MD History: Refactored design for displaying history information

chrome/test/data/webui/md_history/history_item_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_item_test', function() {
+  var TEST_HISTORY_RESULTS = [
+    {"time": "1000000000"},
+    {"time": "10000000"},
+    {"time": "900000"},
+    {"time": "899999"}
+  ];
+
+  function registerTests() {
+    suite('history-item', function() {
+      var element;
+
+      suiteSetup(function() {
+        element = $('history-list');
+      });
+
+      test('basic separator insertion', function() {
+        element.addNewResults(TEST_HISTORY_RESULTS);
+
+        flush(function() {
+          // Check that the correct number of time gaps are inserted.
+          var spacers =
+              Polymer.dom(element.root).querySelectorAll('#time-gap-separator');
+          assertEquals(2, spacers.length);
+
+          var items = Polymer.dom(element.root)
+              .querySelectorAll('history-item');
+          assertTrue(items[0].hasTimeGap);
+          assertTrue(items[1].hasTimeGap);
+          assertFalse(items[2].hasTimeGap);
+        });
+      });
+
+      teardown(function() {
+        element.historyDataByDay_ = [];
+      });
+    });
+  }
+  return {
+    registerTests: registerTests
+  };
+});