add test case for test for bug #2653

packages/yew/src/dom_bundle/btag/mod.rs

@@ -931,6 +931,49 @@ mod tests {
             "<div id=\"after\"></div>"
         );
     }
+
+    // test for bug: https://github.com/yewstack/yew/pull/2653
+    #[test]
+    fn test_index_map_attribute_diff() {
+        let (root, scope, parent) = setup_parent();
+
+        let test_ref = NodeRef::default();
+
+        // We want to test appy_diff with Attributes::IndexMap, so we
+        // need to create the VTag manually
+
+        // Create <div disabled="disabled" tabindex="0">
+        let mut vtag = VTag::new("div");
+        vtag.node_ref = test_ref.clone();
+        vtag.add_attribute("disabled", "disabled");
+        vtag.add_attribute("tabindex", "0");
+
+        let elem = VNode::VTag(Box::new(vtag));
+
+        let (_, mut elem) = elem.attach(&root, &scope, &parent, NodeRef::default());
+
+        // Create <div tabindex="0"> (removed first attribute "disabled")
+        let mut vtag = VTag::new("div");
+        vtag.node_ref = test_ref.clone();
+        vtag.add_attribute("tabindex", "0");
+        let next_elem = VNode::VTag(Box::new(vtag));
+        let elem_vtag = assert_vtag(next_elem);
+
+
+        // Sync happens here
+        // this should remove the the "disabled" attribute
+        elem_vtag.reconcile_node(&root, &scope, &parent, NodeRef::default(), &mut elem);
+
+        assert_eq!(
+            test_ref
+                .get()
+                .unwrap()
+                .dyn_ref::<web_sys::Element>()
+                .unwrap()
+                .outer_html(),
+            "<div tabindex=\"0\"></div>"
+        )
+    }
 }
 
 #[cfg(all(test, feature = "wasm_test"))]