QUnit . skip ( 'performance/highcharts-chart' , ( assert ) => { const ROUNDS = 100 ; let totalCount = 0 , totalTime = 0 ; totalTime = ( new Date ( ) ) . getTime ( ) ; for ( var i = 0 , ie = ROUNDS ; i < ie ; ++ i ) { var chart = Highcharts . chart ( 'container' , { series : [ { type : 'column' , data : [ 5 , 6 , 7 ] } ] } ) ; assert . strictEqual ( chart . series [ 0 ] . data . length , 3 , 'Chart series length should be 3.' ) ; if ( ++ totalCount >= ROUNDS ) { totalTime = ( ( new Date ( ) ) . getTime ( ) - totalTime ) ; console . log ( 'performance/highcharts-chart: ' + totalCount + ' tests, ' + totalTime + 'ms' ) ; } } } ) ;