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 4l    """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(o