Add dict_to_form_widget

python_tests/test_form_widget.py

@@ -0,0 +1,40 @@
+from __future__ import annotations
+
+from unittest import TestCase
+
+from optuna_dashboard import ChoiceWidget
+from optuna_dashboard import dict_to_form_widget
+from optuna_dashboard import ObjectiveUserAttrRef
+from optuna_dashboard import SliderWidget
+from optuna_dashboard import TextInputWidget
+
+
+class FormWidgetsTestCase(TestCase):
+    def test_widget_to_dict_from_dict(self) -> None:
+        widgets = [
+            ChoiceWidget(choices=["Good", "Bad"], values=[1, -1]),
+            ChoiceWidget(
+                choices=["Good", "Bad"],
+                values=[1, -1],
+                description="description",
+                user_attr_key="key",
+            ),
+            SliderWidget(min=1, max=5),
+            SliderWidget(
+                min=1,
+                max=5,
+                step=1,
+                labels=[(1, "Bad"), (5, "Good")],
+                description="description",
+                user_attr_key="key",
+            ),
+            TextInputWidget(),
+            TextInputWidget(description="description", user_attr_key="key"),
+            ObjectiveUserAttrRef(key="key"),
+        ]
+
+        for i, widget in enumerate(widgets):
+            with self.subTest(f"{widget.__class__}-{i}"):
+                d = widget.to_dict()
+                restored = dict_to_form_widget(d)
+                assert widget == restored