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Google Testing Blog: August 2014
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var a = axel * 10000000000000; document.write('<iframe src="https://2542116.fls.doubleclick.net/activityi;src=2542116;type=gblog;cat=googl0;ord=ord=' + a + '?" width="1" height="1" frameborder="0" style="display:none"></iframe>'); //]]> </script> <noscript> <img alt='' height='1' src='https://ad.doubleclick.net/ddm/activity/src=2542116;type=gblog;cat=googl0;ord=1?' width='1'/> </noscript> <!-- Header --> <div class='header-outer'> <div class='header-inner'> <div class='section' id='header'><div class='widget Header' data-version='1' id='Header1'> <div class='header-left'> <div class='header-title'> <a class='google-logo' href='https://testing.googleblog.com/'> <img height='50' src='https://www.gstatic.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png'/> </a> <a href='/.'> <h2> Testing Blog </h2> </a> </div> <div class='header-desc'> </div> </div> </div></div> </div> </div> <!-- all content wrapper start --> <div class='cols-wrapper loading'> <div class='col-main-wrapper'> <div class='col-main'> <div class='section' id='main'><div class='widget Blog' data-version='1' id='Blog1'> <div class='post' data-id='2586091485190798502' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2014/08/chrome-firefox-webrtc-interop-test-pt-1.html' itemprop='url' title='Chrome - Firefox WebRTC Interop Test - Pt 1'> Chrome - Firefox WebRTC Interop Test - Pt 1 </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Tuesday, August 26, 2014 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> <i>by Patrik Höglund </i><br /> <br /> <a href="http://www.webrtc.org/">WebRTC</a> enables real time peer-to-peer video and voice transfer in the browser, making it possible to build, among other things, a <a href="https://apprtc.appspot.com/">working video chat</a> with a <a href="https://github.com/GoogleChrome/webrtc/tree/master/samples/web/content/apprtc">small amount of Python and JavaScript</a>. As a web standard, it has several unusual properties which makes it hard to test. A regular web standard generally accepts HTML text and yields a bitmap as output (what you see in the browser). For WebRTC, we have real-time RTP media streams on one side being sent to another WebRTC-enabled endpoint. These RTP packets have been jumping across NAT, through firewalls and perhaps through TURN servers to deliver hopefully stutter-free and low latency media. <br /> <br /> WebRTC is probably the only web standard in which we need to test direct communication between Chrome and other browsers. Remember, WebRTC builds on peer-to-peer technology, which means we talk directly between browsers rather than through a server. Chrome, Firefox and Opera have announced support for WebRTC so far. To test interoperability, we set out to build an automated test to ensure that Chrome and Firefox can get a call up. This article describes how we implemented such a test and the tradeoffs we made along the way.<br /> <br /> <h3> Calling in WebRTC </h3> Setting up a WebRTC call requires passing SDP blobs over a signaling connection. These blobs contain information on the capabilities of the endpoint, such as what media formats it supports and what preferences it has (for instance, perhaps the endpoint has VP8 decoding hardware, which means the endpoint will handle VP8 more efficiently than, say, H.264). By sending these blobs the endpoints can agree on what media format they will be sending between themselves and how to traverse the network between them. Once that is done, the browsers will talk directly to each other, and nothing gets sent over the signaling connection.<br /> <br /> <div class="separator" style="clear: both; text-align: center;"> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPSI18tUi-P0U03LzJcP6bbk8PSB-5fXLi-HSPGJ-1zexNRpVxKREigxle-R8eAQLxxzAflu-LF5XLVZyFBjFD7u93CVnO7pDKTfZq_xU9DuiVIRhbsluyq-L9WMzIghB1R_bX/s1600/image00.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPSI18tUi-P0U03LzJcP6bbk8PSB-5fXLi-HSPGJ-1zexNRpVxKREigxle-R8eAQLxxzAflu-LF5XLVZyFBjFD7u93CVnO7pDKTfZq_xU9DuiVIRhbsluyq-L9WMzIghB1R_bX/s1600/image00.png" width="500" /></a></div> <div style="text-align: center;"> <i>Figure 1. Signaling and media connections.</i></div> <br /> How these blobs are sent is up to the application. Usually the browsers connect to some server which mediates the connection between the browsers, for instance by using a contact list or a room number. The <a href="https://apprtc.appspot.com/">AppRTC reference application</a> uses room numbers to pair up browsers and sends the SDP blobs from the browsers through the AppRTC server.<br /> <br /> <h3> Test Design</h3> Instead of designing a new signaling solution from scratch, we chose to use the AppRTC application we already had. This has the additional benefit of testing the AppRTC code, which we are also maintaining. We could also have used the small <a href="https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjingle/libjingle.gyp&q=peerconnection_server&sq=package:chromium&type=cs&l=289">peerconnection_server</a> binary and some JavaScript, which would give us additional flexibility in what to test. We chose to go with AppRTC since it effectively implements the signaling for us, leading to much less test code. <br /> <br /> We assumed we would be able to get hold of the latest nightly Firefox and be able to launch that with a given URL. For the Chrome side, we assumed we would be running in a browser test, i.e. on a complete Chrome with some test scaffolding around it. For the first sketch of the test, we imagined just connecting the browsers to the live <a href="http://apprtc.appspot.com/">apprtc.appspot.com</a> with some random room number. If the call got established, we would be able to look at the remote video feed on the Chrome side and verify that video was playing (for instance using the <a href="http://googlechrome.github.io/webrtc/samples/web/content/getusermedia-canvas">video+canvas grab trick</a>). Furthermore, we could verify that audio was playing, for instance by using <a href="http://googlechrome.github.io/webrtc/samples/web/content/getusermedia-volume">WebRTC getStats</a> to measure the audio track energy level. <br /> <br /> <div class="separator" style="clear: both; text-align: center;"> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGVzL0DcoTmuyYSQdoaMzOTbBqr2Si69Hv8NoDwRc6rHYQ4_PTNgmYcRHcoe78owHgH50kkA6wD7Ec3E0GsUARSbEvVx34zTXOyQVObb4DzlD41hRh80OzAuNXhXZYTD-Iy10F/s1600/image01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGVzL0DcoTmuyYSQdoaMzOTbBqr2Si69Hv8NoDwRc6rHYQ4_PTNgmYcRHcoe78owHgH50kkA6wD7Ec3E0GsUARSbEvVx34zTXOyQVObb4DzlD41hRh80OzAuNXhXZYTD-Iy10F/s1600/image01.png" width="500" /></a></div> <div style="text-align: center;"> <i>Figure 2. Basic test design.