FlexUnit assertNotEquals

why is there an assertEquals and no assertNotEquals in FlexUnit ?
there may be a reasonable explanation, but anyway I needed it, so here it is in case someone searches for that

here is my AssertWithNotEquals.as :

package flexunit.framework
{
 public class AssertWithNotEquals extends Assert
 {
  public static function assertNotEquals(...rest):void
  {
   if ( rest.length == 3 ){
    failEquals( rest[0], rest[1], rest[2] );
   }else{
    failEquals( "", rest[0], rest[1] );
   }
  }
  
  private static function failEquals( message:String, expected:Object, actual:Object ):void
  {
   if ( expected == actual )
   {
    if ( message.length > 0 ) message = message + " - ";
    throw new AssertionFailedError( message + " expected not to be the same, but was <" + actual + ">" );
   }
  }
 }
}