ExportViewedExcelTest.php

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

use Magento\Reports\Controller\Adminhtml\Report\Product\ExportViewedExcel;

class ExportViewedExcelTest extends \Magento\Reports\Test\Unit\Controller\Adminhtml\Report\AbstractControllerTest
{
    protected $exportViewedExcel;

    protected $dateMock;

    protected $objectManagerMock;

    protected $helperMock;

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

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

        $this->helperMock = $this->getMockBuilder(\Magento\Backend\Helper\Data::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->objectManagerMock = $this->getMockBuilder(\Magento\Framework\ObjectManagerInterface::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->objectManagerMock
            ->expects($this->any())
            ->method('get')
            ->willReturn($this->helperMock);

        $this->contextMock->expects($this->any())->method('getObjectManager')->willReturn($this->objectManagerMock);

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

    public function testExecute()
    {
        $content = ['export'];
        $fileName = 'products_mostviewed.xml';

        $this->abstractBlockMock
            ->expects($this->once())
            ->method('getExcelFile')
            ->with($fileName)
            ->willReturn($content);

        $this->layoutMock
            ->expects($this->once())
            ->method('createBlock')
            ->with(\Magento\Reports\Block\Adminhtml\Product\Viewed\Grid::class)
            ->willReturn($this->abstractBlockMock);

        $this->fileFactoryMock
            ->expects($this->once())
            ->method('create')
            ->with($fileName, $content, \Magento\Framework\App\Filesystem\DirectoryList::VAR_DIR);

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