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<title>YUI Library Examples: YUI Test Utility: Array Processing</title>
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<div id="pagetitle"><h1>YUI Library Examples: YUI Test Utility: Array Processing</h1></div>
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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: Array Processing</h1>
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<div class="exampleIntro">
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<p>This example shows how to use the <a href="/yui/yuitest/#arrayassert"><code>ArrayAssert</code></a> object, which
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contains assertions designed to be used specifically with JavaScript Arrays and array-like objects.</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-array-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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<script type="text/javascript">
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YAHOO.namespace("example.yuitest");
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YAHOO.example.yuitest.ArrayTestCase = new YAHOO.tool.TestCase({
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//the name of the test case - if not provided, one is automatically generated
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name: "Array Tests",
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//-------------------------------------------------------------------------
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// Setup and teardown
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//-------------------------------------------------------------------------
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/*
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* The setUp() method is used to setup data that necessary for a test to
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* run. This method is called immediately before each test method is run,
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* so it is run as many times as there are test methods.
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*/
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setUp : function () {
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this.data = new Array (0,1,2,3,4,5);
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},
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/*
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* The tearDown() method is used to clean up the initialization that was done
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* in the setUp() method. Ideally, it should free up all memory allocated in
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* setUp(), anticipating any possible changes to the data. This method is called
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* immediately after each test method is run.
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*/
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tearDown : function () {
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delete this.data;
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},
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//-------------------------------------------------------------------------
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// Basic tests - all method names must begin with "test"
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//-------------------------------------------------------------------------
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/*
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* Test the push() method.
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*/
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testPush : function() {
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//shortcut variables
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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this.data.push(6);
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//array-specific assertions
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ArrayAssert.isNotEmpty(this.data, "Array should not be empty.");
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ArrayAssert.contains(6, this.data, "Array should contain 6.");
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ArrayAssert.indexOf(6, this.data, 6, "The value in position 6 should be 6.");
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//check that all the values are there
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ArrayAssert.itemsAreEqual([0,1,2,3,4,5,6], this.data, "Arrays should be equal.");
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},
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/*
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* Test the pop() method.
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*/
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testPop : function() {
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//shortcut variables
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var Assert = YAHOO.util.Assert;
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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var value = this.data.pop();
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//array shouldn't be empty
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ArrayAssert.isNotEmpty(this.data, "Array should not be empty.");
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//basic equality assertion - expected value, actual value, optional error message
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Assert.areEqual(5, this.data.length, "Array should have 5 items.");
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Assert.areEqual(5, value, "Value should be 5.");
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ArrayAssert.itemsAreSame([0,1,2,3,4], this.data, "Arrays should be equal.");
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},
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/*
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* Test the reverse() method.
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*/
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testReverse : function() {
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//shortcut variables
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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this.data = this.data.reverse();
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ArrayAssert.itemsAreEqual([5,4,3,2,1,0], this.data, "Arrays should be equal.");
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},
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/*
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* Test the shift() method.
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*/
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testShift : function() {
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//shortcut variables
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var Assert = YAHOO.util.Assert;
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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var value = this.data.shift();
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//array shouldn't be empty
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ArrayAssert.isNotEmpty(this.data, "Array should not be empty.");
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//basic equality assertion - expected value, actual value, optional error message
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Assert.areEqual(5, this.data.length, "Array should have 6 items.");
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Assert.areEqual(0, value, "Value should be 0.");
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ArrayAssert.itemsAreEqual([1,2,3,4,5], this.data, "Arrays should be equal.");
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},
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/*
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* Test the splice() method.
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*/
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testSplice : function() {
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//shortcut variables
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var Assert = YAHOO.util.Assert;
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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var removed = this.data.splice(1, 2, 99, 100);
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//basic equality assertion - expected value, actual value, optional error message
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Assert.areEqual(6, this.data.length, "Array should have 6 items.");
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//the new items should be there
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ArrayAssert.indexOf(99, this.data, 1, "Value at index 1 should be 99.");
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ArrayAssert.indexOf(100, this.data, 2, "Value at index 2 should be 100.");
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ArrayAssert.itemsAreEqual([0,99,100,3,4,5], this.data, "Arrays should be equal.");
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ArrayAssert.itemsAreEqual([1,2], removed, "Removed values should be an array containing 1 and 2.");
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},
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/*
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* Test the unshift() method.