</i></div> <br /> However, since we like tests to be <a href="http://googletesting.blogspot.se/2012/10/hermetic-servers.html">hermetic</a>, this isn’t a good design. I can see several problems. For example, if the network between us and AppRTC is unreliable. Also, what if someone has occupied myroomid? If that were the case, the test would fail and we would be none the wiser. So to make this thing work, we would have to find some way to bring up the AppRTC instance on localhost to make our test hermetic.<br /> <br /> <h3> Bringing up AppRTC on localhost</h3> AppRTC is a <a href="https://developers.google.com/appengine/">Google App Engine application</a>. As this <a href="https://developers.google.com/appengine/docs/python/gettingstartedpython27/helloworld">hello world example</a> demonstrates, one can test applications locally with<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">google_appengine/dev_appserver.py apprtc_code/</pre> <br /> So why not just call this from our test? It turns out we need to solve some complicated problems first, like how to ensure the AppEngine SDK and the AppRTC code is actually available on the executing machine, but we’ll get to that later. Let’s assume for now that stuff is just available. We can now write the browser test code to launch the local instance:<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><span style="color: #0433ff;">bool</span> LaunchApprtcInstanceOnLocalhost() <span style="color: #4f8f00;">// ... Figure out locations of SDK and apprtc code ...</span> CommandLine command_line(CommandLine::NO_PROGRAM); EXPECT_TRUE(GetPythonCommand(&command_line)); command_line.AppendArgPath(appengine_dev_appserver); command_line.AppendArgPath(apprtc_dir); command_line.AppendArg(<span style="color: #ff2600;">"--port=9999"</span>); command_line.AppendArg(<span style="color: #ff2600;">"--admin_port=9998"</span>); command_line.AppendArg(<span style="color: #ff2600;">"--skip_sdk_update_check"</span>); VLOG(1) << <span style="color: #ff2600;">"Running "</span> << command_line.GetCommandLineString(); <span style="color: #0433ff;">return</span> base::LaunchProcess(command_line, base::LaunchOptions(), &dev_appserver_); } </pre> <br /> That’s pretty straightforward <a href="#foot1"><sup>[1]</sup></a>.<br /> <br /> <h3> Figuring out Whether the Local Server is Up </h3> Then we ran into a very typical test problem. So we have the code to get the server up, and launching the two browsers to connect to <span style="color: #38761d; font-family: Courier New, Courier, monospace;"><b>http://localhost:9999?r=some_room</b></span> is easy. But how do we know when to connect? When I first ran the test, it would work sometimes and sometimes not depending on if the server had time to get up. <br /> <br /> It’s tempting in these situations to just add a sleep to give the server time to get up. Don’t do that. That will result in a test that is flaky and/or slow. In these situations we need to identify what we’re really waiting for. We could probably monitor the stdout of the <b><span style="color: #38761d; font-family: Courier New, Courier, monospace;">dev_appserver.py</span></b> and look for some message that says “Server is up!” or equivalent. However, we’re really waiting for the server to be able to serve web pages, and since we have two browsers that are really good at connecting to servers, why not use them? Consider this code.<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><span style="color: #0433ff;">bool</span> LocalApprtcInstanceIsUp() { <span style="color: #4f8f00;">// Load the admin page and see if we manage to load it right.</span> ui_test_utils::NavigateToURL(browser(), GURL(<span style="color: #ff2600;">"localhost:9998"</span>)); content::WebContents* tab_contents = browser()->tab_strip_model()->GetActiveWebContents(); std::<span style="color: #0433ff;">string</span> javascript = <span style="color: #ff2600;">"window.domAutomationController.send(document.title)"</span>; std::<span style="color: #0433ff;">string</span> result; <span style="color: #0433ff;">if</span> (!content::ExecuteScriptAndExtractString(tab_contents, javascript, &result)) <span style="color: #0433ff;">return</span> <span style="color: #0433ff;">false</span>; <span style="color: #0433ff;">return</span> result == kTitlePageOfAppEngineAdminPage; } </pre> <br /> Here we ask Chrome to load the AppEngine admin page for the local server (we set the admin port to <span style="color: #38761d; font-family: Courier New, Courier, monospace;"><b>9998</b></span> earlier, remember?) and ask it what its title is. If that title is “Instances”, the admin page has been displayed, and the server must be up. If the server isn’t up, Chrome will fail to load the page and the title will be something like “<span style="color: #38761d; font-family: Courier New, Courier, monospace;"><b>localhost:9999</b></span> is not available”. <br /> <br /> Then, we can just do this from the test:<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><span style="color: #0433ff;">while</span> (!LocalApprtcInstanceIsUp()) VLOG(1) << <span style="color: #ff2600;">"Waiting for AppRTC to come up..."</span>; </pre> <br /> If the server never comes up, for whatever reason, the test will just time out in that loop. If it comes up we can safely proceed with the rest of test.<br /> <br /> <h3> Launching the Browsers </h3> A browser window launches itself as a part of every Chromium browser test. It’s also easy for the test to control the command line switches the browser will run under. <br /> <br /> We have less control over the Firefox browser since it is the “foreign” browser in this test, but we can still pass command-line options to it when we invoke the Firefox process. To make this easier, Mozilla provides a Python library called mozrunner. Using that we can set up a <a href="http://chromegw/viewvc/chrome/trunk/deps/third_party/webrtc/webrtc.DEPS/run_firefox_webrtc.py?revision=240895&view=markup">launcher python script</a> we can invoke from the test:<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><span style="color: #0433ff;">from</span> mozprofile <span style="color: #0433ff;">import</span> profile <span style="color: #0433ff;">from</span> mozrunner <span style="color: #0433ff;">import</span> runner WEBRTC_PREFERENCES = { <span style="color: #ff2600;">'media.navigator.permission.disabled'</span>: True, } <span style="color: #0433ff;">def</span> main(): <span style="color: #4f8f00;"># Set up flags, handle SIGTERM, etc</span> <span style="color: #4f8f00;"># ...</span> firefox_profile = profile.FirefoxProfile(preferences=WEBRTC_PREFERENCES) firefox_runner = runner.FirefoxRunner( profile=firefox_profile, binary=options.binary, cmdargs=[options.webpage]) firefox_runner.start()</pre> <br /> Notice that we need to pass special preferences to make Firefox accept the getUserMedia prompt. Otherwise, the test would get stuck on the prompt and we would be unable to set up a call. Alternatively, we could employ some kind of clickbot to click “Allow” on the prompt when it pops up, but that is way harder to set up. <br /> <br /> Without going into too much detail, the code for launching the browsers becomes<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">GURL room_url = GURL(base::StringPrintf(<span style="color: #ff2600;">"http://localhost:9999?r=room_%d"</span>, base::RandInt(0, 65536))); content::WebContents* chrome_tab = OpenPageAndAcceptUserMedia(room_url); ASSERT_TRUE(LaunchFirefoxWithUrl(room_url));</pre> <br /> Where LaunchFirefoxWithUrl essentially runs this:<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">run_firefox_webrtc.py --binary /path/to/firefox --webpage http:<span style="color: #4f8f00;">//localhost::9999?r=my_room</span></pre> <br /> Now we can launch the two browsers. Next time we will look at how we actually verify that the call worked, and how we actually download all resources needed by the test in a maintainable and automated manner. Stay tuned!