LowstockTest.php

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<?php
namespace Magento\Reports\Test\Unit\Controller\Adminhtml\Report\Product;

use Magento\Reports\Controller\Adminhtml\Report\Product\Lowstock;
use Magento\Framework\DataObject;
use Magento\Framework\Phrase;

class LowstockTest extends \Magento\Reports\Test\Unit\Controller\Adminhtml\Report\AbstractControllerTest
{
    protected $lowstock;

    protected $dateMock;

    protected function setUp()
    {
        parent::setUp();

        $this->dateMock = $this->getMockBuilder(\Magento\Framework\Stdlib\DateTime\Filter\Date::class)
            ->disableOriginalConstructor()
            ->getMock();

        $objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $this->lowstock = $objectManager->getObject(
            \Magento\Reports\Controller\Adminhtml\Report\Product\Lowstock::class,
            [
                'context' => $this->contextMock,
                'fileFactory' => $this->fileFactoryMock,
                'dateFilter' => $this->dateMock,
            ]
        );
    }

    public function testExecute()
    {
        $titleMock = $this->getMockBuilder(\Magento\Framework\View\Page\Title::class)
            ->disableOriginalConstructor()
            ->getMock();

        $titleMock
            ->expects($this->once())
            ->method('prepend')
            ->with(new Phrase('Low Stock Report'));

        $this->viewMock
            ->expects($this->once())
            ->method('getPage')
            ->willReturn(
                new DataObject(
                    ['config' => new DataObject(
                        ['title' => $titleMock]
                    )]
                )
            );

        $this->menuBlockMock
            ->expects($this->once())
            ->method('setActive')
            ->with('Magento_Reports::report_products_lowstock');

        $this->breadcrumbsBlockMock
            ->expects($this->exactly(3))
            ->method('addLink')
            ->withConsecutive(
                [new Phrase('Reports'), new Phrase('Reports')],
                [new Phrase('Products'), new Phrase('Products')],
                [new Phrase('Low Stock'), new Phrase('Low Stock')]
            );

        $this->lowstock->execute();
    }
}