MD History: Hook all elements into the page and add tests.

chrome/test/data/webui/md_history/history_toolbar_test.js

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+cr.define('md_history.history_toolbar_test', function() {
+  // Array of test history data.
+  var TEST_HISTORY_RESULTS = [
+    {
+      "dateRelativeDay": "Today - Wednesday, December 9, 2015",
+      "url": "https://www.google.com"
+    }
+  ];
+
+  function registerTests() {
+    suite('history-toolbar', function() {
+      var element;
+      var toolbar;
+
+      suiteSetup(function() {
+        element = $('history-card-manager');
+        toolbar = $('toolbar');
+      });
+
+      test('selecting checkbox causes toolbar to change', function() {
+        element.addNewResults(TEST_HISTORY_RESULTS);
+
+        flush(function() {
+          var item = element.$$('history-card').$$('history-item');
+          MockInteractions.tap(item.$['checkbox']);

[tsergeant, 2016/01/25 00:40:20]

item.$.checkbox here and below again

[hsampson, 2016/01/25 02:14:01]

Done.

+
+          // Ensure that when an item is selected that the count held by the
+          // toolbar increases.
+          assertEquals(1, toolbar.count);
+          // Ensure that the toolbar boolean states that at least one item is
+          // selected.
+          assertTrue(toolbar.itemsSelected_);
+
+          MockInteractions.tap(item.$['checkbox']);
+
+          // Ensure that when an item is deselected the count held by the
+          // toolbar decreases.
+          assertEquals(0, toolbar.count);
+          // Ensure that the toolbar boolean states that no items are selected.
+          assertFalse(toolbar.itemsSelected_);
+        });
+      });
+
+      teardown(function() {
+        toolbar.count = 0;
+      });
+    });
+  }
+  return {
+    registerTests: registerTests
+  };
+});