<br /> <br /> <hr /> <sup id="foot1">1</sup> The explicit ports are because the default ports collided on the bots we were running on, and the --skip_sdk_update_check was because the SDK stopped and asked us something if there was an update. <br /> <br /> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> <i>by Patrik Höglund </i><br /> <br /> <a href="http://www.webrtc.org/">WebRTC</a> enables real time peer-to-peer video and voice transfer in the browser, making it possible to build, among other things, a <a href="https://apprtc.appspot.com/">working video chat</a> with a <a href="https://github.com/GoogleChrome/webrtc/tree/master/samples/web/content/apprtc">small amount of Python and JavaScript</a>. As a web standard, it has several unusual properties which makes it hard to test. A regular web standard generally accepts HTML text and yields a bitmap as output (what you see in the browser). For WebRTC, we have real-time RTP media streams on one side being sent to another WebRTC-enabled endpoint. These RTP packets have been jumping across NAT, through firewalls and perhaps through TURN servers to deliver hopefully stutter-free and low latency media. <br /> <br /> WebRTC is probably the only web standard in which we need to test direct communication between Chrome and other browsers. Remember, WebRTC builds on peer-to-peer technology, which means we talk directly between browsers rather than through a server. Chrome, Firefox and Opera have announced support for WebRTC so far. To test interoperability, we set out to build an automated test to ensure that Chrome and Firefox can get a call up. This article describes how we implemented such a test and the tradeoffs we made along the way.<br /> <br /> <h3> Calling in WebRTC </h3> Setting up a WebRTC call requires passing SDP blobs over a signaling connection. These blobs contain information on the capabilities of the endpoint, such as what media formats it supports and what preferences it has (for instance, perhaps the endpoint has VP8 decoding hardware, which means the endpoint will handle VP8 more efficiently than, say, H.264). By sending these blobs the endpoints can agree on what media format they will be sending between themselves and how to traverse the network between them. Once that is done, the browsers will talk directly to each other, and nothing gets sent over the signaling connection.<br /> <br /> <div class="separator" style="clear: both; text-align: center;"> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPSI18tUi-P0U03LzJcP6bbk8PSB-5fXLi-HSPGJ-1zexNRpVxKREigxle-R8eAQLxxzAflu-LF5XLVZyFBjFD7u93CVnO7pDKTfZq_xU9DuiVIRhbsluyq-L9WMzIghB1R_bX/s1600/image00.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjPSI18tUi-P0U03LzJcP6bbk8PSB-5fXLi-HSPGJ-1zexNRpVxKREigxle-R8eAQLxxzAflu-LF5XLVZyFBjFD7u93CVnO7pDKTfZq_xU9DuiVIRhbsluyq-L9WMzIghB1R_bX/s1600/image00.png" width="500" /></a></div> <div style="text-align: center;"> <i>Figure 1. Signaling and media connections.</i></div> <br /> How these blobs are sent is up to the application. Usually the browsers connect to some server which mediates the connection between the browsers, for instance by using a contact list or a room number. The <a href="https://apprtc.appspot.com/">AppRTC reference application</a> uses room numbers to pair up browsers and sends the SDP blobs from the browsers through the AppRTC server.<br /> <br /> <h3> Test Design</h3> Instead of designing a new signaling solution from scratch, we chose to use the AppRTC application we already had. This has the additional benefit of testing the AppRTC code, which we are also maintaining. We could also have used the small <a href="https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjingle/libjingle.gyp&q=peerconnection_server&sq=package:chromium&type=cs&l=289">peerconnection_server</a> binary and some JavaScript, which would give us additional flexibility in what to test. We chose to go with AppRTC since it effectively implements the signaling for us, leading to much less test code. <br /> <br /> We assumed we would be able to get hold of the latest nightly Firefox and be able to launch that with a given URL. For the Chrome side, we assumed we would be running in a browser test, i.e. on a complete Chrome with some test scaffolding around it. For the first sketch of the test, we imagined just connecting the browsers to the live <a href="http://apprtc.appspot.com/">apprtc.appspot.com</a> with some random room number. If the call got established, we would be able to look at the remote video feed on the Chrome side and verify that video was playing (for instance using the <a href="http://googlechrome.github.io/webrtc/samples/web/content/getusermedia-canvas">video+canvas grab trick</a>). Furthermore, we could verify that audio was playing, for instance by using <a href="http://googlechrome.github.io/webrtc/samples/web/content/getusermedia-volume">WebRTC getStats</a> to measure the audio track energy level. <br /> <br /> <div class="separator" style="clear: both; text-align: center;"> <a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGVzL0DcoTmuyYSQdoaMzOTbBqr2Si69Hv8NoDwRc6rHYQ4_PTNgmYcRHcoe78owHgH50kkA6wD7Ec3E0GsUARSbEvVx34zTXOyQVObb4DzlD41hRh80OzAuNXhXZYTD-Iy10F/s1600/image01.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjGVzL0DcoTmuyYSQdoaMzOTbBqr2Si69Hv8NoDwRc6rHYQ4_PTNgmYcRHcoe78owHgH50kkA6wD7Ec3E0GsUARSbEvVx34zTXOyQVObb4DzlD41hRh80OzAuNXhXZYTD-Iy10F/s1600/image01.png" width="500" /></a></div> <div style="text-align: center;"> <i>Figure 2. Basic test design.</i></div> <br /> However, since we like tests to be <a href="http://googletesting.blogspot.se/2012/10/hermetic-servers.html">hermetic</a>, this isn’t a good design. I can see several problems. For example, if the network between us and AppRTC is unreliable. Also, what if someone has occupied myroomid? If that were the case, the test would fail and we would be none the wiser. So to make this thing work, we would have to find some way to bring up the AppRTC instance on localhost to make our test hermetic.