text: """Loading unittests."""
  
  import os
  import re
  import sys
  import traceback
  import types
  import unittest
  
  from fnmatch import fnmatch
  
  from django.utils import six
  from django.utils.unittest import case, suite
  
  try:
      from os.path import relpath
  except ImportError:
      from django.utils.unittest.compatibility import relpath
  
  __unittest = True
  
  
  def _CmpToKey(mycmp):
      'Convert a cmp= function into a key= function'
      class K(object):
          def __init__(self, obj):
              self.obj = obj
          def __lt__(self, other):
              return mycmp(self.obj, other.obj) == -1
      return K
  
  
  # what about .pyc or .pyo (etc)
  # we would need to avoid loading the same tests multiple times
  # from '.py', '.pyc' *and* '.pyo'
  VALID_MODULE_NAME = re.compile(r'[_a-z]\w*\.py$', re.IGNORECASE)
  
  
  def _make_failed_import_test(name, suiteClass):
      message = 'Failed to import test module: %s' % name
      if hasattr(traceback, 'format_exc'):
          # Python 2.3 compatibility
          # format_exc returns two frames of discover.py as well
          message += '\n%s' % traceback.format_exc()
      return _make_failed_test('ModuleImportFailure', name, ImportError(message),
                               suiteClass)
  
  def _make_failed_load_tests(name, exception, suiteClass):
      return _make_failed_test('LoadTestsFailure', name, exception, suiteClass)
  
  def _make_failed_test(classname, methodname, exception, suiteClass):
      def testFailure(self):
          raise exception
      attrs = {methodname: testFailure}
      TestClass = type(classname, (case.TestCase,), attrs)
      return suiteClass((TestClass(methodname),))
  
  
  class TestLoader(unittest.TestLoader):
      """
      This class is responsible for loading tests according to various criteria
      and returning them wrapped in a TestSuite
      """
      testMethodPrefix = 'test'
      sortTestMethodsUsing = cmp
      suiteClass = suite.TestSuite
      _top_level_dir = None
  
      def loadTestsFromTestCase(self, testCaseClass):
          """Return a suite of all tests cases contained in testCaseClass"""
          if issubclass(testCaseClass, suite.TestSuite):
              raise TypeError("Test cases should not be derived from TestSuite."
                              " Maybe you meant to derive from TestCase?")
          testCaseNames = self.getTestCaseNames(testCaseClass)
          if not testCaseNames and hasattr(testCaseClass, 'runTest'):
              testCaseNames = ['runTest']
          loaded_suite = self.suiteClass(six.lmap(testCaseClass, testCaseNames))
          return loaded_suite
  
      def loadTestsFromModule(self, module, use_load_tests=True):
          """Return a suite of all tests cases contained in the given module"""
          tests = []
          for name in dir(module):
              obj = getattr(module, name)
              if isinstance(obj, type) and issubclass(obj, unittest.TestCase):
                  tests.append(self.loadTestsFromTestCase(obj))
  
          load_tests = getattr(module, 'load_tests', None)
          tests = self.suiteClass(tests)
          if use_load_tests and load_tests is not None:
              try:
                  return load_tests(self, tests, None)
              except Exception as e:
                  return _make_failed_load_tests(module.__name__, e,
                                                 self.suiteClass)
          return tests
  
      def loadTestsFromName(self, name, module=None):
          """Return a suite of all tests cases given a string specifier.
  
          The name may resolve either to a module, a test case class, a
          test method within a test case class, or a callable object which
          returns a TestCase or TestSuite instance.
  
