refactor: migrate some ns.model to BaseModel (#30388)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

api/tests/unit_tests/controllers/common/test_fields.py

@@ -0,0 +1,69 @@
+import builtins
+from types import SimpleNamespace
+from unittest.mock import patch
+
+from flask.views import MethodView as FlaskMethodView
+
+_NEEDS_METHOD_VIEW_CLEANUP = False
+if not hasattr(builtins, "MethodView"):
+    builtins.MethodView = FlaskMethodView
+    _NEEDS_METHOD_VIEW_CLEANUP = True
+from controllers.common.fields import Parameters, Site
+from core.app.app_config.common.parameters_mapping import get_parameters_from_feature_dict
+from models.model import IconType
+
+
+def test_parameters_model_round_trip():
+    parameters = get_parameters_from_feature_dict(features_dict={}, user_input_form=[])
+
+    model = Parameters.model_validate(parameters)
+
+    assert model.model_dump(mode="json") == parameters
+
+
+def test_site_icon_url_uses_signed_url_for_image_icon():
+    site = SimpleNamespace(
+        title="Example",
+        chat_color_theme=None,
+        chat_color_theme_inverted=False,
+        icon_type=IconType.IMAGE,
+        icon="file-id",
+        icon_background=None,
+        description=None,
+        copyright=None,
+        privacy_policy=None,
+        custom_disclaimer=None,
+        default_language="en-US",
+        show_workflow_steps=True,
+        use_icon_as_answer_icon=False,
+    )
+
+    with patch("controllers.common.fields.file_helpers.get_signed_file_url", return_value="signed") as mock_helper:
+        model = Site.model_validate(site)
+
+        assert model.icon_url == "signed"
+        mock_helper.assert_called_once_with("file-id")
+
+
+def test_site_icon_url_is_none_for_non_image_icon():
+    site = SimpleNamespace(
+        title="Example",
+        chat_color_theme=None,
+        chat_color_theme_inverted=False,
+        icon_type=IconType.EMOJI,
+        icon="file-id",
+        icon_background=None,
+        description=None,
+        copyright=None,
+        privacy_policy=None,
+        custom_disclaimer=None,
+        default_language="en-US",
+        show_workflow_steps=True,
+        use_icon_as_answer_icon=False,
+    )
+
+    with patch("controllers.common.fields.file_helpers.get_signed_file_url") as mock_helper:
+        model = Site.model_validate(site)
+
+        assert model.icon_url is None
+        mock_helper.assert_not_called()