<br /> <br /> <h3> Bringing up AppRTC on localhost</h3> AppRTC is a <a href="https://developers.google.com/appengine/">Google App Engine application</a>. As this <a href="https://developers.google.com/appengine/docs/python/gettingstartedpython27/helloworld">hello world example</a> demonstrates, one can test applications locally with<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">google_appengine/dev_appserver.py apprtc_code/</pre> <br /> So why not just call this from our test? It turns out we need to solve some complicated problems first, like how to ensure the AppEngine SDK and the AppRTC code is actually available on the executing machine, but we’ll get to that later. Let’s assume for now that stuff is just available. We can now write the browser test code to launch the local instance:<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><span style="color: #0433ff;">bool</span> LaunchApprtcInstanceOnLocalhost() <span style="color: #4f8f00;">// ... Figure out locations of SDK and apprtc code ...</span> CommandLine command_line(CommandLine::NO_PROGRAM); EXPECT_TRUE(GetPythonCommand(&command_line)); command_line.AppendArgPath(appengine_dev_appserver); command_line.AppendArgPath(apprtc_dir); command_line.AppendArg(<span style="color: #ff2600;">"--port=9999"</span>); command_line.AppendArg(<span style="color: #ff2600;">"--admin_port=9998"</span>); command_line.AppendArg(<span style="color: #ff2600;">"--skip_sdk_update_check"</span>); VLOG(1) << <span style="color: #ff2600;">"Running "</span> << command_line.GetCommandLineString(); <span style="color: #0433ff;">return</span> base::LaunchProcess(command_line, base::LaunchOptions(), &dev_appserver_); } </pre> <br /> That’s pretty straightforward <a href="#foot1"><sup>[1]</sup></a>.<br /> <br /> <h3> Figuring out Whether the Local Server is Up </h3> Then we ran into a very typical test problem. So we have the code to get the server up, and launching the two browsers to connect to <span style="color: #38761d; font-family: Courier New, Courier, monospace;"><b>http://localhost:9999?r=some_room</b></span> is easy. But how do we know when to connect? When I first ran the test, it would work sometimes and sometimes not depending on if the server had time to get up. <br /> <br /> It’s tempting in these situations to just add a sleep to give the server time to get up. Don’t do that. That will result in a test that is flaky and/or slow. In these situations we need to identify what we’re really waiting for. We could probably monitor the stdout of the <b><span style="color: #38761d; font-family: Courier New, Courier, monospace;">dev_appserver.py</span></b> and look for some message that says “Server is up!” or equivalent. However, we’re really waiting for the server to be able to serve web pages, and since we have two browsers that are really good at connecting to servers, why not use them? Consider this code.<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><span style="color: #0433ff;">bool</span> LocalApprtcInstanceIsUp() { <span style="color: #4f8f00;">// Load the admin page and see if we manage to load it right.</span> ui_test_utils::NavigateToURL(browser(), GURL(<span style="color: #ff2600;">"localhost:9998"</span>)); content::WebContents* tab_contents = browser()->tab_strip_model()->GetActiveWebContents(); std::<span style="color: #0433ff;">string</span> javascript = <span style="color: #ff2600;">"window.domAutomationController.send(document.title)"</span>; std::<span style="color: #0433ff;">string</span> result; <span style="color: #0433ff;">if</span> (!content::ExecuteScriptAndExtractString(tab_contents, javascript, &result)) <span style="color: #0433ff;">return</span> <span style="color: #0433ff;">false</span>; <span style="color: #0433ff;">return</span> result == kTitlePageOfAppEngineAdminPage; } </pre> <br /> Here we ask Chrome to load the AppEngine admin page for the local server (we set the admin port to <span style="color: #38761d; font-family: Courier New, Courier, monospace;"><b>9998</b></span> earlier, remember?) and ask it what its title is. If that title is “Instances”, the admin page has been displayed, and the server must be up. If the server isn’t up, Chrome will fail to load the page and the title will be something like “<span style="color: #38761d; font-family: Courier New, Courier, monospace;"><b>localhost:9999</b></span> is not available”. <br /> <br /> Then, we can just do this from the test:<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><span style="color: #0433ff;">while</span> (!LocalApprtcInstanceIsUp()) VLOG(1) << <span style="color: #ff2600;">"Waiting for AppRTC to come up..."</span>; </pre> <br /> If the server never comes up, for whatever reason, the test will just time out in that loop. If it comes up we can safely proceed with the rest of test.<br /> <br /> <h3> Launching the Browsers </h3> A browser window launches itself as a part of every Chromium browser test. It’s also easy for the test to control the command line switches the browser will run under. <br /> <br /> We have less control over the Firefox browser since it is the “foreign” browser in this test, but we can still pass command-line options to it when we invoke the Firefox process. To make this easier, Mozilla provides a Python library called mozrunner. Using that we can set up a <a href="http://chromegw/viewvc/chrome/trunk/deps/third_party/webrtc/webrtc.DEPS/run_firefox_webrtc.py?revision=240895&view=markup">launcher python script</a> we can invoke from the test:<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><span style="color: #0433ff;">from</span> mozprofile <span style="color: #0433ff;">import</span> profile <span style="color: #0433ff;">from</span> mozrunner <span style="color: #0433ff;">import</span> runner WEBRTC_PREFERENCES = { <span style="color: #ff2600;">'media.navigator.permission.disabled'</span>: True, } <span style="color: #0433ff;">def</span> main(): <span style="color: #4f8f00;"># Set up flags, handle SIGTERM, etc</span> <span style="color: #4f8f00;"># ...</span> firefox_profile = profile.FirefoxProfile(preferences=WEBRTC_PREFERENCES) firefox_runner = runner.FirefoxRunner( profile=firefox_profile, binary=options.binary, cmdargs=[options.webpage]) firefox_runner.start()</pre> <br /> Notice that we need to pass special preferences to make Firefox accept the getUserMedia prompt. Otherwise, the test would get stuck on the prompt and we would be unable to set up a call. Alternatively, we could employ some kind of clickbot to click “Allow” on the prompt when it pops up, but that is way harder to set up. <br /> <br /> Without going into too much detail, the code for launching the browsers becomes<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">GURL room_url = GURL(base::StringPrintf(<span style="color: #ff2600;">"http://localhost:9999?r=room_%d"</span>, base::RandInt(0, 65536))); content::WebContents* chrome_tab = OpenPageAndAcceptUserMedia(room_url); ASSERT_TRUE(LaunchFirefoxWithUrl(room_url));</pre> <br /> Where LaunchFirefoxWithUrl essentially runs this:<br /> <pre style="background: #f0f0f0; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">run_firefox_webrtc.py --binary /path/to/firefox --webpage http:<span style="color: #4f8f00;">//localhost::9999?r=my_room</span></pre> <br /> Now we can launch the two browsers. Next time we will look at how we actually verify that the call worked, and how we actually download all resources needed by the test in a maintainable and automated manner. Stay tuned!