          The method optionally resolves the names relative to a given module.
          """
          parts = name.split('.')
          if module is None:
              parts_copy = parts[:]
              while parts_copy:
                  try:
                      module = __import__('.'.join(parts_copy))
                      break
                  except ImportError:
                      del parts_copy[-1]
                      if not parts_copy:
                          raise
              parts = parts[1:]
          obj = module
          for part in parts:
              parent, obj = obj, getattr(obj, part)
  
          if isinstance(obj, types.ModuleType):
              return self.loadTestsFromModule(obj)
          elif isinstance(obj, type) and issubclass(obj, unittest.TestCase):
              return self.loadTestsFromTestCase(obj)
          elif (isinstance(obj, types.UnboundMethodType) and
                isinstance(parent, type) and
                issubclass(parent, case.TestCase)):
              return self.suiteClass([parent(obj.__name__)])
          elif isinstance(obj, unittest.TestSuite):
              return obj
          elif hasattr(obj, '__call__'):
              test = obj()
              if isinstance(test, unittest.TestSuite):
                  return test
              elif isinstance(test, unittest.TestCase):
                  return self.suiteClass([test])
              else:
                  raise TypeError("calling %s returned %s, not a test" %
                                  (obj, test))
          else:
              raise TypeError("don't know how to make test from: %s" % obj)
  
      def loadTestsFromNames(self, names, module=None):
          """Return a suite of all tests cases found using the given sequence
          of string specifiers. See 'loadTestsFromName()'.
          """
          suites = [self.loadTestsFromName(name, module) for name in names]
          return self.suiteClass(suites)
  
      def getTestCaseNames(self, testCaseClass):
          """Return a sorted sequence of method names found within testCaseClass
          """
          def isTestMethod(attrname, testCaseClass=testCaseClass,
                           prefix=self.testMethodPrefix):
              return attrname.startswith(prefix) and \
                  hasattr(getattr(testCaseClass, attrname), '__call__')
          testFnNames = six.lfilter(isTestMethod, dir(testCaseClass))
          if self.sortTestMethodsUsing:
              testFnNames.sort(key=_CmpToKey(self.sortTestMethodsUsing))
          return testFnNames
  
      def discover(self, start_dir, pattern='test*.py', top_level_dir=None):
          """Find and return all test modules from the specified start
          directory, recursing into subdirectories to find them. Only test files
          that match the pattern will be loaded. (Using shell style pattern
          matching.)
  
          All test modules must be importable from the top level of the project.
          If the start directory is not the top level directory then the top
          level directory must be specified separately.
  
          If a test package name (directory with '__init__.py') matches the
          pattern then the package will be checked for a 'load_tests' function. If
          this exists then it will be called with loader, tests, pattern.
  
          If load_tests exists then discovery does  *not* recurse into the package,
          load_tests is responsible for loading all tests in the package.
  
          The pattern is deliberately not stored as a loader attribute so that
          packages can continue discovery themselves. top_level_dir is stored so
          load_tests does not need to pass this argument in to loader.discover().
          """
          set_implicit_top = False
          if top_level_dir is None and self._top_level_dir is not None:
              # make top_level_dir optional if called from load_tests in a package
              top_level_dir = self._top_level_dir
          elif top_level_dir is None:
              set_implicit_top = True
              top_level_dir = start_dir
  
          top_level_dir = os.path.abspath(top_level_dir)
  
          if not top_level_dir in sys.path:
              # all test modules must be importable from the top level directory
              # should we *unconditionally* put the start directory in first
              # in sys.path to minimise likelihood of conflicts between installed
              # modules and development versions?
              sys.path.insert(0, top_level_dir)
          self._top_level_dir = top_level_dir
  
          is_not_importable = False
          if os.path.isdir(os.path.abspath(start_dir)):
              start_dir = os.path.abspath(start_dir)
              if start_dir != top_level_dir:
                  is_not_importable = not os.path.isfile(os.path.join(start_dir, '__init__.py'))
          else:
              # support for discovery from dotted module names
              try:
                  __import__(start_dir)
              except ImportError:
                  is_not_importable = True
              else:
                  the_module = sys.modules[start_dir]
                  top_part = start_dir.split('.')[0]
                  start_dir = os.path.abspath(os.path.dirname((the_module.__file__)))
                  if set_implicit_top:
                      self._top_level_dir = os.path.abspath(os.path.dirname(os.path.dirname(sys.modules[top_part].__file__)))
                      sys.path.remove(top_level_dir)
  
          if is_not_importable:
              raise ImportError('Start directory is not importable: %r' % start_dir)
  
          tests = list(self._find_tests(start_dir, pattern))
          return self.suiteClass(tests)
  
      def _get_name_from_path(self, path):
          path = os.path.splitext(os.path.normpath(path))[0]
  
