diff -r 000000000000 -r 6474c204b198 browser/metro/base/tests/mochitest/helpers/HistoryHelper.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/metro/base/tests/mochitest/helpers/HistoryHelper.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,94 @@
+// -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+var HistoryTestHelper = {
+  _originalNavHistoryService: null,
+  _startView:  null,
+  MockNavHistoryService: {
+    getNewQueryOptions: function () {
+      return {};
+    },
+    getNewQuery: function () {
+      return {
+        setFolders: function(){}
+      };
+    },
+    executeQuery: function () {
+      return {
+        root: {
+          get childCount() {
+            return Object.keys(HistoryTestHelper._nodes).length;
+          },
+
+          getChild: function (aIndex) HistoryTestHelper._nodes[Object.keys(HistoryTestHelper._nodes)[aIndex]]
+        }
+      }
+    }
+  },
+
+  _originalHistoryService: null,
+  MockHistoryService: {
+    removePage: function (aURI) {
+      delete HistoryTestHelper._nodes[aURI.spec];
+
+      // Simulate observer notification
+      HistoryTestHelper._startView.onDeleteURI(aURI);
+    },
+  },
+
+  Node: function (aTitle, aURISpec) {
+    this.title = aTitle;
+    this.uri = aURISpec;
+    this.pinned = true
+  },
+
+  _nodes: null,
+  createNodes: function (aMany) {
+    this._nodes = {};
+    for (let i=0; i<aMany; i++) {
+      let title = "mock-history-" + i;
+      let uri = "http://" + title + ".com.br/";
+
+      this._nodes[uri] = new this.Node(title, uri);
+    }
+  },
+
+  _originalPinHelper: null,
+  MockPinHelper: {
+    isPinned: function (aItem) HistoryTestHelper._nodes[aItem].pinned,
+    setUnpinned: function (aItem) HistoryTestHelper._nodes[aItem].pinned = false,
+    setPinned: function (aItem) HistoryTestHelper._nodes[aItem].pinned = true,
+  },
+
+  setup: function setup() {
+    this._startView = Browser.selectedBrowser.contentWindow.HistoryStartView._view;
+
+    // Just enough items so that there will be one less then the limit
+    // after removing 4 items.
+    this.createNodes(this._startView.maxTiles + 3);
+
+    this._originalNavHistoryService = this._startView._navHistoryService;
+    this._startView._navHistoryService = this.MockNavHistoryService;
+
+    this._originalHistoryService = this._startView._historyService;
+    this._startView._historyService= this.MockHistoryService;
+
+    this._originalPinHelper = this._startView._pinHelper;
+    this._startView._pinHelper = this.MockPinHelper;
+
+    this._startView._set.clearAll();
+    this._startView.populateGrid();
+  },
+
+  restore: function () {
+    this._startView._navHistoryService = this._originalNavHistoryService;
+    this._startView._historyService= this._originalHistoryService;
+    this._startView._pinHelper = this._originalPinHelper;
+
+    this._startView._set.clearAll();
+    this._startView.populateGrid();
+  }
+};