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diff --git a/devtools/client/responsive.html/test/browser/head.js b/devtools/client/responsive.html/test/browser/head.js
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+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* eslint no-unused-vars: [2, {"vars": "local"}] */
+/* import-globals-from ../../../framework/test/shared-head.js */
+/* import-globals-from ../../../framework/test/shared-redux-head.js */
+/* import-globals-from ../../../commandline/test/helpers.js */
+/* import-globals-from ../../../inspector/test/shared-head.js */
+
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/framework/test/shared-head.js",
+  this);
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/framework/test/shared-redux-head.js",
+  this);
+
+// Import the GCLI test helper
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/commandline/test/helpers.js",
+  this);
+
+// Import helpers registering the test-actor in remote targets
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/shared/test/test-actor-registry.js",
+  this);
+
+// Import helpers for the inspector that are also shared with others
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/devtools/client/inspector/test/shared-head.js",
+  this);
+
+const E10S_MULTI_ENABLED = Services.prefs.getIntPref("dom.ipc.processCount") > 1;
+const TEST_URI_ROOT = "http://example.com/browser/devtools/client/responsive.html/test/browser/";
+const OPEN_DEVICE_MODAL_VALUE = "OPEN_DEVICE_MODAL";
+
+const { _loadPreferredDevices } = require("devtools/client/responsive.html/actions/devices");
+const { getOwnerWindow } = require("sdk/tabs/utils");
+const asyncStorage = require("devtools/shared/async-storage");
+const { addDevice, removeDevice } = require("devtools/client/shared/devices");
+
+SimpleTest.requestCompleteLog();
+SimpleTest.waitForExplicitFinish();
+
+// Toggling the RDM UI involves several docShell swap operations, which are somewhat slow
+// on debug builds. Usually we are just barely over the limit, so a blanket factor of 2
+// should be enough.
+requestLongerTimeout(2);
+
+flags.testing = true;
+Services.prefs.clearUserPref("devtools.responsive.html.displayedDeviceList");
+Services.prefs.setCharPref("devtools.devices.url",
+  TEST_URI_ROOT + "devices.json");
+Services.prefs.setBoolPref("devtools.responsive.html.enabled", true);
+
+registerCleanupFunction(() => {
+  flags.testing = false;
+  Services.prefs.clearUserPref("devtools.devices.url");
+  Services.prefs.clearUserPref("devtools.responsive.html.enabled");
+  Services.prefs.clearUserPref("devtools.responsive.html.displayedDeviceList");
+  asyncStorage.removeItem("devtools.devices.url_cache");
+});
+
+// This depends on the "devtools.responsive.html.enabled" pref
+const { ResponsiveUIManager } = require("resource://devtools/client/responsivedesign/responsivedesign.jsm");
+
+/**
+ * Open responsive design mode for the given tab.
+ */
+var openRDM = Task.async(function* (tab) {
+  info("Opening responsive design mode");
+  let manager = ResponsiveUIManager;
+  let ui = yield manager.openIfNeeded(getOwnerWindow(tab), tab);
+  info("Responsive design mode opened");
+  return { ui, manager };
+});
+
+/**
+ * Close responsive design mode for the given tab.
+ */
+var closeRDM = Task.async(function* (tab, options) {
+  info("Closing responsive design mode");
+  let manager = ResponsiveUIManager;
+  yield manager.closeIfNeeded(getOwnerWindow(tab), tab, options);
+  info("Responsive design mode closed");
+});
+
+/**
+ * Adds a new test task that adds a tab with the given URL, opens responsive
+ * design mode, runs the given generator, closes responsive design mode, and
+ * removes the tab.
+ *
+ * Example usage:
+ *
+ *   addRDMTask(TEST_URL, function*({ ui, manager }) {
+ *     // Your tests go here...
+ *   });
+ */
+function addRDMTask(url, generator) {
+  add_task(function* () {
+    const tab = yield addTab(url);
+    const results = yield openRDM(tab);
+
+    try {
+      yield* generator(results);
+    } catch (err) {
+      ok(false, "Got an error: " + DevToolsUtils.safeErrorString(err));
+    }
+
+    yield closeRDM(tab);
+    yield removeTab(tab);
+  });
+}
+
+function spawnViewportTask(ui, args, task) {
+  return ContentTask.spawn(ui.getViewportBrowser(), args, task);
+}
+
+function waitForFrameLoad(ui, targetURL) {
+  return spawnViewportTask(ui, { targetURL }, function* (args) {
+    if ((content.document.readyState == "complete" ||
+         content.document.readyState == "interactive") &&
+        content.location.href == args.targetURL) {
+      return;
+    }
+    yield ContentTaskUtils.waitForEvent(this, "DOMContentLoaded");
+  });
+}
+
+function waitForViewportResizeTo(ui, width, height) {
+  return new Promise(Task.async(function* (resolve) {
+    let isSizeMatching = (data) => data.width == width && data.height == height;
+
+    // If the viewport has already the expected size, we resolve the promise immediately.
