def load_tests(loader, tests, pattern):
    """Specify which test cases to run."""
    del pattern
    suite = unittest.TestSuite()
    # add all TestCase classes from this (current) module
    for attr in globals().values():
        try:
            if not issubclass(attr, unittest.TestCase):
                continue  # not subclass of TestCase
        except __HOLE__:
            continue  # not a class
        tests = loader.loadTestsFromTestCase(attr)
        suite.addTests(tests)
    # add doctests defined in DOCTEST_MODULES
    for doctest_module in DOCTEST_MODULES:
        suite.addTest(doctest.DocTestSuite(doctest_module))
    return suite
dataset/ETHPy150Open django-ddp/django-ddp/tests/django_todos/tests.py/load_tests