All the rigamarole needed to test a Flex 4 skin

How to unit test Flex 4 skins

//AS3///////////////////////////////////////////////////////////////////////////
// 
// Copyright 2010 Kristofer Joseph.
// 
////////////////////////////////////////////////////////////////////////////////

package com.developsigner.view.skins
{
  import org.flexunit.Assert;
  import org.flexunit.async.Async;
  import org.fluint.uiImpersonation.UIImpersonator;
  import com.developsigner.view.components.Button;
  import com.developsigner.view.skins.DamButtonSkin;
  import mx.events.FlexEvent;
  import flash.utils.getQualifiedClassName;

  public class ButtonSkinTest
  {
    private var _button:Button;
    private var _buttonSkin:DamButtonSkin;

    [Before(async,ui)]
    public function setUp():void
    {
       _button = new Button();
       _buttonSkin = new DamButtonSkin();
       _button.setStyle("skinClass", Class(DamButtonSkin));
       Async.proceedOnEvent( this, _button, FlexEvent.CREATION_COMPLETE, 200 );
       UIImpersonator.addChild( _button );
    }

    [After]
    public function tearDown():void
    {
      UIImpersonator.removeChild( _button );
      _button     = null;
      _buttonSkin = null;
    }

    [BeforeClass]
    public static function setUpBeforeClass():void
    {
    }

    [AfterClass]
    public static function tearDownAfterClass():void
    {
    }

    [Test]
    public function shouldHaveMinHeight():void
    {
      Assert.assertEquals( 21, _buttonSkin.minHeight );
    }

    [Test]
    public function shouldHaveMinWidth():void
    {
      Assert.assertEquals( 110, _buttonSkin.minWidth );
    }

    [Test]
    public function shouldHaveCornerRadiusSet():void
    {
      _button.setStyle("cornerRadius", 5);
      Assert.assertEquals( "Should have correct corner radius", 5, _button.skin.getStyle("cornerRadius") );
    }
    
    [Test]
    public function shouldHaveCorrectSkinSet():void
    {
      Assert.assertEquals( "com.developsigner.view.skins::DamButtonSkin", getQualifiedClassName(_button.skin) );
    }
  }
}