YUI Library Examples: Test: Asynchronous Event Testing

Test: Asynchronous Event Testing

Asynchronous Events Test Example

This example begins by creating a namespace:

Y.namespace("example.test");

Y.namespace("example.test");

This namespace serves as the core object upon which others will be added (to prevent creating global objects).

Creating the TestCase

The first step is to create a new Y.Test.Caseobject called AsyncTestCase. To do so, using the Y.Test.Caseconstructor and pass in an object literal containing information about the tests to be run:

Y.example.test.AsyncTestCase = new Y.Test.Case({
 
    //name of the test case - if not provided, one is auto-generated
    name : "Animation Tests",
 
    //---------------------------------------------------------------------
    // Test methods - names must begin with "test"
    //---------------------------------------------------------------------
 
    testAnimation : function (){
 
        var myAnim = new Y.Anim({
                node: '#testDiv',
                to: {
                    width: 400
                },
                duration: 3,
                easing: Y.Easing.easeOut
        });
 
        //assign oncomplete handler
        myAnim.on("end", function(){
 
            //tell the TestRunner to resume
            this.resume(function(){
 
                Y.Assert.areEqual(document.getElementById("testDiv").offsetWidth, 400, "Width of the DIV should be 400.");
 
            });
 
        }, this, true);
 
        //start the animation
        myAnim.run();
 
        //wait until something happens
        this.wait();
 
    }
 
});

Y.example.test.AsyncTestCase = new Y.Test.Case({
 
    //name of the test case - if not provided, one is auto-generated
    name : "Animation Tests",
 
    //---------------------------------------------------------------------
    // Test methods - names must begin with "test"
    //---------------------------------------------------------------------
 
    testAnimation : function (){
 
        var myAnim = new Y.Anim({
                node: '#testDiv',
                to: {
                    width: 400
                },
                duration: 3,
                easing: Y.Easing.easeOut
        });
 
        //assign oncomplete handler
        myAnim.on("end", function(){
 
            //tell the TestRunner to resume
            this.resume(function(){
 
                Y.Assert.areEqual(document.getElementById("testDiv").offsetWidth, 400, "Width of the DIV should be 400.");
 
            });
 
        }, this, true);
 
        //start the animation
        myAnim.run();
 
        //wait until something happens
        this.wait();
 
    }
 
});

The only test in the Y.Test.Caseis called testAnimation. It begins by creating a new Anim object that will animate the width of a div to 400 pixels over three seconds. An event handler is assigned to the Anim object's end event, within which the resume() method is called. A function is passed into the resume() method to indicate the code to run when the test resumes, which is a test to make sure the width is 400 pixels. After that, the run() method is called to begin the animation and the wait() method is called to tell the Y.Test.Runner to wait until it is told to resume testing again. When the animation completes, the end event is fired and the test resumes, assuring that the width is correct.

Running the tests

With all of the tests defined, the last step is to run them:

//create the console
var r = new Y.Console({
    verbose : true,
    newestOnTop : false
});
 
r.render('#testLogger');
 
//create the logger
Y.Test.Runner.add(Y.example.test.AsyncTestCase);
 
//run the tests
Y.Test.Runner.run();

//create the console
var r = new Y.Console({
    verbose : true,
    newestOnTop : false
});
 
r.render('#testLogger');
 
//create the logger
Y.Test.Runner.add(Y.example.test.AsyncTestCase);
 
//run the tests
Y.Test.Runner.run();

Before running the tests, it's necessary to create a Y.Console object to display the results (otherwise the tests would run but you wouldn't see the results). After that, the Y.Test.Runner is loaded with the Y.Test.Caseobject by calling add() (any number of Y.Test.Caseand TestSuite objects can be added to a Y.Test.Runner, this example only adds one for simplicity). The very last step is to call run(), which begins executing the tests in its queue and displays the results in the Y.Console.