Update highcharts-tests.ts

highcharts/highcharts-tests.ts

@@ -23,10 +23,10 @@ var animate: HighchartsAnimation = {
 
 var gradient: HighchartsGradient = {
     linearGradient: {
-        x0: 0,
-        y0: 0,
-        x1: 500,
-        y1: 500
+        x1: 0,
+        y1: 0,
+        x2: 500,
+        y2: 500
     },
     stops: [
         [0, 'rgb(255, 255, 255)'],
@@ -136,4 +136,4 @@ var highChartSettings: HighchartsOptions = {
 
 var container = $("#container").highcharts(highChartSettings, (chart) => {
     chart.series[0].setVisible(true, true);
-});
+});