismatched)
  
          self.fail(self._formatMessage(msg, standardMsg))
  
      def assertItemsEqual(self, expected_seq, actual_seq, msg=None):
          """An unordered sequence specific comparison. It asserts that
          actual_seq and expected_seq have the same element counts.
          Equivalent to::
  
              self.assertEqual(Counter(iter(actual_seq)),
                               Counter(iter(expected_seq)))
  
          Asserts that each element has the same count in both sequences.
          Example:
              - [0, 1, 1] and [1, 0, 1] compare equal.
              - [0, 0, 1] and [0, 1] compare unequal.
          """
          first_seq, second_seq = list(expected_seq), list(actual_seq)
          with warnings.catch_warnings():
              if sys.py3kwarning:
                  # Silence Py3k warning raised during the sorting
                  for _msg in ["(code|dict|type) inequality comparisons",
                               "builtin_function_or_method order comparisons",
                               "comparing unequal types"]:
                      warnings.filterwarnings("ignore", _msg, DeprecationWarning)
              try:
                  first = collections.Counter(first_seq)
                  second = collections.Counter(second_seq)
              except TypeError:
                  # Handle case with unhashable elements
                  differences = _count_diff_all_purpose(first_seq, second_seq)
              else:
                  if first == second:
                      return
                  differences = _count_diff_hashable(first_seq, second_seq)
  
          if differences:
              standardMsg = 'Element counts were not equal:\n'
              lines = ['First has %d, Second has %d:  %r' % diff for diff in differences]
              diffMsg = '\n'.join(lines)
              standardMsg = self._truncateMessage(standardMsg, diffMsg)
              msg = self._formatMessage(msg, standardMsg)
              self.fail(msg)
  
      def assertMultiLineEqual(self, first, second, msg=None):
          """Assert that two multi-line strings are equal."""
          self.assertIsInstance(first, basestring,
                  'First argument is not a string')
          self.assertIsInstance(second, basestring,
                  'Second argument is not a string')
  
          if first != second:
              # don't use difflib if the strings are too long
              if (len(first) > self._diffThreshold or
                  len(second) > self._diffThreshold):
                  self._baseAssertEqual(first, second, msg)
              firstlines = first.splitlines(True)
              secondlines = second.splitlines(True)
              if len(firstlines) == 1 and first.strip('\r\n') == first:
                  firstlines = [first + '\n']
                  secondlines = [second + '\n']
              standardMsg = '%s != %s' % (safe_repr(first, True),
                                          safe_repr(second, True))
              diff = '\n' + ''.join(difflib.ndiff(firstlines, secondlines))
              standardMsg = self._truncateMessage(standardMsg, diff)
              self.fail(self._formatMessage(msg, standardMsg))
  
      def assertLess(self, a, b, msg=None):
          """Just like self.assertTrue(a < b), but with a nicer default message."""
          if not 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 = '%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 = '%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 = '%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 = '%s is not None' % (safe_repr(obj),)
              self.fail(self._formatMessage(msg, standardMsg))
  
      def assertIsNotNone(self, obj, msg=None):
          """Included for symmetry with assertIsNone."""
          if obj is None:
              standardMsg = 'unexpectedly None'
              self.fail(self._formatMessage(msg, standardMsg))
  
      def assertIsInstance(self, obj, cls, msg=None):
          """Same as self.assertTrue(isinstance(obj, cls)), with a nicer
          default message."""
          if not isinstance(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 = '%s is an instance of %r' % (safe_repr(obj), cls)
              self.fail(self._formatMessage(msg, standardMsg))
  
      def assertRaisesRegexp(self, expected_exception, expected_regexp,
                             callable_obj=None, *args, **kwargs):
          """Asserts that the message in a raised exception matches a regexp.
  
          Args:
              expected_exception: Exception class expected to be raised.
              expected_regexp: Regexp (re pattern object or string) expected
                      to be found in error message.
              callable_obj: Function to be called.
              args: Extra args.
              kwargs: Extra kwargs.
          """
          if expected_regexp is not None:
              expected_regexp = re.compile(expected_regexp)
          context = _AssertRaisesContext(expected_exception, self, expected_regexp)
          if callable_obj is None:
              return context
          with context:
              callable_obj(*args, **kwargs)
  
      def assertRegexpMatches(self, text, expected_regexp, msg=None):
          """Fail the test unless the text matches the regular expression."""
          if isinstance(expected_regexp, basestring):
              expected_regexp = re.compile(expected_regexp)
          if not expected_regexp.search(text):
              msg = msg or "Regexp didn't match"
              msg = '%s: %r not found in %r' % (msg, expected_regexp.pattern, text)
              raise self.failureException(msg)
  
      def assertNotRegexpMatches(self, text, unexpected_regexp, msg=None):
          """Fail the test if the text matches the regular expression."""
          if isinstance(unexpected_regexp, basestring):
              unexpected_regexp = re.compile(unexpected_regexp)
          match = unexpected_regexp.search(text)
          if match:
              msg = msg or "Regexp matched"
              msg = '%s: %r matches %r in %r' % (msg,
                                                 text[match.start():match.end()],
                                                 unexpected_regexp.pattern,
                                                 text)
              raise self.failureException(msg)
  
  
  class FunctionTestCase(TestCase):
      """A test case that wraps a test function.
  
      This is useful for slipping pre-existing test functions into the
      unittest framework. Optionally, set-up and tidy-up functions can be
      supplied. As with TestCase, the tidy-up ('tearDown') function will
      always be called if the set-up ('setUp') function ran successfully.
      """
  
      def __init__(self, testFunc, setUp=None, tearDown=None, description=None):
          super(FunctionTestCase, self).__init__()
          self._setUpFunc = setUp
          self._tearDownFunc = tearDown
          self._testFunc = testFunc
          self._description = description
  
      def setUp(self):
          if self._setUpFunc is not None:
              self._setUpFunc()
  
      def tearDown(self):
          if self._tearDownFunc is not None:
              self._tearDownFunc()
  
      def runTest(self):
          self._testFunc()
  
      def id(self):
          return self._testFunc.__name__
  
      def __eq__(self, other):
          if not isinstance(other, self.__class__):
              return NotImplemented
  
          return self._setUpFunc == other._setUpFunc and \
                 self._tearDownFunc == other._tearDownFunc and \
                 self._testFunc == other._testFunc and \
                 self._description == other._description
  
      def __ne__(self, other):
          return not self == other
  
      def __hash__(self):
          return hash((type(self), self._setUpFunc, self._tearDownFunc,
                       self._testFunc, self._description))
  
      def __str__(self):
          return "%s (%s)" % (strclass(self.__class__),
                              self._testFunc.__name__)
  
      def __repr__(self):
          return "<%s tec=%s>" % (strclass(self.__class__),
                                       self._testFunc)
  
      def shortDescription(self):
          if self._description is not None:
              return self._description
          # doc = self._testFunc.__doc__
          return doc and doc.split("\n")[0].strip() or None
  