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*/
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testUnshift : function() {
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//shortcut variables
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var Assert = YAHOO.util.Assert;
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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this.data.unshift(-1);
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//basic equality assertion - expected value, actual value, optional error message
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Assert.areEqual(7, this.data.length, "Array should have 7 items.");
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//the new item should be there
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ArrayAssert.indexOf(-1, this.data, 0, "First item should be -1.");
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ArrayAssert.itemsAreEqual([-1,0,1,2,3,4,5], this.data, "Arrays should be equal.");
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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.ArrayTestCase);
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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">Array Assertions</h2>
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<p>This example uses the <a href="/yui/yuitest/#arrayassert"><code>ArrayAssert</code></a> object to test methods on JavaScript's
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built-in <code>Array</code> object. The intent of this example is to introduce <code>ArrayAssert</code> and its methods
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as an alternative to the generic methods available on <a href="/yui/yuitest/#assert"><code>Assert</code></a>.</p>
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<p>The example begins by creating an example namespace and <a href="/yui/yuitest/#testcase"><code>TestCase</code></a>:</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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YAHOO.example.yuitest.ArrayTestCase = new YAHOO.tool.TestCase({
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name: "Array Tests",
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//-------------------------------------------------------------------------
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// Setup and teardown
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|
//-------------------------------------------------------------------------
|
|
|
|
/*
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* The setUp() method is used to setup data that necessary for a test to
|
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* run. This method is called immediately before each test method is run,
|
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* so it is run as many times as there are test methods.
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*/
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setUp : function () {
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this.data = new Array (0,1,2,3,4,5);
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},
|
|
|
|
/*
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* The tearDown() method is used to clean up the initialization that was done
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* in the setUp() method. Ideally, it should free up all memory allocated in
|
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* setUp(), anticipating any possible changes to the data. This method is called
|
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* immediately after each test method is run.
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*/
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tearDown : function () {
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delete this.data;
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},
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...
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});
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</textarea>
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<p>This <code>TestCase</code> has a <code>setUp()</code> method that creates an array for all the tests to use, as well as
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a <code>tearDown()</code> method that deletes the array after each test has been executed. This array is used throughout
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the tests as a base for array manipulations.</p>
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<h3>Testing <code>push()</code></h3>
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<p>The first test is <code>testPush()</code>, which tests the functionality of the <code>Array</code> object's <code>push()</code> method
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(other methods hidden for simpicity):</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.example.yuitest.ArrayTestCase = new YAHOO.tool.TestCase({
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...
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testPush : function() {
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//shortcut variables
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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this.data.push(6);
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//array-specific assertions
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ArrayAssert.isNotEmpty(this.data, "Array should not be empty.");
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ArrayAssert.contains(6, this.data, "Array should contain 6.");
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ArrayAssert.indexOf(6, this.data, 6, "The value in position 6 should be 6.");
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//check that all the values are there
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ArrayAssert.itemsAreEqual([0,1,2,3,4,5,6], this.data, "Arrays should be equal.");
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},
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...
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});
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</textarea>
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<p>The test begins by setting up a shortcut variables for <code>ArrayAssert</code>, then pushes the value 6 onto
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the <code>data</code> array (which was created by <code>setUp()</code>). Next, <code>ArrayAssert.isNotEmpty()</code> determines if the
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array has at least one item; this should definitely pass because the <code>push()</code> operation only adds values to the array. To determine
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that the new value, 6, is in the array, <code>ArrayAssert.contains()</code> is used. The first argument is the value to look for and the second
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is the array to look in. To find out if the new value ended up where it should have (the last position, index 6), <code>ArrayAssert.indexOf()</code>
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is used, passing in the value to search for as the first argument, the array to search in as the second, and the index at which the value should
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occur as the final argument. Since 6 was pushed onto the end of an array that already had 6 items, it should end up at index 6 (the length of the
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array minus one). As a final test, <code>ArrayAssert.itemsAreEqual()</code> is used to determine that all of the items in the array are in the
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correct place. The first argument of this method is an array that has all of the values that should be in the array you're testing. This assertion
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passes only when the values in both arrays match up (the values are equal and the positions are the same).</p>
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<h3>Testing <code>pop()</code></h3>
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<p>The next test is <code>testPop()</code>, which tests the functionality of the <code>Array</code> object's <code>pop()</code> method:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.example.yuitest.ArrayTestCase = new YAHOO.tool.TestCase({
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...
