newsupernova/dev/tests/integration/testsuite/Magento/Backend/Block/Dashboard/GraphTest.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Backend\Block\Dashboard;

/**
 * @magentoAppArea adminhtml
 */
class GraphTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @var \Magento\Backend\Block\Dashboard\Graph
     */
    protected $_block;

    protected function setUp()
    {
        parent::setUp();
        $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
        /** @var \Magento\Framework\View\LayoutInterface $layout */
        $layout = $objectManager->get(\Magento\Framework\View\LayoutInterface::class);
        $this->_block = $layout->createBlock(\Magento\Backend\Block\Dashboard\Graph::class);
        $this->_block->setDataHelper($objectManager->get(\Magento\Backend\Helper\Dashboard\Order::class));
    }

    public function testGetChartUrl()
    {
        $this->assertStringStartsWith('http://chart.apis.google.com/chart', $this->_block->getChartUrl());
    }
}