<br /> <br /> <hr /> <sup id="foot1">1</sup> The explicit ports are because the default ports collided on the bots we were running on, and the --skip_sdk_update_check was because the SDK stopped and asked us something if there was an update. <br /> <br /> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Google Testing Blog:Chrome - Firefox WebRTC Interop Test - Pt 1&url=https://testing.googleblog.com/2014/08/chrome-firefox-webrtc-interop-test-pt-1.html&via=googletesting'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> </span> <span class='fb-custom social-wrapper' data-href='https://www.facebook.com/sharer.php?u=https://testing.googleblog.com/2014/08/chrome-firefox-webrtc-interop-test-pt-1.html'> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </span> </div> <div class='comment-container'> <i class='comment-img material-icons'>  </i> <a href='https://testing.googleblog.com/2014/08/chrome-firefox-webrtc-interop-test-pt-1.html#comments' style='font-weight: 500; text-decoration: underline;'>2 comments</a> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://testing.googleblog.com/2014/08/chrome-firefox-webrtc-interop-test-pt-1.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> <span class='labels-caption'> Labels: </span> <span class='labels'> <a class='label' href='https://testing.googleblog.com/search/label/Patrik%20H%C3%B6glund' rel='tag'> Patrik Höglund </a> </span> </div> </div> </div> <div class='post' data-id='903802091935906990' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2014/08/testing-on-toilet-web-testing-made.html' itemprop='url' title='Testing on the Toilet: Web Testing Made Easier: Debug IDs'> Testing on the Toilet: Web Testing Made Easier: Debug IDs </a> </h2> <div class='post-header'> <div class='published'> <span class='publishdate' itemprop='datePublished'> Tuesday, August 12, 2014 </span> </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> <i>by Ruslan Khamitov </i><br /> <i><br /></i> <i>This article was adapted from a <a href="http://googletesting.blogspot.com/2007/01/introducing-testing-on-toilet.html">Google Testing on the Toilet (TotT) episode</a>. You can download a <a href="https://docs.google.com/document/d/1zHky363AF_eNVGOgnpD-7ouhjTG7QbYmCmGwbeFKruE/edit?usp=sharing">printer-friendly version</a> of this TotT episode and post it in your office.</i><br /> <br /> <b><span style="color: #990000;">Adding ID attributes to elements can make it much easier to write tests that interact with the DOM</span></b> (e.g., WebDriver tests). Consider the following DOM with two buttons that differ only by inner text:<br /> <table style="border-collapse: collapse; border: 1px solid black; width: 100%;"> <tbody> <tr> <td style="border: 1px solid black; text-align: center;">Save button</td> <td style="border: 1px solid black; text-align: center;">Edit button</td> </tr> <tr> <td style="background: #cfe2f3; border: 1px solid black;"><pre style="background: #cfe2f3; border-color: #7b7b7b; border-style: solid; border-width: 0px; color: black; overflow: auto; padding: 0px 5px;"><div class="button">Save</div></pre> </td><td style="background: #cfe2f3; border: 1px solid black;"><pre style="background: #cfe2f3; border-color: #7b7b7b; border-style: solid; border-width: 0px; color: black; overflow: auto; padding: 0px 5px;"><div class="button">Edit</div></pre> </td> </tr> </tbody></table> <br /> How would you tell WebDriver to interact with the “Save” button in this case? You have several options. <b><span style="color: #990000;">One option is to interact with the button using a CSS selector:</span></b><br /> <pre style="background: #cfe2f3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">div.button</pre> <br /> However, this approach is not sufficient to identify a particular button, and there is no mechanism to filter by text in CSS. <b><span style="color: #990000;">Another option would be to write an XPath, which is generally fragile and discouraged:</span></b><br /> <pre style="background: #cfe2f3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">//div[@class='button' and text()='Save']</pre> <br /> <b><span style="color: #990000;">Your best option is to add unique hierarchical IDs</span></b> where each widget is passed a base ID that it prepends to the ID of each of its children. The IDs for each button will be:<br /> <pre style="background: #d9ead3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><b><i>contact-form</i>.save-button <i>contact-form</i>.edit-button</b></pre> <br /> <b><span style="color: #990000;">In GWT you can accomplish this by overriding onEnsureDebugId()on your widgets</span></b>. Doing so allows you to create custom logic for applying debug IDs to the sub-elements that make up a custom widget:<br /> <pre style="background: #d9ead3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">@Override <span style="color: #0433ff;">protected</span> <span style="color: #0433ff;">void</span> <b>onEnsureDebugId</b>(String baseId) { <span style="color: #0433ff;">super</span>.<b>onEnsureDebugId</b>(baseId); saveButton.<b>ensureDebugId</b>(baseId + <span style="color: #ff2600;">".save-button"</span>); editButton.<b>ensureDebugId</b>(baseId + <span style="color: #ff2600;">".edit-button"</span>); }</pre> <br /> Consider another example. <b><span style="color: #990000;">Let’s set IDs for repeated UI elements in Angular</span></b> using ng-repeat. Setting an index can help differentiate between repeated instances of each element:<br /> <pre style="background: #d9ead3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><tr <b>id="feedback-{{$index}}</b>" class="feedback" ng-repeat="feedback in ctrl.feedbacks" ></pre> <br /> <b><span style="color: #990000;">In GWT you can do this with ensureDebugId()</span></b>. Let’s set an ID for each of the table cells:<br /> <pre style="background: #d9ead3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">@UiField FlexTable table; UIObject.ensureDebugId(table.getCellFormatter().getElement(rowIndex, columnIndex), <b>baseID</b> + <b>colIndex</b> + <span style="color: #ff2600;">"-"</span> + <b>rowIndex</b>);</pre> <br /> <span style="color: #990000;"><b>Take-away: Debug IDs are easy to set and make a huge difference for testing</b></span>. Please add them early.<br /> <br /> <span itemprop='author' itemscope='itemscope' itemtype='http://schema.org/Person'> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </span> </script> <noscript> <i>by Ruslan Khamitov </i><br /> <i><br /></i> <i>This article was adapted from a <a href="http://googletesting.blogspot.com/2007/01/introducing-testing-on-toilet.html">Google Testing on the Toilet (TotT) episode</a>. You can download a <a href="https://docs.google.com/document/d/1zHky363AF_eNVGOgnpD-7ouhjTG7QbYmCmGwbeFKruE/edit?usp=sharing">printer-friendly version</a> of this TotT episode and post it in your office.