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testPop : function() {
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//shortcut variables
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var Assert = YAHOO.util.Assert;
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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var value = this.data.pop();
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//array shouldn't be empty
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ArrayAssert.isNotEmpty(this.data, "Array should not be empty.");
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//basic equality assertion - expected value, actual value, optional error message
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Assert.areEqual(5, this.data.length, "Array should have 5 items.");
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Assert.areEqual(5, value, "Value should be 5.");
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ArrayAssert.itemsAreSame([0,1,2,3,4], this.data, "Arrays should be equal.");
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},
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...
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});
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</textarea>
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<p>This test also starts out by creating some shortcut variables, for <code>Assert</code> and <code>ArrayAssert</code>. Next, the <code>pop()</code>
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method is called, storing the returned item in <code>value</code>. Since <code>pop()</code> should only remove a single item, <code>ArrayAssert.isNotEmpty()</code>
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is called to ensure that only one item has been removed. After that, <code>Assert.areEqual()</code> is called twice: once to check the
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length of the array and once to confirm the value of the item that was removed from the array (which should be 5). The last assertion uses
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<code>ArrayAssert.itemsAreSame()</code>, which is similar to <code>ArrayAssert.itemsAreEqual()</code> in that it compares values between two
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arrays. The difference is that <code>ArrayAssert.itemsAreSame()</code> uses strict equality (<code>===</code>) to compare values, ensuring that
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no behind-the-scenes type conversions will occur (this makes <code>ArrayAssert.itemsAreSame()</code> more useful for working with arrays of
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objects).</p>
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<h3>Testing <code>reverse()</code></h3>
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<p>The next test is <code>testReverse()</code>, which tests the functionality of the <code>Array</code> object's <code>reverse()</code> method:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.example.yuitest.ArrayTestCase = new YAHOO.tool.TestCase({
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|
|
...
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testReverse : function() {
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//shortcut variables
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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this.data = this.data.reverse();
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ArrayAssert.itemsAreEqual([5,4,3,2,1,0], this.data, "Arrays should be equal.");
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},
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...
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});
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</textarea>
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<p>The <code>testRemove()</code> method is very simple, calling <code>reverse()</code> on the array and then testing the result. Since
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every item in the array has changed, the changes can be tested by calling <code>ArrayAssert.itemsAreEqual()</code> once (instead of
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calling <code>ArrayAssert.indexOf()</code> multiple times). The first argument is an array with all the values in the reverse order
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of the array that was created in <code>setUp()</code>. When compared with the second argument, the newly reversed array, the values in
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each position should be equal.</p>
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<h3>Testing <code>shift()</code></h3>
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<p>The next test is <code>testShift()</code>, which tests the functionality of the <code>Array</code> object's <code>shift()</code> method:</p>
|
|
|
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.example.yuitest.ArrayTestCase = new YAHOO.tool.TestCase({
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|
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...
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testShift : function() {
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//shortcut variables
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var Assert = YAHOO.util.Assert;
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
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var value = this.data.shift();
|
|
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//array shouldn't be empty
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ArrayAssert.isNotEmpty(this.data, "Array should not be empty.");
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|
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//basic equality assertion - expected value, actual value, optional error message
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Assert.areEqual(5, this.data.length, "Array should have 6 items.");
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Assert.areEqual(0, value, "Value should be 0.");
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ArrayAssert.itemsAreEqual([1,2,3,4,5], this.data, "Arrays should be equal.");
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},
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...
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});
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</textarea>
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<p>The <code>shift()</code> method removes the first item in the array and returns it (similar to <code>pop()</code>, which removes the item
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from the end). In the <code>testShift()</code> method, <code>shift()</code> is called and the item is stored in <code>value</code>. To ensure
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that the rest of the array is still there, <code>ArrayAssert.isNotEmpty()</code> is called. After that, <code>Array.areEqual()</code> is
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called twice, once to test the length of the array and once to test the value that was returned from <code>shift()</code> (which should be
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0). As a last test, the entire array is tested using <code>ArrayAssert.itemsAreEqual()</code> to ensure that all of the items have shifted
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into the appropriate positions in the array.</p>
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<h3>Testing <code>splice()</code></h3>
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<p>The next test is <code>testSplice()</code>, which tests the functionality of the <code>Array</code> object's <code>splice()</code> method:</p>
|
|
|
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<textarea name="code" class="JScript" cols="60" rows="1">
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|
YAHOO.example.yuitest.ArrayTestCase = new YAHOO.tool.TestCase({
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...
