gh-94601: [Enum] fix inheritance for __str__ and friends (GH-94942)

(cherry picked from commit c961d14f85a0e3e53d5ad1182206ef34030f10b8)

Co-authored-by: Ethan Furman <ethan@stoneleaf.us>

1 files changed, 21 insertions, 5 deletions

diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index 74f31be..80834f2 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -2658,12 +2658,15 @@ class TestSpecial(unittest.TestCase):
         @dataclass
         class Foo:
             __qualname__ = 'Foo'
-            a: int = 0
+            a: int
         class Entries(Foo, Enum):
-            ENTRY1 = Foo(1)
+            ENTRY1 = 1
+        self.assertTrue(isinstance(Entries.ENTRY1, Foo))
+        self.assertTrue(Entries._member_type_ is Foo, Entries._member_type_)
+        self.assertTrue(Entries.ENTRY1.value == Foo(1), Entries.ENTRY1.value)
         self.assertEqual(repr(Entries.ENTRY1), '<Entries.ENTRY1: Foo(a=1)>')
 
-    def test_repr_with_non_data_type_mixin(self):
+    def test_repr_with_init_data_type_mixin(self):
         # non-data_type is a mixin that doesn't define __new__
         class Foo:
             def __init__(self, a):
@@ -2671,10 +2674,23 @@ class TestSpecial(unittest.TestCase):
             def __repr__(self):
                 return f'Foo(a={self.a!r})'
         class Entries(Foo, Enum):
-            ENTRY1 = Foo(1)
-
+            ENTRY1 = 1
+        #
         self.assertEqual(repr(Entries.ENTRY1), '<Entries.ENTRY1: Foo(a=1)>')
 
+    def test_repr_and_str_with_non_data_type_mixin(self):
+        # non-data_type is a mixin that doesn't define __new__
+        class Foo:
+            def __repr__(self):
+                return 'Foo'
+            def __str__(self):
+                return 'ooF'
+        class Entries(Foo, Enum):
+            ENTRY1 = 1
+        #
+        self.assertEqual(repr(Entries.ENTRY1), 'Foo')
+        self.assertEqual(str(Entries.ENTRY1), 'ooF')
+
     def test_value_backup_assign(self):
         # check that enum will add missing values when custom __new__ does not
         class Some(Enum):