</i><br /> <br /> <b><span style="color: #990000;">Adding ID attributes to elements can make it much easier to write tests that interact with the DOM</span></b> (e.g., WebDriver tests). Consider the following DOM with two buttons that differ only by inner text:<br /> <table style="border-collapse: collapse; border: 1px solid black; width: 100%;"> <tbody> <tr> <td style="border: 1px solid black; text-align: center;">Save button</td> <td style="border: 1px solid black; text-align: center;">Edit button</td> </tr> <tr> <td style="background: #cfe2f3; border: 1px solid black;"><pre style="background: #cfe2f3; border-color: #7b7b7b; border-style: solid; border-width: 0px; color: black; overflow: auto; padding: 0px 5px;"><div class="button">Save</div></pre> </td><td style="background: #cfe2f3; border: 1px solid black;"><pre style="background: #cfe2f3; border-color: #7b7b7b; border-style: solid; border-width: 0px; color: black; overflow: auto; padding: 0px 5px;"><div class="button">Edit</div></pre> </td> </tr> </tbody></table> <br /> How would you tell WebDriver to interact with the “Save” button in this case? You have several options. <b><span style="color: #990000;">One option is to interact with the button using a CSS selector:</span></b><br /> <pre style="background: #cfe2f3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">div.button</pre> <br /> However, this approach is not sufficient to identify a particular button, and there is no mechanism to filter by text in CSS. <b><span style="color: #990000;">Another option would be to write an XPath, which is generally fragile and discouraged:</span></b><br /> <pre style="background: #cfe2f3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">//div[@class='button' and text()='Save']</pre> <br /> <b><span style="color: #990000;">Your best option is to add unique hierarchical IDs</span></b> where each widget is passed a base ID that it prepends to the ID of each of its children. The IDs for each button will be:<br /> <pre style="background: #d9ead3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><b><i>contact-form</i>.save-button <i>contact-form</i>.edit-button</b></pre> <br /> <b><span style="color: #990000;">In GWT you can accomplish this by overriding onEnsureDebugId()on your widgets</span></b>. Doing so allows you to create custom logic for applying debug IDs to the sub-elements that make up a custom widget:<br /> <pre style="background: #d9ead3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">@Override <span style="color: #0433ff;">protected</span> <span style="color: #0433ff;">void</span> <b>onEnsureDebugId</b>(String baseId) { <span style="color: #0433ff;">super</span>.<b>onEnsureDebugId</b>(baseId); saveButton.<b>ensureDebugId</b>(baseId + <span style="color: #ff2600;">".save-button"</span>); editButton.<b>ensureDebugId</b>(baseId + <span style="color: #ff2600;">".edit-button"</span>); }</pre> <br /> Consider another example. <b><span style="color: #990000;">Let’s set IDs for repeated UI elements in Angular</span></b> using ng-repeat. Setting an index can help differentiate between repeated instances of each element:<br /> <pre style="background: #d9ead3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;"><tr <b>id="feedback-{{$index}}</b>" class="feedback" ng-repeat="feedback in ctrl.feedbacks" ></pre> <br /> <b><span style="color: #990000;">In GWT you can do this with ensureDebugId()</span></b>. Let’s set an ID for each of the table cells:<br /> <pre style="background: #d9ead3; border-color: #7b7b7b; border-style: solid; border-width: 1px; color: black; overflow: auto; padding: 10px;">@UiField FlexTable table; UIObject.ensureDebugId(table.getCellFormatter().getElement(rowIndex, columnIndex), <b>baseID</b> + <b>colIndex</b> + <span style="color: #ff2600;">"-"</span> + <b>rowIndex</b>);</pre> <br /> <span style="color: #990000;"><b>Take-away: Debug IDs are easy to set and make a huge difference for testing</b></span>. 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class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2019/07/'> Jul </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2019/01/'> Jan </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2018/'> 2018 </a> <span class='post-count' dir='ltr'>(7)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2018/11/'> Nov </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2018/09/'> Sep </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2018/07/'> Jul </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2018/06/'> Jun </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2018/05/'> May </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2018/02/'> Feb </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/'> 2017 </a> <span class='post-count' dir='ltr'>(17)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/12/'> Dec </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/11/'> Nov </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/10/'> Oct </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/09/'> Sep </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/08/'> Aug </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/07/'> Jul </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/06/'> Jun </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/05/'> May </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/04/'> Apr </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/02/'> Feb </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2017/01/'> Jan </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/'> 2016 </a> <span class='post-count' dir='ltr'>(15)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/12/'> Dec </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/11/'> Nov </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/10/'> Oct </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/09/'> Sep </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/08/'> Aug </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/06/'> Jun </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/05/'> May </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/04/'> Apr </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2016/03/'> Mar </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' 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class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/10/'> Oct </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/08/'> Aug </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/06/'> Jun </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' 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class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2015/01/'> Jan </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate expanded'> <a class='toggle' href='javascript:void(0)'> <span class='zippy toggle-open'> ▼  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/'> 2014 </a> <span class='post-count' dir='ltr'>(24)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/12/'> Dec </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/11/'> Nov </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/10/'> Oct </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/09/'> Sep </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate expanded'> <a class='toggle' href='javascript:void(0)'> <span class='zippy