added test for version warning

Author: daniel-sanche

tests/test_version_warnings.py

@@ -0,0 +1,63 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import importlib
+import sys
+import warnings
+from unittest import mock
+
+import pytest
+
+import google.auth
+import google.oauth2
+
+
+@pytest.mark.parametrize("module", [google.auth, google.oauth2])
+@pytest.mark.parametrize(
+    "version, expected_warning",
+    [
+        ((3, 8), True),
+        ((3, 9), True),
+        ((3, 10), False),
+        ((3, 13), False),
+    ],
+)
+def test_python_version_warnings(module, version, expected_warning):
+    # Mock sys.version_info
+    # We use a MagicMock that has major and minor attributes
+    mock_version = mock.Mock()
+    mock_version.major = version[0]
+    mock_version.minor = version[1]
+
+    with mock.patch.object(sys, "version_info", mock_version):
+        with warnings.catch_warnings(record=True) as caught_warnings:
+            warnings.simplefilter("always")
+            importlib.reload(module)
+
+            future_warnings = [
+                w
+                for w in caught_warnings
+                if issubclass(w.category, FutureWarning)
+                and "past its end of life" in str(w.message)
+            ]
+
+            if expected_warning:
+                assert (
+                    len(future_warnings) > 0
+                ), f"Expected FutureWarning for Python {version} in {module.__name__}"
+                assert str(version[1]) in str(future_warnings[0].message)
+            else:
+                assert (
+                    len(future_warnings) == 0
+                ), f"Did not expect FutureWarning for Python {version} in {module.__name__}"