Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<div id="test" class="bar foo baz">test wrapper</div>
<script>
  Benchmark.prototype.setup = function() {
    var test = document.getElementById( 'test' ),
        $test = $( '#test' );
    
    var myHasClass = function( toTest, obj ) {
         return obj[0].className.match( new RegExp( '\\b' + toTest + '\\b', 'g' ) );
    };
  };
</script>

Preparation code output

Test runner

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$test.hasClass( 'foo' );

myHasClass( 'foo', $test);

test.className.match( /foo/ );

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