From 746151ecc182d47283f6a04929de99ae690d29ad Mon Sep 17 00:00:00 2001
From: "Maarten A. Breddels" <maartenbreddels@gmail.com>
Date: Mon, 27 Mar 2023 15:19:08 +0200
Subject: [PATCH] test: default serializer for widgets

---
 packages/base/test/src/dummy-manager.ts | 25 +++++++++++++++
 packages/base/test/src/widget_test.ts   | 41 +++++++++++++++++++++++++
 2 files changed, 66 insertions(+)

diff --git a/packages/base/test/src/dummy-manager.ts b/packages/base/test/src/dummy-manager.ts
index db429a64d6..8532ae13a3 100644
--- a/packages/base/test/src/dummy-manager.ts
+++ b/packages/base/test/src/dummy-manager.ts
@@ -133,11 +133,36 @@ class BinaryWidgetView extends TestWidgetView {
   _rendered = 0;
 }
 
+class ContainerWidget extends TestWidget {
+  static serializers = {
+    ...widgets.WidgetModel.serializers,
+    children: { deserialize: widgets.unpack_models },
+  };
+  defaults(): Backbone.ObjectHash {
+    return {
+      ...super.defaults(),
+      _model_name: 'ContainerWidget',
+      _view_name: 'ContainerWidgetView',
+      children: [],
+    };
+  }
+}
+
+class ContainerWidgetView extends TestWidgetView {
+  render(): void {
+    this._rendered += 1;
+  }
+  _rendered = 0;
+}
+
+
 const testWidgets = {
   TestWidget,
   TestWidgetView,
   BinaryWidget,
   BinaryWidgetView,
+  ContainerWidget,
+  ContainerWidgetView,
 };
 
 export class DummyManager implements widgets.IWidgetManager {
diff --git a/packages/base/test/src/widget_test.ts b/packages/base/test/src/widget_test.ts
index b919b95668..a0d717024e 100644
--- a/packages/base/test/src/widget_test.ts
+++ b/packages/base/test/src/widget_test.ts
@@ -71,6 +71,47 @@ describe('unpack_models', function () {
   });
 });
 
+describe('serialize/deserialize', function () {
+  before(async function () {
+    this.manager = new DummyManager();
+    this.widgetChild = await this.manager.new_widget({
+      model_name: 'WidgetModel',
+      model_module: '@jupyter-widgets/base',
+      model_module_version: '1.2.0',
+      view_name: 'WidgetView',
+      view_module: '@jupyter-widgets/base',
+      view_module_version: '1.2.0',
+      model_id: 'widgetChild',
+    });
+
+    this.widgetContainer = await this.manager.new_widget({
+      model_name: 'ContainerWidget',
+      model_module: 'test-widgets',
+      model_module_version: '1.2.0',
+      view_name: 'ContainerWidgetView',
+      view_module: 'test-widgets',
+      view_module_version: '1.2.0',
+      model_id: 'widgetContainer',
+    }, {children:[`IPY_MODEL_${this.widgetChild.model_id}`]});
+  });
+  it('serializes', function () {
+    const state = this.widgetContainer.get_state(false);
+    const serializedState = this.widgetContainer.serialize(state);
+    expect(serializedState).to.deep.equal({
+      "_model_module": 'test-widgets',
+      "_model_module_version": "1.0.0",
+      "_model_name": "ContainerWidget",
+      "_view_count": null,
+      "_view_module": "test-widgets",
+      "_view_module_version": "1.0.0",
+      "_view_name": "ContainerWidgetView"      ,
+      children: ['IPY_MODEL_widgetChild'],
+    });
+  });
+
+});
+
+
 describe('WidgetModel', function () {
   before(async function () {
     this.setup = async function (): Promise<void> {