/**
  * Prepare chart data
  *
  * @return void
  */
 protected function _prepareData()
 {
     $this->getDataHelper()->setParam('store', $this->getRequest()->getParam('store'));
     $this->getDataHelper()->setParam('website', $this->getRequest()->getParam('website'));
     $this->getDataHelper()->setParam('group', $this->getRequest()->getParam('group'));
     $this->setDataRows('revenue');
     $this->_axisMaps = ['x' => 'range', 'y' => 'revenue'];
     parent::_prepareData();
 }
 public function testGetChartUrl()
 {
     $this->assertStringStartsWith('http://chart.apis.google.com/chart', $this->_block->getChartUrl());
 }