gh-103746: Test types.UnionType and Literal types together

python · AlexWaygood · Apr 24, 2023 · Apr 24, 2023 · Apr 24, 2023 · bd2f61c0ee3801dfe7a9497b94ea3daee98f90b5
commit bd2f61c0ee3801dfe7a9497b94ea3daee98f90b5
diff --git a/Lib/test/test_types.py b/Lib/test/test_types.py
@@ -925,6 +925,35 @@ def test_or_type_operator_with_SpecialForm(self):
        assert typing.Optional[int] | str == typing.Union[int, str, None]
        assert typing.Union[int, bool] | str == typing.Union[int, bool, str]

+    def test_or_type_operator_with_Literal(self):
+        Literal = typing.Literal
+        self.assertEqual((Literal[1] | Literal[2]).__args__,
+                         (Literal[1], Literal[2]))
+
+        self.assertEqual((Literal[0] | Literal[False]).__args__,
+                         (Literal[0], Literal[False]))
+        self.assertEqual((Literal[1] | Literal[True]).__args__,
+                         (Literal[1], Literal[True]))
+
+        self.assertEqual(Literal[1] | Literal[1], Literal[1])
+        self.assertEqual(Literal['a'] | Literal['a'], Literal['a'])
+
+        import enum
+        class Ints(enum.IntEnum):
+            A = 0
+            B = 1
+
+        self.assertEqual(Literal[Ints.A] | Literal[Ints.A], Literal[Ints.A])
+        self.assertEqual(Literal[Ints.B] | Literal[Ints.B], Literal[Ints.B])
+
+        self.assertEqual((Literal[Ints.B] | Literal[Ints.A]).__args__,
+                         (Literal[Ints.B], Literal[Ints.A]))
+
+        self.assertEqual((Literal[0] | Literal[Ints.A]).__args__,
+                         (Literal[0], Literal[Ints.A]))
+        self.assertEqual((Literal[1] | Literal[Ints.B]).__args__,
+                         (Literal[1], Literal[Ints.B]))
+
    def test_or_type_repr(self):
        assert repr(int | str) == "int | str"
        assert repr((int | str) | list) == "int | str | list"

@@ -1805,6 +1805,11 @@ class Ints(enum.IntEnum):
            A = 0
            B = 1

+        self.assertEqual(Union[Literal[Ints.A], Literal[Ints.A]],
+                         Literal[Ints.A])
+        self.assertEqual(Union[Literal[Ints.B], Literal[Ints.B]],
+                         Literal[Ints.B])
+
        self.assertEqual(Union[Literal[Ints.A], Literal[Ints.B]].__args__,
                         (Literal[Ints.A], Literal[Ints.B]))