public class TestExecute extends TestCase
{
   public static function getSuite() : TestSuite
   {
      var suite : TestSuite = new TestSuite();
      suite.addTest(new TestExecute("testGetString"));
      suite.addTest(new TestExecute("testExecuteNull"));
 
      return suite;
   }
 
   public override function setup() : void
   {
      CustomClass.setString("TestString");
   }
 
   public function testGetString() : void
   {
      // sample code to test
      Assert.assertEquals( CustomClass.getString(), "TestString");
   }
 
   public function testExecuteNull() : void
   {
      try
      {
         // sample code to test
         CustomClass.execute( null );
      }
      catch ( e:ArgumentError )
      {
         // exception thrown correctly
         return;
      }
      catch ( e:Error )
      {
         // exception thrown but of wrong type
         throw new AssertionFailedError("Invalid exception.");
      }
 
      // no exception was thrown
      throw new AssertionFailedError("Uncaught exception");
   }
}

[TestFixture]
public class TestExecute
{
   public static function getSuite() : TestSuite
   {
      var suite : TestSuite = new TestSuite();
      suite.add(TestExecute);
 
      return suite;
   }
 
   [SetUp]
   public function setup() : void
   {
      CustomClass.setString("TestString");
   }
 
   [Test]
   public function getString() : void
   {
      // sample code to test
      Assert.areEqual( CustomClass.getString(), "TestString");
   }
 
   [Test]
   [ExpectedError("ArgumentError")]
   public function executeNull() : void
   {
      // sample code to test
      CustomClass.execute( null );
   }
}