Revert "bpo-38659: [Enum] add _simple_enum decorator (GH-25285)" (GH-25476)

This reverts commit dbac8f40e81eb0a29dc833e6409a1abf47467da6.
diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index f2340d8..b9d7f96 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -8,7 +8,7 @@
 import threading
 from collections import OrderedDict
 from enum import Enum, IntEnum, StrEnum, EnumType, Flag, IntFlag, unique, auto
-from enum import STRICT, CONFORM, EJECT, KEEP, _simple_enum, _test_simple_enum
+from enum import STRICT, CONFORM, EJECT, KEEP
 from io import StringIO
 from pickle import dumps, loads, PicklingError, HIGHEST_PROTOCOL
 from test import support
@@ -2511,13 +2511,10 @@ class Bizarre(Flag, boundary=KEEP):
             d = 6
         #
         self.assertRaisesRegex(ValueError, 'invalid value: 7', Iron, 7)
-        #
         self.assertIs(Water(7), Water.ONE|Water.TWO)
         self.assertIs(Water(~9), Water.TWO)
-        #
         self.assertEqual(Space(7), 7)
         self.assertTrue(type(Space(7)) is int)
-        #
         self.assertEqual(list(Bizarre), [Bizarre.c])
         self.assertIs(Bizarre(3), Bizarre.b)
         self.assertIs(Bizarre(6), Bizarre.d)
@@ -3056,20 +3053,16 @@ class Space(IntFlag, boundary=EJECT):
             EIGHT = 8
         self.assertIs(Space._boundary_, EJECT)
         #
-        #
         class Bizarre(IntFlag, boundary=KEEP):
             b = 3
             c = 4
             d = 6
         #
         self.assertRaisesRegex(ValueError, 'invalid value: 5', Iron, 5)
-        #
         self.assertIs(Water(7), Water.ONE|Water.TWO)
         self.assertIs(Water(~9), Water.TWO)
-        #
         self.assertEqual(Space(7), 7)
         self.assertTrue(type(Space(7)) is int)
-        #
         self.assertEqual(list(Bizarre), [Bizarre.c])
         self.assertIs(Bizarre(3), Bizarre.b)
         self.assertIs(Bizarre(6), Bizarre.d)
@@ -3584,41 +3577,6 @@ def test_inspect_classify_class_attrs(self):
         if failed:
             self.fail("result does not equal expected, see print above")
 
-    def test_test_simple_enum(self):
-        @_simple_enum(Enum)
-        class SimpleColor:
-            RED = 1
-            GREEN = 2
-            BLUE = 3
-        class CheckedColor(Enum):
-            RED = 1
-            GREEN = 2
-            BLUE = 3
-        self.assertTrue(_test_simple_enum(CheckedColor, SimpleColor) is None)
-        SimpleColor.GREEN._value_ = 9
-        self.assertRaisesRegex(
-                TypeError, "enum mismatch",
-                _test_simple_enum, CheckedColor, SimpleColor,
-                )
-        class CheckedMissing(IntFlag, boundary=KEEP):
-            SIXTY_FOUR = 64
-            ONE_TWENTY_EIGHT = 128
-            TWENTY_FORTY_EIGHT = 2048
-            ALL = 2048 + 128 + 64 + 12
-        CM = CheckedMissing
-        self.assertEqual(list(CheckedMissing), [CM.SIXTY_FOUR, CM.ONE_TWENTY_EIGHT, CM.TWENTY_FORTY_EIGHT])
-        #
-        @_simple_enum(IntFlag, boundary=KEEP)
-        class Missing:
-            SIXTY_FOUR = 64
-            ONE_TWENTY_EIGHT = 128
-            TWENTY_FORTY_EIGHT = 2048
-            ALL = 2048 + 128 + 64 + 12
-        M = Missing
-        self.assertEqual(list(CheckedMissing), [M.SIXTY_FOUR, M.ONE_TWENTY_EIGHT, M.TWENTY_FORTY_EIGHT])
-        #
-        _test_simple_enum(CheckedMissing, Missing)
-        
 
 class MiscTestCase(unittest.TestCase):
     def test__all__(self):
@@ -3634,13 +3592,6 @@ def test__all__(self):
 CONVERT_TEST_NAME_E = 5
 CONVERT_TEST_NAME_F = 5
 
-CONVERT_STRING_TEST_NAME_D = 5
-CONVERT_STRING_TEST_NAME_C = 5
-CONVERT_STRING_TEST_NAME_B = 5
-CONVERT_STRING_TEST_NAME_A = 5  # This one should sort first.
-CONVERT_STRING_TEST_NAME_E = 5
-CONVERT_STRING_TEST_NAME_F = 5
-
 class TestIntEnumConvert(unittest.TestCase):
     def test_convert_value_lookup_priority(self):
         test_type = enum.IntEnum._convert_(
@@ -3688,16 +3639,14 @@ def test_convert_raise(self):
                 filter=lambda x: x.startswith('CONVERT_TEST_'))
 
     def test_convert_repr_and_str(self):
-        # reset global constants, as previous tests could have converted the 
-        # integer values to enums
         module = ('test.test_enum', '__main__')[__name__=='__main__']
         test_type = enum.IntEnum._convert_(
                 'UnittestConvert',
                 module,
-                filter=lambda x: x.startswith('CONVERT_STRING_TEST_'))
-        self.assertEqual(repr(test_type.CONVERT_STRING_TEST_NAME_A), '%s.CONVERT_STRING_TEST_NAME_A' % module)
-        self.assertEqual(str(test_type.CONVERT_STRING_TEST_NAME_A), 'CONVERT_STRING_TEST_NAME_A')
-        self.assertEqual(format(test_type.CONVERT_STRING_TEST_NAME_A), '5')
+                filter=lambda x: x.startswith('CONVERT_TEST_'))
+        self.assertEqual(repr(test_type.CONVERT_TEST_NAME_A), '%s.CONVERT_TEST_NAME_A' % module)
+        self.assertEqual(str(test_type.CONVERT_TEST_NAME_A), 'CONVERT_TEST_NAME_A')
+        self.assertEqual(format(test_type.CONVERT_TEST_NAME_A), '5')
 
 # global names for StrEnum._convert_ test
 CONVERT_STR_TEST_2 = 'goodbye'