          _relpath = relpath(path, self._top_level_dir)
          assert not os.path.isabs(_relpath), "Path must be within the project"
          assert not _relpath.startswith('..'), "Path must be within the project"
  
          name = _relpath.replace(os.path.sep, '.')
          return name
  
      def _get_module_from_name(self, name):
          __import__(name)
          return sys.modules[name]
  
      def _match_path(self, path, full_path, pattern):
          # override this method to use alternative matching strategy
          return fnmatch(path, pattern)
  
      def _find_tests(self, start_dir, pattern):
          """Used by discovery. Yields test suites it loads."""
          paths = os.listdir(start_dir)
  
          for path in paths:
              full_path = os.path.join(start_dir, path)
              if os.path.isfile(full_path):
                  if not VALID_MODULE_NAME.match(path):
                      # valid Python identifiers only
                      continue
                  if not self._match_path(path, full_path, pattern):
                      continue
                  # if the test file matches, load it
                  name = self._get_name_from_path(full_path)
                  try:
                      module = self._get_module_from_name(name)
                  except:
                      yield _make_failed_import_test(name, self.suiteClass)
                  else:
                      mod_file = os.path.abspath(getattr(module, '__file__', full_path))
                      realpath = os.path.splitext(mod_file)[0]
                      fullpath_noext = os.path.splitext(full_path)[0]
                      if realpath.lower() != fullpath_noext.lower():
                          module_dir = os.path.dirname(realpath)
                          mod_name = os.path.splitext(os.path.basename(full_path))[0]
                          expected_dir = os.path.dirname(full_path)
                          msg = ("%r module incorrectly imported from %r. Expected %r. "
                                 "Is this module globally installed?")
                          raise ImportError(msg % (mod_name, module_dir, expected_dir))
                      yield self.loadTestsFromModule(module)
              elif os.path.isdir(full_path):
                  if not os.path.isfile(os.path.join(full_path, '__init__.py')):
                      continue
  
                  load_tests = None
                  tests = None
                  if fnmatch(path, pattern):
                      # only check load_tests if the package directory itself matches the filter
                      name = self._get_name_from_path(full_path)
                      package = self._get_module_from_name(name)
                      load_tests = getattr(package, 'load_tests', None)
                      tests = self.loadTestsFromModule(package, use_load_tests=False)
  
                  if load_tests is None:
                      if tests is not None:
                          # tests loaded from package file
                          yield tests
                      # recurse into the package
                      for test in self._find_tests(full_path, pattern):
                          yield test
                  else:
                      try:
                          yield load_tests(self, tests, pattern)
                      except Exception as e:
                          yield _make_failed_load_tests(package.__name__, e,
                                                        self.suiteClass)
  
  defaultTestLoader = TestLoader()
  
  
  def _makeLoader(prefix, sortUsing, suiteClass=None):
      loader = TestLoader()
      loader.sortTestMethodsUsing = sortUsing
      loader.testMethodPrefix = prefix
      if suiteClass:
          loader.suiteClass = suiteClass
      return loader
  
  def getTestCaseNames(testCaseClass, prefix, sortUsing=cmp):
      return _makeLoader(prefix, sortUsing).getTestCaseNames(testCaseClass)
  
  def makeSuite(testCaseClass, prefix='test', sortUsing=cmp,
                suiteClass=suite.TestSuite):
      return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromTestCase(testCaseClass)
  
  def findTestCases(module, prefix='test', sortUsing=cmp,
                    suiteClass=suite.TestSuite):
      return _makeLoader(prefix, sortUsing, suiteClass).loadTestsFromModule(module)
  