[BrowserTest] Add test on boolean widget (#2421)

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browser_tests/assets/widgets/boolean_widget.json

@@ -0,0 +1,35 @@
+{
+  "last_node_id": 11,
+  "last_link_id": 9,
+  "nodes": [
+    {
+      "id": 11,
+      "type": "DevToolsNodeWithBooleanInput",
+      "pos": [
+        0,
+        30
+      ],
+      "size": [
+        315,
+        58
+      ],
+      "flags": {
+        "collapsed": false
+      },
+      "order": 0,
+      "mode": 0,
+      "inputs": [],
+      "outputs": [],
+      "properties": {
+        "Node name for S&R": "DevToolsNodeWithBooleanInput"
+      },
+      "widgets_values": [
+        false
+      ]
+    }
+  ],
+  "links": [],
+  "groups": [],
+  "config": {},
+  "version": 0.4
+}