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diff --git a/lib/python2.7/unittest/loader.py b/lib/python2.7/unittest/loader.py
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+"""Loading unittests."""
+
+import os
+import re
+import sys
+import traceback
+import types
+
+from functools import cmp_to_key as _CmpToKey
+from fnmatch import fnmatch
+
+from . import case, suite
+
+__unittest = True
+
+# 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\n%s' % (name, 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(object):
+    """
+    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(map(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, case.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, 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, case.TestCase):
+            return self.loadTestsFromTestCase(obj)
+        elif (isinstance(obj, types.UnboundMethodType) and
+              isinstance(parent, type) and
+              issubclass(parent, case.TestCase)):
+            name = parts[-1]
+            inst = parent(name)
+            return self.suiteClass([inst])
+        elif isinstance(obj, suite.TestSuite):
+            return obj
+        elif hasattr(obj, '__call__'):
+            test = obj()
+            if isinstance(test, suite.TestSuite):
+                return test
+            elif isinstance(test, case.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 = filter(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 = self._get_directory_containing_module(top_part)
+                    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_directory_containing_module(self, module_name):
+        module = sys.modules[module_name]
+        full_path = os.path.abspath(module.__file__)
+
+        if os.path.basename(full_path).lower().startswith('__init__.py'):
+            return os.path.dirname(os.path.dirname(full_path))
+        else:
+            # here we have been given a module rather than a package - so
+            # all we can do is search the *same* directory the module is in
+            # should an exception be raised instead
+            return os.path.dirname(full_path)
+
+    def _get_name_from_path(self, path):
+        path = os.path.splitext(os.path.normpath(path))[0]
+
+        _relpath = os.path.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(os.path.realpath(mod_file))[0]
+                    fullpath_noext = os.path.splitext(os.path.realpath(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, 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)