NotifyStockTest.php

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<?php
namespace Magento\Catalog\Test\Unit\Block\Adminhtml\Rss;

use Magento\Framework\TestFramework\Unit\Helper\ObjectManager as ObjectManagerHelper;

class NotifyStockTest extends \PHPUnit\Framework\TestCase
{
    protected $block;

    protected $objectManagerHelper;

    protected $context;

    protected $rssModel;

    protected $rssUrlBuilder;

    protected $urlBuilder;

    protected $rssFeed = [
        'title' => 'Low Stock Products',
        'description' => 'Low Stock Products',
        'link' => 'http://magento.com/rss/feeds/index/type/notifystock',
        'charset' => 'UTF-8',
        'entries' => [
            [
                'title' => 'Low Stock Product',
                'description' => 'Low Stock Product has reached a quantity of 1.',
                'link' => 'http://magento.com/catalog/product/edit/id/1',

            ],
        ],
    ];

    protected function setUp()
    {
        $this->rssModel = $this->getMockBuilder(\Magento\Catalog\Model\Rss\Product\NotifyStock::class)
            ->setMethods(['getProductsCollection', '__wakeup'])
            ->disableOriginalConstructor()->getMock();
        $this->rssUrlBuilder = $this->createMock(\Magento\Framework\App\Rss\UrlBuilderInterface::class);
        $this->urlBuilder = $this->createMock(\Magento\Framework\UrlInterface::class);
        $this->objectManagerHelper = new ObjectManagerHelper($this);
        $this->block = $this->objectManagerHelper->getObject(
            \Magento\Catalog\Block\Adminhtml\Rss\NotifyStock::class,
            [
                'urlBuilder' => $this->urlBuilder,
                'rssModel' => $this->rssModel,
                'rssUrlBuilder' => $this->rssUrlBuilder
            ]
        );
    }

    public function testGetRssData()
    {
        $this->rssUrlBuilder->expects($this->once())->method('getUrl')
            ->will($this->returnValue('http://magento.com/rss/feeds/index/type/notifystock'));
        $item = $this->getMockBuilder(\Magento\Catalog\Model\Product::class)
            ->setMethods(['__sleep', '__wakeup', 'getId', 'getQty', 'getName'])
            ->disableOriginalConstructor()
            ->getMock();
        $item->expects($this->once())->method('getId')->will($this->returnValue(1));
        $item->expects($this->once())->method('getQty')->will($this->returnValue(1));
        $item->expects($this->any())->method('getName')->will($this->returnValue('Low Stock Product'));

        $this->rssModel->expects($this->once())->method('getProductsCollection')
            ->will($this->returnValue([$item]));
        $this->urlBuilder->expects($this->once())->method('getUrl')
            ->with('catalog/product/edit', ['id' => 1, '_secure' => true, '_nosecret' => true])
            ->will($this->returnValue('http://magento.com/catalog/product/edit/id/1'));
        $this->assertEquals($this->rssFeed, $this->block->getRssData());
    }

    public function testGetCacheLifetime()
    {
        $this->assertEquals(600, $this->block->getCacheLifetime());
    }

    public function testIsAllowed()
    {
        $this->assertTrue($this->block->isAllowed());
    }

    public function testGetFeeds()
    {
        $this->assertEmpty($this->block->getFeeds());
    }
}