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<title>YUI Library Examples: YUI Test Utility: Asynchronous Event Testing</title>
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
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<div id="pagetitle"><h1>YUI Library Examples: YUI Test Utility: Asynchronous Event Testing</h1></div>
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<div id="yui-main">
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<div class="yui-b">
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<div class="yui-ge">
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<div class="yui-u first example">
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<div class="promo">
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<h1>YUI Test Utility: Asynchronous Event Testing</h1>
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<div class="exampleIntro">
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<p>This example shows how to create an asynchronous test with the YUI Test framework for testing browser-based JavaScript code.
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A <a href="/yui/yuitest/#testcase"><code>TestCase</code></a> object is created to test the
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<a href="/yui/docs/YAHOO.util.Anim.html"><code>Anim</code></a> object. The test waits until the animation is complete
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before checking the settings of the animated element.</p>
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</div>
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<div class="example-container module ">
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<div class="hd exampleHd">
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<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="yt-async-event-tests_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
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</div> <div id="example-canvas" class="bd">
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
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<div id="testLogger"></div>
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<div id="testDiv" style="position:absolute;width:10px;height:10px"></div>
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<script type="text/javascript">
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YAHOO.namespace("example.yuitest");
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YAHOO.example.yuitest.AsyncTestCase = new YAHOO.tool.TestCase({
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//name of the test case - if not provided, one is auto-generated
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name : "Animation Tests",
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//---------------------------------------------------------------------
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// Test methods - names must begin with "test"
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//---------------------------------------------------------------------
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testAnimation : function (){
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var Assert = YAHOO.util.Assert;
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var YUD = YAHOO.util.Dom;
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//animate width to 400px
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var myAnim = new YAHOO.util.Anim('testDiv', { width: { to: 400 } }, 3, YAHOO.util.Easing.easeOut);
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//assign oncomplete handler
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myAnim.onComplete.subscribe(function(){
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//tell the TestRunner to resume
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this.resume(function(){
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Assert.areEqual(YUD.get("testDiv").offsetWidth, 400, "Width of the DIV should be 400.");
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});
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}, this, true);
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//start the animation
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myAnim.animate();
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//wait until something happens
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this.wait();
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}
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});
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YAHOO.util.Event.onDOMReady(function (){
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//create the logger
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var logger = new YAHOO.tool.TestLogger("testLogger");
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YAHOO.tool.TestRunner.add(YAHOO.example.yuitest.AsyncTestCase);
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//run the tests
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YAHOO.tool.TestRunner.run();
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});
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</script>
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<!--END SOURCE CODE FOR EXAMPLE =============================== -->
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</div>
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</div>
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</div>
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<h2 class="first">Asynchronous Events Test Example</h2>
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<p>This example begins by creating a namespace:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.namespace("example.yuitest");
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</textarea>
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<p>This namespace serves as the core object upon which others will be added (to prevent creating global objects).</p>
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<h3>Creating the TestCase</h3>
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<p>The first step is to create a new <a href="/yui/yuitest/#testcase"><code>TestCase</code></a> object called <code>AsyncTestCase</code>.
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To do so, using the <code>TestCase</code> constructor and pass in an object literal containing information about the tests to be run:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.example.yuitest.AsyncTestCase = new YAHOO.tool.TestCase({
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//name of the test case - if not provided, one is auto-generated
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name : "Animation Tests",
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//---------------------------------------------------------------------
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// Test methods - names must begin with "test"
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//---------------------------------------------------------------------
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testAnimation : function (){
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var Assert = YAHOO.util.Assert;
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var YUD = YAHOO.util.Dom;
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//animate width to 400px
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var myAnim = new YAHOO.util.Anim('testDiv', { width: { to: 400 } }, 3, YAHOO.util.Easing.easeOut);
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//assign oncomplete handler
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myAnim.onComplete.subscribe(function(){
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//tell the TestRunner to resume
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this.resume(function(){
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Assert.areEqual(YUD.get("testDiv").offsetWidth, 400, "Width of the DIV should be 400.");
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});
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}, this, true);
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//start the animation
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myAnim.animate();
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//wait until something happens
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this.wait();
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}
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});
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</textarea>
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<p>The only test in the <code>TestCase</code> is called <code>testAnimation</code>. It begins by creating a new
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<code>Anim</code> object that will animate the width of a <code>div</code> to 400 pixels over three seconds. An
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event handler is assigned to the <code>Anim</code> object's <code>onComplete</code> event, within which the
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<code>resume()</code> method is called. A function is passed into the <code>resume()</code> method to indicate
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the code to run when the test resumes, which is a test to make sure the width is 400 pixels. After that, the
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<code>animate()</code> method is called to begin the animation and the <code>wait()</code> method is called to
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tell the <code>TestRunner</code> to wait until it is told to resume testing again. When the animation completes,
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the <code>onComplete</code> event is fired and the test resumes, assuring that the width is correct.</p>
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<h3>Running the tests</h3>
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<p>With all of the tests defined, the last step is to run them. This initialization is assigned to take place when the document tree has been
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completely loaded by using the Event utility's <code>onDOMReady()</code> method:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.util.Event.onDOMReady(function (){
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//create the logger
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var logger = new YAHOO.tool.TestLogger();
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//add the test suite to the runner's queue
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YAHOO.tool.TestRunner.add(YAHOO.example.yuitest.AsyncTestCase);
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//run the tests
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YAHOO.tool.TestRunner.run();
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});
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</textarea>
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<p>Before running the tests, it's necessary to create a <code>TestLogger</code> object to display the results (otherwise the tests would run
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but you wouldn't see the results). After that, the <code>TestRunner</code> is loaded with the <code>TestCase</code> object by calling
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<code>add()</code> (any number of <code>TestCase</code> and <code>TestSuite</code> objects can be added to a <code>TestRunner</code>,
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this example only adds one for simplicity). The very last step is to call <code>run()</code>, which begins executing the tests in its
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queue and displays the results in the <code>TestLogger</code>.</p>
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<h2>Configuration for This Example</h2>
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<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?event&dom&animation&logger&yuitest&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
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</div>
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<div class="yui-u">
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<div id="examples">
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<h3 class='firstContent'>YUI Test Utility Examples:</h3>
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<div id="exampleToc">
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<ul>
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<li><a href='../yuitest/yt-simple-example.html'>Simple Testing Example</a></li><li><a href='../yuitest/yt-advanced-test-options.html'>Advanced Test Options</a></li><li><a href='../yuitest/yt-array-tests.html'>Array Processing</a></li><li><a href='../yuitest/yt-async-test.html'>Asynchronous Testing</a></li><li class='selected'><a href='../yuitest/yt-async-event-tests.html'>Asynchronous Event Testing</a></li> </ul>
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</div>
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</div>
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<div id="module">
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<h3>More YUI Test Utility Resources:</h3>
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<ul>
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<li><a href="http://developer.yahoo.com/yui/yuitest/">User's Guide</a> (external)</li>
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<li><a href="../../docs/module_yuitest.html">API Documentation</a></li>
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<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/yuitest.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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<li class="sect first">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! 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