🔧 Skip tests for discriminator param (needs Python 3.8+)

tests/test_pydantic/test_field.py

@@ -2,8 +2,9 @@
 Tests to ensure that the SQLModel `Field` constructor works as
 expected from the Pydantic `Field` function.
 """
+import sys
 from decimal import Decimal
-from typing import List, Literal, Optional, Union
+from typing import List, Optional, Union
 
 import pytest
 from pydantic import ValidationError
@@ -35,9 +36,15 @@ class Model(SQLModel):
         Model(unique_strings=["x", "y", "x"])
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 8), reason="requires Python 3.8+ (for `typing.Literal`)"
+)
 def test_discriminator():
+    from typing import Literal
+
     # Example adapted from
     # [Pydantic docs](https://pydantic-docs.helpmanual.io/usage/types/#discriminated-unions-aka-tagged-unions):
+
     class Cat(SQLModel):
         pet_type: Literal["cat"]
         meows: int