DIAL extension API skeleton.

chrome/test/data/extensions/api_test/dial/experimental/runtest.js

+// Copyright (c) 2012 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.
+
+// Array of each device list update.
+var devices = [];
+
+function handleOnDeviceList(deviceList) {
+  var newDevices = [];
+  for (var i = 0; i < deviceList.length; ++i) {
+    newDevices.push(deviceList[i]);
+  }
+  devices.push(newDevices);
+}
+chrome.dial.onDeviceList.addListener(handleOnDeviceList);
+
+chrome.test.sendMessage('ready', function(message) {
+  if (message == 'events') {

[Matt Perry, 2012/12/07 23:52:52]

You can split these up into multiple files and use RunExtensionSubtest instead.

[justinlin, 2012/12/11 00:11:29]

Done. One of the tests couldn't use this because it needs some messaging back
and forth, but yea this is a lot nicer.

+    chrome.test.runTests([
+      function testEvents() {
+        // Make sure there were 3 devices.
+        chrome.test.assertEq(3, devices.length);
+
+        // Make sure each update contained 1 more device than the previous.
+        for (var i = 0; i < devices.length; ++i) {
+          chrome.test.assertEq(i + 1, devices[i].length);
+        }
+
+        // Just check the first device in the first update and the last device
+        // in the last update.
+        // Not exposing the device id right now.
+        chrome.test.assertTrue(!('deviceId' in devices[0][0]));
+        chrome.test.assertEq("1", devices[0][0].deviceLabel);
+        chrome.test.assertEq("http://1", devices[0][0].deviceDescriptionUrl);
+
+        chrome.test.assertTrue(!('deviceId' in devices[2][2]));
+        chrome.test.assertEq("3", devices[2][2].deviceLabel);
+        chrome.test.assertEq("http://3", devices[2][2].deviceDescriptionUrl);
+
+        chrome.test.succeed();
+      }
+    ]);
+  } else if (message == 'discovery') {
+    chrome.test.runTests([
+      function testFunctional() {
+        // Remove all listeners first.
+        chrome.dial.onDeviceList.removeListener(handleOnDeviceList);
+
+        var discoverNowShouldSucceed = function(result) {
+          if (result)
+            chrome.test.succeed();
+          else
+            chrome.test.fail();
+        };
+
+        var onDeviceList = function(deviceList) {
+          // Unused.
+        };
+
+        var discoverNowShouldFail = function(result) {
+          if (!result) {
+            chrome.test.succeed();
+            chrome.dial.onDeviceList.addListener(onDeviceList);
+            chrome.dial.discoverNow(discoverNowShouldSucceed);
+          } else {
+            chrome.test.fail();
+          }
+        };
+        chrome.dial.discoverNow(discoverNowShouldFail);
+      }
+    ]);
+  } else {
+    chrome.test.fail();
+  }
+});