+    let size = yield getContentSize(ui);
+    if (isSizeMatching(size)) {
+      resolve();
+      return;
+    }
+
+    // Otherwise, we'll listen to both content's resize event and browser's load end;
+    // since a racing condition can happen, where the content's listener is added after
+    // the resize, because the content's document was reloaded; therefore the test would
+    // hang forever. See bug 1302879.
+    let browser = ui.getViewportBrowser();
+
+    let onResize = (_, data) => {
+      if (!isSizeMatching(data)) {
+        return;
+      }
+      ui.off("content-resize", onResize);
+      browser.removeEventListener("mozbrowserloadend", onBrowserLoadEnd);
+      info(`Got content-resize to ${width} x ${height}`);
+      resolve();
+    };
+
+    let onBrowserLoadEnd = Task.async(function* () {
+      let data = yield getContentSize(ui);
+      onResize(undefined, data);
+    });
+
+    info(`Waiting for content-resize to ${width} x ${height}`);
+    ui.on("content-resize", onResize);
+    browser.addEventListener("mozbrowserloadend",
+      onBrowserLoadEnd, { once: true });
+  }));
+}
+
+var setViewportSize = Task.async(function* (ui, manager, width, height) {
+  let size = ui.getViewportSize();
+  info(`Current size: ${size.width} x ${size.height}, ` +
+       `set to: ${width} x ${height}`);
+  if (size.width != width || size.height != height) {
+    let resized = waitForViewportResizeTo(ui, width, height);
+    ui.setViewportSize({ width, height });
+    yield resized;
+  }
+});
+
+function getElRect(selector, win) {
+  let el = win.document.querySelector(selector);
+  return el.getBoundingClientRect();
+}
+
+/**
+ * Drag an element identified by 'selector' by [x,y] amount. Returns
+ * the rect of the dragged element as it was before drag.
+ */
+function dragElementBy(selector, x, y, win) {
+  let React = win.require("devtools/client/shared/vendor/react");
+  let { Simulate } = React.addons.TestUtils;
+  let rect = getElRect(selector, win);
+  let startPoint = {
+    clientX: rect.left + Math.floor(rect.width / 2),
+    clientY: rect.top + Math.floor(rect.height / 2),
+  };
+  let endPoint = [ startPoint.clientX + x, startPoint.clientY + y ];
+
+  let elem = win.document.querySelector(selector);
+
+  // mousedown is a React listener, need to use its testing tools to avoid races
+  Simulate.mouseDown(elem, startPoint);
+
+  // mousemove and mouseup are regular DOM listeners
+  EventUtils.synthesizeMouseAtPoint(...endPoint, { type: "mousemove" }, win);
+  EventUtils.synthesizeMouseAtPoint(...endPoint, { type: "mouseup" }, win);
+
+  return rect;
+}
+
+function* testViewportResize(ui, selector, moveBy,
+                             expectedViewportSize, expectedHandleMove) {
+  let win = ui.toolWindow;
+  let resized = waitForViewportResizeTo(ui, ...expectedViewportSize);
+  let startRect = dragElementBy(selector, ...moveBy, win);
+  yield resized;
+
+  let endRect = getElRect(selector, win);
+  is(endRect.left - startRect.left, expectedHandleMove[0],
+    `The x move of ${selector} is as expected`);
+  is(endRect.top - startRect.top, expectedHandleMove[1],
+    `The y move of ${selector} is as expected`);
+}
+
+function openDeviceModal({ toolWindow }) {
+  let { document } = toolWindow;
+  let React = toolWindow.require("devtools/client/shared/vendor/react");
+  let { Simulate } = React.addons.TestUtils;
+  let select = document.querySelector(".viewport-device-selector");
+  let modal = document.querySelector("#device-modal-wrapper");
+
+  info("Checking initial device modal state");
+  ok(modal.classList.contains("closed") && !modal.classList.contains("opened"),
+    "The device modal is closed by default.");
+
+  info("Opening device modal through device selector.");
+  select.value = OPEN_DEVICE_MODAL_VALUE;
+  Simulate.change(select);
+  ok(modal.classList.contains("opened") && !modal.classList.contains("closed"),
+    "The device modal is displayed.");
+}
+
+function changeSelectValue({ toolWindow }, selector, value) {
+  info(`Selecting ${value} in ${selector}.`);
+
+  return new Promise(resolve => {
+    let select = toolWindow.document.querySelector(selector);
+    isnot(select, null, `selector "${selector}" should match an existing element.`);
+
+    let option = [...select.options].find(o => o.value === String(value));