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testSplice : function() {
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//shortcut variables
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var Assert = YAHOO.util.Assert;
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var ArrayAssert = YAHOO.util.ArrayAssert;
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//do whatever data manipulation is necessary
|
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var removed = this.data.splice(1, 2, 99, 100);
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//basic equality assertion - expected value, actual value, optional error message
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Assert.areEqual(6, this.data.length, "Array should have 6 items.");
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//the new items should be there
|
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ArrayAssert.indexOf(99, this.data, 1, "Value at index 1 should be 99.");
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ArrayAssert.indexOf(100, this.data, 2, "Value at index 2 should be 100.");
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ArrayAssert.itemsAreEqual([0,99,100,3,4,5], this.data, "Arrays should be equal.");
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ArrayAssert.itemsAreEqual([1,2], removed, "Removed values should be an array containing 1 and 2.");
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},
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...
|
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});
|
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</textarea>
|
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<p>The <code>splice()</code> method is one of the most powerful <code>Array</code> manipulations. It can both remove and add any number of items
|
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from an array at the same time. This test begins by splicing some values into the array. When calling <code>splice()</code>, the first argument
|
|
is 1, indicating that values should be inserted at index 1 of the array; the second argument is 2, indicating that two values should be
|
|
removed from the array (the value in index 1 and the value in index 2); the third and fourth arguments are values that should be inserted
|
|
into the array at the position given by the first argument. Essentially, values 1 and 2 should end up being replaced by values 99 and 100 in
|
|
the array.</p>
|
|
<p>The first test is to determine that the length of the array is still 6 (since the previous step removed two items and then inserted two, the
|
|
length should still be 6). After that, <code>Assert.indexOf()</code> is called to determine that the values of 99 and 100 are in positions
|
|
1 and 2, respectively. To ensure the integrity of the entire array, <code>ArrayAssert.itemsAreEqual()</code> is called on the array, comparing
|
|
it to an array with the same values. The very last step is to test the value returned from <code>splice()</code>, which is an array containing
|
|
the removed values, 1 and 2. <code>ArrayAssert.itemsAreEqual()</code> is appropriate for this task as well.</p>
|
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|
|
<h3>Testing <code>unshift()</code></h3>
|
|
<p>The next test is <code>testUnshift()</code>, which tests the functionality of the <code>Array</code> object's <code>unshift()</code> method:</p>
|
|
|
|
<textarea name="code" class="JScript" cols="60" rows="1">
|
|
YAHOO.example.yuitest.ArrayTestCase = new YAHOO.tool.TestCase({
|
|
|
|
...
|
|
|
|
testUnshift : function() {
|
|
|
|
//shortcut variables
|
|
var Assert = YAHOO.util.Assert;
|
|
var ArrayAssert = YAHOO.util.ArrayAssert;
|
|
|
|
//do whatever data manipulation is necessary
|
|
this.data.unshift(-1);
|
|
|
|
//basic equality assertion - expected value, actual value, optional error message
|
|
Assert.areEqual(7, this.data.length, "Array should have 7 items.");
|
|
|
|
//the new item should be there
|
|
ArrayAssert.indexOf(-1, this.data, 0, "First item should be -1.");
|
|
|
|
ArrayAssert.itemsAreEqual([-1,0,1,2,3,4,5], this.data, "Arrays should be equal.");
|
|
|
|
},
|
|
|
|
...
