🔧 Add unit tests to cover handling of obsolete sa_column-parameters

tests/test_sa_column.py

@@ -0,0 +1,33 @@
+"""These test cases should become obsolete once `sa_column`-parameters are dropped from `Field`."""
+
+import pytest
+from pydantic.config import BaseConfig
+from pydantic.fields import ModelField
+from sqlalchemy.sql.schema import CheckConstraint, Column, ForeignKey
+from sqlmodel.main import Field, FieldInfo, get_column_from_field
+
+
+def test_sa_column_params_raise_warnings():
+    with pytest.warns(DeprecationWarning):
+        Field(sa_column=Column())
+    with pytest.warns(DeprecationWarning):
+        Field(sa_column_args=[ForeignKey("foo.id"), CheckConstraint(">1")])
+    with pytest.warns(DeprecationWarning):
+        Field(sa_column_kwargs={"name": "foo"})
+
+
+def test_sa_column_overrides_other_params():
+    col = Column()
+    field = ModelField(
+        name="foo",
+        type_=str,
+        class_validators=None,
+        model_config=BaseConfig,
+        field_info=FieldInfo(
+            index=True,  # should be ignored
+            sa_column=col,
+        ),
+    )
+    output = get_column_from_field(field)
+    assert output is col
+    assert output.index is None