+    isnot(option, undefined, `value "${value}" should match an existing option.`);
+
+    let event = new toolWindow.UIEvent("change", {
+      view: toolWindow,
+      bubbles: true,
+      cancelable: true
+    });
+
+    select.addEventListener("change", () => {
+      is(select.value, value,
+        `Select's option with value "${value}" should be selected.`);
+      resolve();
+    }, { once: true });
+
+    select.value = value;
+    select.dispatchEvent(event);
+  });
+}
+
+const selectDevice = (ui, value) => Promise.all([
+  once(ui, "device-changed"),
+  changeSelectValue(ui, ".viewport-device-selector", value)
+]);
+
+const selectDPR = (ui, value) =>
+  changeSelectValue(ui, "#global-dpr-selector > select", value);
+
+const selectNetworkThrottling = (ui, value) => Promise.all([
+  once(ui, "network-throttling-changed"),
+  changeSelectValue(ui, "#global-network-throttling-selector", value)
+]);
+
+function getSessionHistory(browser) {
+  return ContentTask.spawn(browser, {}, function* () {
+    /* eslint-disable no-undef */
+    let { interfaces: Ci } = Components;
+    let webNav = docShell.QueryInterface(Ci.nsIWebNavigation);
+    let sessionHistory = webNav.sessionHistory;
+    let result = {
+      index: sessionHistory.index,
+      entries: []
+    };
+
+    for (let i = 0; i < sessionHistory.count; i++) {
+      let entry = sessionHistory.getEntryAtIndex(i, false);
+      result.entries.push({
+        uri: entry.URI.spec,
+        title: entry.title
+      });
+    }
+
+    return result;
+    /* eslint-enable no-undef */
+  });
+}
+
+function getContentSize(ui) {
+  return spawnViewportTask(ui, {}, () => ({
+    width: content.screen.width,
+    height: content.screen.height
+  }));
+}
+
+function waitForPageShow(browser) {
+  let mm = browser.messageManager;
+  return new Promise(resolve => {
+    let onShow = message => {
+      if (message.target != browser) {
+        return;
+      }
+      mm.removeMessageListener("PageVisibility:Show", onShow);
+      resolve();
+    };
+    mm.addMessageListener("PageVisibility:Show", onShow);
+  });
+}
+
+function waitForViewportLoad(ui) {
+  return new Promise(resolve => {
+    let browser = ui.getViewportBrowser();
+    browser.addEventListener("mozbrowserloadend", () => {
+      resolve();
+    }, { once: true });
+  });
+}
+
+function load(browser, url) {
+  let loaded = BrowserTestUtils.browserLoaded(browser, false, url);
+  browser.loadURI(url, null, null);
+  return loaded;
+}
+
+function back(browser) {
+  let shown = waitForPageShow(browser);
+  browser.goBack();
+  return shown;
+}
+
+function forward(browser) {
+  let shown = waitForPageShow(browser);
+  browser.goForward();
+  return shown;
+}
+
+function addDeviceForTest(device) {
+  info(`Adding Test Device "${device.name}" to the list.`);
+  addDevice(device);
+
+  registerCleanupFunction(() => {
+    // Note that assertions in cleanup functions are not displayed unless they failed.
+    ok(removeDevice(device), `Removed Test Device "${device.name}" from the list.`);
+  });
+}
+
+function waitForClientClose(ui) {
+  return new Promise(resolve => {
+    info("Waiting for RDM debugger client to close");
+    ui.client.addOneTimeListener("closed", () => {
+      info("RDM's debugger client is now closed");
+      resolve();
+    });
+  });
+}
+
+function* testTouchEventsOverride(ui, expected) {
+  let { document } = ui.toolWindow;
+  let touchButton = document.querySelector("#global-touch-simulation-button");
+
+  let flag = yield ui.emulationFront.getTouchEventsOverride();
+  is(flag === Ci.nsIDocShell.TOUCHEVENTS_OVERRIDE_ENABLED, expected,
+    `Touch events override should be ${expected ? "enabled" : "disabled"}`);
+  is(touchButton.classList.contains("active"), expected,
+    `Touch simulation button should be ${expected ? "" : "in"}active.`);
+}
+
+function testViewportDeviceSelectLabel(ui, expected) {
+  info("Test viewport's device select label");
+
+  let select = ui.toolWindow.document.querySelector(".viewport-device-selector");
+  is(select.selectedOptions[0].textContent, expected,
+     `Device Select value should be: ${expected}`);
+}
+
+function* enableTouchSimulation(ui) {
+  let { document } = ui.toolWindow;
+  let touchButton = document.querySelector("#global-touch-simulation-button");
+  let loaded = waitForViewportLoad(ui);
+  touchButton.click();
+  yield loaded;
+}