jquery effects unit test, trying to accomplish what?
===

Reading jQuery 1.8 [test/unit/effects.js][1] test, what is it trying to test here?        

        var speeds = {
            'null speed' : null,
            'undefined speed': undefined,
            'false speed': false
        }

        // make sure passing bogus arguments doesn't change state var ?
        jQuery.each( speeds,
                     function( name, speed ) {
                         pass = true;
                         div.hide()
                             .show(speed)
                             .each( function() {
                                         if( this.style.display == 'none' ) {
                                             pass = false;
                                         }
                                  });
                             ok( pass, 'Show with ' + name );
                     });


  [1]: https://github.com/jquery/jquery/blob/master/test/unit/effects.js