diff --git a/Lib/test/test_configparser.py b/Lib/test/test_configparser.py
index 57e9df1..fc56550 100644
--- a/Lib/test/test_configparser.py
+++ b/Lib/test/test_configparser.py
@@ -32,7 +32,7 @@
     __iter__ = iterkeys
 
 
-class CfgParserTestCaseClass(unittest.TestCase):
+class CfgParserTestCaseClass:
     allow_no_value = False
     delimiters = ('=', ':')
     comment_prefixes = (';', '#')
@@ -830,12 +830,12 @@
         self.assertEqual(cf.sections(), ['section1', 'section2', 'section3'])
 
 
-class StrictTestCase(BasicTestCase):
+class StrictTestCase(BasicTestCase, unittest.TestCase):
     config_class = configparser.RawConfigParser
     strict = True
 
 
-class ConfigParserTestCase(BasicTestCase):
+class ConfigParserTestCase(BasicTestCase, unittest.TestCase):
     config_class = configparser.ConfigParser
 
     def test_interpolation(self):
@@ -924,7 +924,7 @@
         self.assertRaises(ValueError, cf.add_section, self.default_section)
 
 
-class ConfigParserTestCaseNoInterpolation(BasicTestCase):
+class ConfigParserTestCaseNoInterpolation(BasicTestCase, unittest.TestCase):
     config_class = configparser.ConfigParser
     interpolation = None
     ini = textwrap.dedent("""
@@ -989,7 +989,7 @@
 class ConfigParserTestCaseNonStandardDefaultSection(ConfigParserTestCase):
     default_section = 'general'
 
-class MultilineValuesTestCase(BasicTestCase):
+class MultilineValuesTestCase(BasicTestCase, unittest.TestCase):
     config_class = configparser.ConfigParser
     wonderful_spam = ("I'm having spam spam spam spam "
                       "spam spam spam beaked beans spam "
@@ -1017,7 +1017,7 @@
         self.assertEqual(cf_from_file.get('section8', 'lovely_spam4'),
                          self.wonderful_spam.replace('\t\n', '\n'))
 
-class RawConfigParserTestCase(BasicTestCase):
+class RawConfigParserTestCase(BasicTestCase, unittest.TestCase):
     config_class = configparser.RawConfigParser
 
     def test_interpolation(self):
@@ -1064,7 +1064,7 @@
     comment_prefixes = ('//', '"')
     inline_comment_prefixes = ('//', '"')
 
-class RawConfigParserTestSambaConf(CfgParserTestCaseClass):
+class RawConfigParserTestSambaConf(CfgParserTestCaseClass, unittest.TestCase):
     config_class = configparser.RawConfigParser
     comment_prefixes = ('#', ';', '----')
     inline_comment_prefixes = ('//',)
@@ -1084,7 +1084,7 @@
         self.assertEqual(cf.get("global", "hosts allow"), "127.")
         self.assertEqual(cf.get("tmp", "echo command"), "cat %s; rm %s")
 
-class ConfigParserTestCaseExtendedInterpolation(BasicTestCase):
+class ConfigParserTestCaseExtendedInterpolation(BasicTestCase, unittest.TestCase):
     config_class = configparser.ConfigParser
     interpolation = configparser.ExtendedInterpolation()
     default_section = 'common'
@@ -1258,7 +1258,7 @@
 class ConfigParserTestCaseNoValue(ConfigParserTestCase):
     allow_no_value = True
 
-class ConfigParserTestCaseTrickyFile(CfgParserTestCaseClass):
+class ConfigParserTestCaseTrickyFile(CfgParserTestCaseClass, unittest.TestCase):
     config_class = configparser.ConfigParser
     delimiters = {'='}
     comment_prefixes = {'#'}
@@ -1355,7 +1355,7 @@
                          "o4 = 1\n\n")
 
 
-class CompatibleTestCase(CfgParserTestCaseClass):
+class CompatibleTestCase(CfgParserTestCaseClass, unittest.TestCase):
     config_class = configparser.RawConfigParser
     comment_prefixes = '#;'
     inline_comment_prefixes = ';'
@@ -1377,7 +1377,7 @@
         self.assertEqual(cf.get('Commented Bar', 'quirk'),
                          'this;is not a comment')
 
-class CopyTestCase(BasicTestCase):
+class CopyTestCase(BasicTestCase, unittest.TestCase):
     config_class = configparser.ConfigParser
 
     def fromstring(self, string, defaults=None):
@@ -1713,27 +1713,5 @@
         self.assertEqual(s['k3'], 'v3;#//still v3# and still v3')
 
 
-def test_main():
-    support.run_unittest(
-        ConfigParserTestCase,
-        ConfigParserTestCaseNonStandardDelimiters,
-        ConfigParserTestCaseNoValue,
-        ConfigParserTestCaseExtendedInterpolation,
-        ConfigParserTestCaseLegacyInterpolation,
-        ConfigParserTestCaseNoInterpolation,
-        ConfigParserTestCaseTrickyFile,
-        MultilineValuesTestCase,
-        RawConfigParserTestCase,
-        RawConfigParserTestCaseNonStandardDelimiters,
-        RawConfigParserTestSambaConf,
-        SortedTestCase,
-        Issue7005TestCase,
-        StrictTestCase,
-        CompatibleTestCase,
-        CopyTestCase,
-        ConfigParserTestCaseNonStandardDefaultSection,
-        ReadFileTestCase,
-        CoverageOneHundredTestCase,
-        ExceptionPicklingTestCase,
-        InlineCommentStrippingTestCase,
-        )
+if __name__ == '__main__':
+    unittest.main()