|
|
});
|
|
</textarea>
|
|
<p>Working similar to <code>push()</code>, <code>unshift()</code> adds a value to the array, but the item is added to the front (index 0) instead of
|
|
the back. This test begins by adding the value -1 to the array. The first assertion determines if the length of the array has been incremented
|
|
to 7 to account for the new value. After that, <code>ArrayAssert.indexOf()</code> is used to determine if the value has been placed in the
|
|
correct location. The final assertions tests that the entire array is expected by using <code>ArrayAssert.itemsAreEqual()</code>.</p>
|
|
|
|
<h3>Running the tests</h3>
|
|
|
|
<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
|
|
completely loaded by using the Event utility's <code>onDOMReady()</code> method:</p>
|
|
|
|
<textarea name="code" class="JScript" cols="60" rows="1">
|
|
YAHOO.util.Event.onDOMReady(function (){
|
|
|
|
//create the logger
|
|
var logger = new YAHOO.tool.TestLogger();
|
|
|
|
//add the test suite to the runner's queue
|
|
YAHOO.tool.TestRunner.add(YAHOO.example.yuitest.ArrayTestCase);
|
|
|
|
//run the tests
|
|
YAHOO.tool.TestRunner.run();
|
|
});
|
|
</textarea>
|
|
|
|
<p>Before running the tests, it's necessary to create a <code>TestLogger</code> object to display the results (otherwise the tests would run
|
|
but you wouldn't see the results). After that, the <code>TestRunner</code> is loaded with the <code>TestSuite</code> object by calling
|
|
<code>add()</code> (any number of <code>TestCase</code> and <code>TestSuite</code> objects can be added to a <code>TestRunner</code>,
|
|
this example only adds one for simplicity). The very last step is to call <code>run()</code>, which begins executing the tests in its
|
|
queue and displays the results in the <code>TestLogger</code>.</p>
|
|
<h2>Configuration for This Example</h2>
|
|
|
|
<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&logger&yuitest&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
|
|
|
|
</div>
|
|
<div class="yui-u">
|
|
|
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|
|
<div id="examples">
|
|
<h3 class='firstContent'>YUI Test Utility Examples:</h3>
|
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|
|
<div id="exampleToc">
|
|
<ul>
|
|
<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 class='selected'><a href='../yuitest/yt-array-tests.html'>Array Processing</a></li><li><a href='../yuitest/yt-async-test.html'>Asynchronous Testing</a></li><li><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">
|
|
<h3>More YUI Test Utility Resources:</h3>
|
|
<ul>
|
|
<li><a href="http://developer.yahoo.com/yui/yuitest/">User's Guide</a> (external)</li>
|
|
<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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</div>
|
|
</div>
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</div>
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</div>
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</div>
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<div class="yui-b" id="tocWrapper">
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<!-- TABLE OF CONTENTS -->
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<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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Functional Examples" href="../../examples/imagecropper/index.html">ImageCropper</a></li><li class="item"><a title="The YUI ImageLoader Utility - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="item"><a title="The YUI JSON Utility - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="The YUI Layout Manager - Functional Examples" href="../../examples/layout/index.html">Layout Manager</a></li><li class="item"><a title="The YUI Logger Control - Functional Examples" href="../../examples/logger/index.html">Logger</a></li><li class="item"><a title="The YUI Menu Control - Functional Examples" href="../../examples/menu/index.html">Menu</a></li><li class="item"><a title="The YUI Paginator - Functional Examples" href="../../examples/paginator/index.html">Paginator</a></li><li class="item"><a title="The YUI Profiler Utility - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="The YUI ProfileViewer Control - Functional Examples" href="../../examples/profilerviewer/index.html">ProfilerViewer</a></li><li class="item"><a title="The YUI ProgressBar Control - Functional Examples" href="../../examples/progressbar/index.html">ProgressBar</a></li><li class="item"><a title="The YUI Resize Utility - Functional Examples" href="../../examples/resize/index.html">Resize</a></li><li class="item"><a title="The YUI Rich Text Editor - Functional Examples" href="../../examples/editor/index.html">Rich Text Editor</a></li><li class="item"><a title="The YUI Selector Utility - Functional Examples" href="../../examples/selector/index.html">Selector</a></li><li class="item"><a title="The YUI Slider Control - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="item"><a title="The YUI Storage Utility - Functional Examples" href="../../examples/storage/index.html">Storage</a></li><li class="item"><a title="The YUI SWF Utility - Functional Examples" href="../../examples/swf/index.html">SWF</a></li><li class="item"><a title="The YUI SWFStore Utility - Functional Examples" href="../../examples/swfstore/index.html">SWFStore</a></li><li class="item"><a title="The YUI Stylesheet Utility - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="item"><a title="The YUI TabView Control - Functional Examples" href="../../examples/tabview/index.html">TabView</a></li><li class="item"><a title="The YUI TreeView Control - Functional Examples" href="../../examples/treeview/index.html">TreeView</a></li><li class="item"><a title="The YUI Uploader Utility - Functional Examples" href="../../examples/uploader/index.html">Uploader (experimental)</a></li><li class="item"><a title="The YUI YAHOO Global Object - Functional Examples" href="../../examples/yahoo/index.html">YAHOO Global Object</a></li><li class="item"><a title="The YUI Loader Utility - Functional Examples" href="../../examples/yuiloader/index.html">YUI Loader</a></li><li class="selected "><a title="The YUI Test Utility - Functional Examples" href="../../examples/yuitest/index.html">YUI Test</a></li><li class="item"><a title="YUI Reset CSS - 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(external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
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