gh-116040: [Enum] fix by-value calls when second value is falsey; e.g. Cardinal(1, 0) (GH-116072)

1 files changed, 23 insertions, 0 deletions

diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index 27f8bba..0a44b61 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -3409,6 +3409,15 @@ class TestSpecial(unittest.TestCase):
         self.assertIs(Types(2), Types.NetList)
         self.assertIs(Types('nl'), Types.NetList)
 
+    def test_second_tuple_item_is_falsey(self):
+        class Cardinal(Enum):
+            RIGHT = (1, 0)
+            UP = (0, 1)
+            LEFT = (-1, 0)
+            DOWN = (0, -1)
+        self.assertIs(Cardinal(1, 0), Cardinal.RIGHT)
+        self.assertIs(Cardinal(-1, 0), Cardinal.LEFT)
+
     def test_no_members(self):
         with self.assertRaisesRegex(
                 TypeError,
@@ -3421,6 +3430,20 @@ class TestSpecial(unittest.TestCase):
             ):
             Flag(7)
 
+    def test_empty_names(self):
+        for nothing, e_type in (
+                ('', None),
+                ('', int),
+                ([], None),
+                ([], int),
+                ({}, None),
+                ({}, int),
+            ):
+            empty_enum = Enum('empty_enum', nothing, type=e_type)
+            self.assertEqual(len(empty_enum), 0)
+            self.assertRaises(TypeError, 'has no members', empty_enum, 0)
+
+
 class TestOrder(unittest.TestCase):
     "test usage of the `_order_` attribute"