Adobe FlexプロジェクトでHelloWorldとUnitTest

HelloworldFlex.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
    				   xmlns:s="library://ns.adobe.com/flex/spark" 
					   xmlns:mx="library://ns.adobe.com/flex/mx">
<s:Button label="Hello World!!" click="clickButton()" />
<fx:Script>
	import mx.controls.Alert;
	
	public function clickButton():Boolean {
		Alert.show("Hello World!!");
		return true;
	}
</fx:Script>
</s:WindowedApplication>

HelloworldFlexTest.as

package flexUnitTests
{
    import flexunit.framework.Assert;
	
	public class HelloworldFlexTest
	{	
		var obj:HelloworldFlex;
		[Before]
		public function setUp():void
		{
			this.obj = new HelloworldFlex;
		}
		
		[After]
		public function tearDown():void
		{
		}
		
		[BeforeClass]
		public static function setUpBeforeClass():void
		{
		}
		
		[AfterClass]
		public static function tearDownAfterClass():void
		{
		}
		
		[Test]
		public function testClickButton():void
		{
			var result:Boolean;
			result = this.obj.clickButton();
			Assert.assertEquals(true, result);
		}
	}
}