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third_party/polymer/components/iron-menu-behavior/test/iron-menu-behavior.html

Index: third_party/polymer/components/iron-menu-behavior/test/iron-menu-behavior.html
diff --git a/third_party/polymer/components/iron-menu-behavior/test/iron-menu-behavior.html b/third_party/polymer/components/iron-menu-behavior/test/iron-menu-behavior.html
index 3b6b2910384dd4872c08eb2c58db0bd7e28f3776..e0e50ed04736d861d34df1050e6539f37367af73 100644
--- a/third_party/polymer/components/iron-menu-behavior/test/iron-menu-behavior.html
+++ b/third_party/polymer/components/iron-menu-behavior/test/iron-menu-behavior.html
@@ -338,6 +338,47 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
             done();
           });
         });
+
+        test('`tabIndex` properties of all items are updated when items change', function(done) {
+          var menu = fixture('basic');
+
+          function assertTabIndexCounts(nodes, expected) {
+            var tabIndexCounts = {};
+            for (var i = 0; i < nodes.length; i++) {
+              var tabIndex = nodes[i].tabIndex;
+              if (tabIndexCounts[tabIndex]) {
+                tabIndexCounts[tabIndex]++;
+              } else {
+                tabIndexCounts[tabIndex] = 1;
+              }
+            }
+
+            assert.equal(Object.keys(tabIndexCounts).length, Object.keys(expected).length);
+            Object.keys(expected).forEach(function(key) {
+              assert.equal(tabIndexCounts[key], expected[key]);
+            });
+          }
+
+          function divWithTabIndex(tabIndex) {
+            var div = document.createElement('div');
+            div.tabIndex = tabIndex;
+            return div;
+          }
+
+          // Only the selected item will have tabIndex 0.
+          menu.select(0);
+          assertTabIndexCounts(menu.items, {"-1": 2, "0": 1});
+
+          Polymer.dom(menu).appendChild(divWithTabIndex(1));
+          Polymer.dom(menu).appendChild(divWithTabIndex(2));
+          Polymer.dom(menu).appendChild(divWithTabIndex(3));
+
+          // Async wait for `observeNodes`.
+          Polymer.Base.async(function() {
+            assertTabIndexCounts(menu.items, {"-1": 5, "0": 1});
+            done();
+          });
+        });
       });
     </script>
   </body>