use multi value in s meta key query

i want use multi value in s meta key in wordpress query
this is my query code

<?php  
                    $portfolio = new WP_Query(array(
                    'post_status' =>'publish',
                    'post_type' =>'post',
                    's' =>'test',
                    'posts_per_page' =>'2'      
                    ));
 if($portfolio->have_posts()) : 
                    while($portfolio->have_posts()) : $portfolio->the_post();?>

i want insert many value in s meta key like test,test2,test3
the below code is wrong but i dont know how fix this

's' =>'test','test2','test3'

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