public function testUseUtc()
 {
     $globalOptions = HighchartGlobalOptions::getInstance();
     $globalOptions->useUTC = true;
     $this->assertEquals('{"useUTC":true}', $globalOptions->toJson());
     $globalOptions->setUseUTC(false);
     $this->assertEquals('{"useUTC":false}', $globalOptions->toJson());
 }
 public function registerGlobalOptions()
 {
     $globalOptions = HighchartGlobalOptions::getInstance();
     $js = "Highcharts.setOptions({$globalOptions});";
     $this->getView()->registerJs($js, View::POS_READY, __CLASS__);
 }