toggle-open'> ▼  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/08/'> Aug </a> <span class='post-count' dir='ltr'>(2)</span> <ul class='posts'> <li> <a href='https://testing.googleblog.com/2014/08/chrome-firefox-webrtc-interop-test-pt-1.html'> Chrome - Firefox WebRTC Interop Test - Pt 1 </a> </li> <li> <a href='https://testing.googleblog.com/2014/08/testing-on-toilet-web-testing-made.html'> Testing on the Toilet: Web Testing Made Easier: De... </a> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/07/'> Jul </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/06/'> Jun </a> <span class='post-count' dir='ltr'>(3)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/05/'> May </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/04/'> Apr </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/03/'> Mar </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/02/'> Feb </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2014/01/'> Jan </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/'> 2013 </a> <span class='post-count' dir='ltr'>(16)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/12/'> Dec </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/11/'> Nov </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/10/'> Oct </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/08/'> Aug </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/07/'> Jul </a> <span class='post-count' dir='ltr'>(1)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/06/'> Jun </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/05/'> May </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/04/'> Apr </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/03/'> Mar </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2013/01/'> Jan </a> <span class='post-count' dir='ltr'>(2)</span> </li> </ul> </li> </ul> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2012/'> 2012 </a> <span class='post-count' dir='ltr'>(11)</span> <ul class='hierarchy'> <li class='archivedate collapsed'> <a class='toggle' href='javascript:void(0)'> <span class='zippy'> ►  </span> </a> <a class='post-count-link' href='https://testing.googleblog.com/2012/12/'> Dec </a> <span class='post-count' 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style='margin-top: -16px;' width='92'/> </a> <ul> <li> <a href='//www.google.com/'> Google </a> </li> <li> <a href='//www.google.com/policies/privacy/'> Privacy </a> </li> <li> <a href='//www.google.com/policies/terms/'> Terms </a> </li> </ul> </div> </div> <script type='text/javascript'> //<![CDATA[ // Social sharing popups. var postEl = document.getElementsByClassName('social-wrapper'); var postCount = postEl.length; for(i=0; i<postCount;i++){ postEl[i].addEventListener("click", function(event){ var postUrl = this.getAttribute("data-href"); window.open( postUrl,'popUpWindow','height=500,width=500,left=10,top=10,resizable=yes,scrollbars=yes,toolbar=yes,menubar=no,location=no,directories=no,status=yes'); });} //]]> </script> <script type='text/javascript'> //<![CDATA[ var BreakpointHandler = function() { this.initted = false; this.isHomePage = false; this.isMobile = false; }; BreakpointHandler.prototype.finalizeSummary = function(summaryHtml, lastNode) { // Use $.trim for IE8 compatibility summaryHtml = $.trim(summaryHtml).replace(/(<br>|\s)+$/,''); if (lastNode.nodeType == 3) { var lastChar = summaryHtml.slice(-1); if (!lastChar.match(/[.”"?]/)) { if (!lastChar.match(/[A-Za-z]/)) { summaryHtml = summaryHtml.slice(0, -1); } summaryHtml += ' ...'; } } else if (lastNode.nodeType == 1 && (lastNode.nodeName == 'I' || lastNode.nodeName == 'A')) { summaryHtml += ' ...'; } return summaryHtml; }; BreakpointHandler.prototype.generateSummaryFromContent = function(content, numWords) { var seenWords = 0; var summaryHtml = ''; for (var i=0; i < content.childNodes.length; i++) { var node = content.childNodes[i]; var nodeText; if (node.nodeType == 1) { if (node.hasAttribute('data-about-pullquote')) { continue; } nodeText = node.textContent; if (nodeText === undefined) { // innerText for IE8 nodeText = node.innerText; } if (node.nodeName == 'DIV' || node.nodeName == 'B') { // Don't end early if we haven't seen enough words. if (seenWords < 10) { continue; } if (i > 0) { summaryHtml = this.finalizeSummary(summaryHtml, content.childNodes[i-1]); } break; } summaryHtml += node.outerHTML; } else if (node.nodeType == 3) { nodeText = node.nodeValue; summaryHtml += nodeText + ' '; } var words = nodeText.match(/\S+\s*/g); if (!words) { continue; } var remain = numWords - seenWords; if (words.length >= remain) { summaryHtml = this.finalizeSummary(summaryHtml, node); break; } seenWords += words.length; } return summaryHtml; }; BreakpointHandler.prototype.detect = function() { var match, pl = /\+/g, search = /([^&=]+)=?([^&]*)/g, decode = function (s) { return decodeURIComponent(s.replace(pl, " ")); }, query = window.location.search.substring(1); var urlParams = {}; while (match = search.exec(query)) urlParams[decode(match[1])] = decode(match[2]); this.isListPage = $('html').hasClass('list-page'); this.isMobile = urlParams['m'] === '1'; this.isHomePage = window.location.pathname == '/'; }; BreakpointHandler.prototype.initContent = function() { var self = this; $('.post').each(function(index) { var body = $(this).children('.post-body')[0]; var content = $(body).children('.post-content')[0]; $(content).addClass('post-original'); var data = $(content).children('script').html(); data = self.rewriteForSSL(data); // If exists, extract specified editor's preview. var match = data.match(/([\s\S]+?)<div data-is-preview.+?>([\s\S]+)<\/div>/m); if (match) { data = match[1]; } // Prevent big images from loading when they aren't needed. // This must be done as a pre-injection step, since image loading can't be // canceled once embedded into the DOM. if (self.isListPage && self.isMobile) { data = data.replace(/<(img|iframe) .+?>/g, ''); } // Insert template to be rendered as nodes. content.innerHTML = data; if (self.isListPage) { var summary = document.createElement('div'); $(summary).addClass('post-content'); $(summary).addClass('post-summary'); body.insertBefore(summary, content); if (match) { // Use provided summary. summary.innerHTML = match[2]; } else { // Generate a summary. // Summary generation relies on DOM, so it must occur after content is // inserted into the page. summary.innerHTML = self.generateSummaryFromContent(content, 30); } // Add read more link to summary. var titleAnchor = $(this).find('.title a')[0]; var link = titleAnchor.cloneNode(true); link.innerHTML = 'Read More'; $(link).addClass('read-more'); summary.appendChild(link); } }); // Firefox does not allow for proper styling of BR. if (navigator.userAgent.indexOf('Firefox') > -1) { $('.post-content br').replaceWith('<span class="space"></span>'); } $('.loading').removeClass('loading'); }; BreakpointHandler.prototype.process = function() { if (!this.initted) { var makeInsecureImageRegex = function(hosts) { var whitelist = hosts.join('|').replace(/\./g,'\\.'); // Normal image tags, plus input images (yes, this is possible!) return