refactor: Use temporary YAML file for model settings in test_default_and_override_settings

tests/basic/test_models.py

@@ -91,20 +91,28 @@ class TestModels(unittest.TestCase):
         )  # Check that one of the warnings mentions the bogus model
 
     def test_default_and_override_settings(self):
-        # Add default and override settings to MODEL_SETTINGS
-        MODEL_SETTINGS.extend(
-            [
-                ModelSettings(
-                    name="aider/default",
-                    edit_format="fake",
-                    use_repo_map=True,
-                ),
-                ModelSettings(
-                    name="aider/override",
-                    use_temperature=False,
-                ),
+        import tempfile
+        import yaml
+
+        # Create temporary YAML file with test settings
+        test_settings = [
+            {
+                "name": "aider/default",
+                "edit_format": "fake",
+                "use_repo_map": True,
+            },
+            {
+                "name": "aider/override",
+                "use_temperature": False,
+            }
         ]
-        )
+
+        with tempfile.NamedTemporaryFile(mode='w', suffix='.yml') as tmp:
+            yaml.dump(test_settings, tmp)
+            tmp.flush()
+            
+            # Register the test settings
+            register_models([tmp.name])
 
             # Test that defaults are applied when no exact match
             model = Model("unknown-model")