web UI added and refactoring done

python_app/tests/test_gui_profile_codec.py

@@ -30,6 +30,42 @@ class GuiProfileCodecTest(unittest.TestCase):
         self.assertEqual(decoded.gui.processing.pass_through.combo_filter, "0:0,1:0")
         self.assertEqual(encoded["gui"]["processing"]["pass_through"]["combo_filter"], "0:0,1:0")
 
+    def test_default_profile_round_trips_idempotently(self) -> None:
+        # Full-subtree idempotence catches field-drop/mis-map regressions across every
+        # sub-model, which the single combo_filter round-trip above cannot.
+        once = GuiProfileModel().to_dict()
+        twice = GuiProfileModel.from_dict(once).to_dict()
+        self.assertEqual(once["gui"], twice["gui"])
+
+    def test_missing_gui_section_yields_none(self) -> None:
+        self.assertIsNone(GuiProfileModel.from_dict({}).gui)
+
+    def test_unsupported_version_is_rejected(self) -> None:
+        with self.assertRaisesRegex(ValueError, "version"):
+            GuiProfileModel.from_dict({"gui": {"version": 2}})
+
+    def test_invalid_combo_mode_is_rejected(self) -> None:
+        with self.assertRaisesRegex(ValueError, "combo_mode"):
+            GuiProfileModel.from_dict({"gui": {"switches": {"combo_mode": "bogus"}}})
+
+    def test_wrong_typed_field_is_rejected(self) -> None:
+        with self.assertRaises(ValueError):  # combos_text must be a JSON string, not a number
+            GuiProfileModel.from_dict({"gui": {"switches": {"combos_text": 123}}})
+
+    def test_legacy_gpr_payload_migrates_selected_mode(self) -> None:
+        # An old payload that selects 'gpr' but carries a legacy root gpr.mode is migrated.
+        decoded = GuiProfileModel.from_dict({
+            "gui": {"processing": {"selected_mode": "gpr"}},
+            "gpr": {"relative_permittivity": 4.0, "mode": "point"},
+        })
+        assert decoded.gui is not None
+        self.assertEqual(decoded.gui.processing.selected_mode, "legacy_gpr")
+
+    def test_modern_gpr_selection_is_not_migrated(self) -> None:
+        decoded = GuiProfileModel.from_dict({"gui": {"processing": {"selected_mode": "gpr"}}})
+        assert decoded.gui is not None
+        self.assertEqual(decoded.gui.processing.selected_mode, "gpr")
+
 
 if __name__ == "__main__":
     unittest.main()