new RegExp('(<(img|input)[^>]+?src=("|\'))http:\/\/(' + whitelist +')', 'g'); }; this.sslImageRegex = makeInsecureImageRegex(BreakpointHandler.KNOWN_HTTPS_HOSTS); this.sslImageCurrentDomainRegex = makeInsecureImageRegex([window.location.hostname]); this.detect(); this.initContent(); this.initted = true; } }; BreakpointHandler.KNOWN_HTTPS_HOSTS = [ "www.google.org", "www.google.com", "services.google.com", "blogger.com", "draft.blogger.com", "www.blogger.com", "photos1.blogger.com", "photos2.blogger.com", "photos3.blogger.com", "blogblog.com", "img1.blogblog.com", "img2.blogblog.com", "www.blogblog.com", "www1.blogblog.com", "www2.blogblog.com", "0.bp.blogspot.com", "1.bp.blogspot.com", "2.bp.blogspot.com", "3.bp.blogspot.com", "4.bp.blogspot.com", "lh3.googleusercontent.com", "lh4.googleusercontent.com", "lh5.googleusercontent.com", "lh6.googleusercontent.com", "themes.googleusercontent.com", ]; BreakpointHandler.prototype.rewriteForSSL = function(html) { // Handle HTTP -> HTTPS source replacement of images, movies, and other embedded content. return html.replace(this.sslImageRegex, '$1https://$4') .replace(this.sslImageCurrentDomainRegex, '$1//$4') .replace(/(<(embed|iframe)[^>]+?src=("|'))http:\/\/([^"']*?(youtube|picasaweb\.google)\.com)/g, '$1https://$4') // Slideshow SWF takes a image host, so we need to rewrite that parameter. .replace(/(<embed[^>]+?feed=http(?=[^s]))/g, '$1s'); }; $(document).ready(function() { var handler = new BreakpointHandler(); handler.process(); // Top-level navigation. $(".BlogArchive .tab").click(function(ev) { ev.preventDefault(); $(this).parent().toggleClass('active'); $(this).siblings().slideToggle(300); }); $(".Label .tab").click(function(ev) { ev.preventDefault(); $(this).parent().toggleClass('active'); $(this).siblings().slideToggle(300); }); // Blog archive year expansion. $('.BlogArchive .intervalToggle').click(function(ev) { ev.preventDefault(); if ($(this).parent().hasClass('collapsed')) { $(this).parent().removeClass('collapsed'); $(this).parent().addClass('expanded'); } else { $(this).parent().removeClass('expanded'); $(this).parent().addClass('collapsed'); } }); // Reverse order of months. $('.BlogArchive .intervalToggle + div').each(function(_, items) { var year = $(this); year.children().each(function(_, month) { year.prepend(month); }); }); // Set anchors to open in new tab. $('.post-content img').parent().each(function(_, node) { if (node.nodeName == 'A') { $(this).attr('target', '_blank'); } }); // Process search requests. $('.searchBox input').on("keypress", function(ev) { if (ev.which == 13) { window.location.href = 'https://www.google.com/search?q=site%3A' + window.location.hostname + '%20' + encodeURIComponent ($(this).val()); } }); }); (function($, window) { var archiveButton = $($('#sidebar .widget.BlogArchive h2')[0]); var folderIcon = $('#sidebar .widget.BlogArchive h2::after'); var archivePanel = $('#BlogArchive1'); archiveButton.click(function(e) { if (archivePanel.hasClass('archive-open')) { // It's open, so now we close it archivePanel.removeClass('archive-open'); archivePanel.addClass('archive-closed'); archiveButton.removeClass('archive-open'); archiveButton.addClass('archive-closed'); archivePanel.css('height', '60px'); } else { // It's closed, so open it archivePanel.removeClass('archive-closed'); archivePanel.addClass('archive-open'); archiveButton.removeClass('archive-closed'); archiveButton.addClass('archive-open'); archivePanel.css('height', 'auto'); folderIcon.css('content', 'https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggkDzi8QVSua_XxLOnfxWE_8nQc1MAhRPBxJej91JW2ZBbKvb2TjaNf66ZoTqCrBivwRr-TLJYxFm2ZAiMd-zfbJ0TjblXGvUszWFbdRncNOL7jseiJCL9uQoqN8BM8FpesdSw/s1600/keyboard_arrow_up_grey600_24dp.png'); } }); })($, window); (function ($, window, devsite) { devsite.devsite = {}; devsite.expandLeftNav = devsite.expandLeftNav || {}; devsite.expandLeftNav.ANALYTICS_LABEL_ = 'Hamburger menu'; devsite.expandLeftNav.ANALYTICS_ACTION_OPEN_ = 'Open'; devsite.expandLeftNav.ANALYTICS_ACTION_CLOSE_ = 'Close'; devsite.expandLeftNav.lastState_ = 0; devsite.expandLeftNav.chekovEnabled_ = false; devsite.expandLeftNav.init = function () { devsite.expandLeftNav.chekovEnabled_ = true; var navElement; if (devsite.expandLeftNav.chekovEnabled_) { navElement = $('.devsite-nav-responsive'); } else { navElement = $('.devsite-section-nav-responsive'); } this.drawerWidth = parseInt(navElement.css('width')); navElement.css({ 'left': -(this.drawerWidth) }); var expandButton = $('.devsite-expand-section-nav'); expandButton.click(function () { devsite.expandLeftNav.handleNavigationOpened(); }); navElement.find('.devsite-nav-responsive-forward').click( devsite.expandLeftNav.openPanel); navElement.find('.devsite-nav-responsive-back').click( devsite.expandLeftNav.closePanel); if ($('.devsite-nav-responsive-tabs-panel + ' + '.devsite-nav-responsive-sidebar-panel').length) { devsite.expandLeftNav.openPanel(); } }; devsite.expandLeftNav.handleNavigationOpened = function (opt_noAnimate) { var mask; if (devsite.expandLeftNav.chekovEnabled_) { var nav = $('.devsite-nav-responsive'); if (opt_noAnimate) { nav.addClass('devsite-nav-responsive-no-animate'); mask = devsite.devsite.showSiteMask(0); } else { mask = devsite.devsite.showSiteMask(); } nav.addClass('devsite-nav-responsive-open'); } else { devsite.expandLeftNav.lastState_ = devsite.sticky.currentState; devsite.sticky.setState(devsite.sticky.state.COLLAPSED_HEADER); var headerHeight = devsite.sticky.getHeaderHeight() - devsite.sticky.desiredMargin; var drawerHeight = $(window).height() - headerHeight; mask = devsite.devsite.showArticleMask(); $('.devsite-section-nav-responsive').css({ 'height': drawerHeight, 'left': '0', 'top': headerHeight, 'visibility': 'visible' }).focus(); } $(mask).click(devsite.expandLeftNav.handleNavigationClosed); $(document).on('keydown.escape', function (e) { if (e.keyCode == $.ui.keyCode.ESCAPE) { devsite.expandLeftNav.handleNavigationClosed(); $(document).off('keydown.escape'); } }); }; devsite.expandLeftNav.getScrollTop = function () { return $(window).scrollTop(); }; devsite.expandLeftNav.handleNavigationClosed = function () { var nav; if (devsite.expandLeftNav.chekovEnabled_) { nav = $('.devsite-nav-responsive'); devsite.devsite.hideSiteMask(); nav.removeClass('devsite-nav-responsive-open ' + 'devsite-nav-responsive-no-animate'); } else { nav = $('.devsite-section-nav-responsive'); devsite.devsite.hideArticleMask(); devsite.sticky.setState(devsite.expandLeftNav.lastState_); nav .css('left', -(devsite.expandLeftNav.drawerWidth)) .one('transitionend', function () { nav.css('visibility', 'hidden'); }); } nav.scrollTop(0); }; devsite.expandLeftNav.openPanel = function () { var parentPanel = $('.devsite-nav-responsive-tabs-panel'); var childPanel = $('.devsite-nav-responsive-sidebar-panel'); childPanel.show(); parentPanel .addClass('devsite-nav-responsive-transition') .addClass('devsite-nav-responsive-transform') .one('transitionend', function () { childPanel .removeClass('devsite-nav-responsive-transition') 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