ExportVarnishConfigTest.php

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<?php
namespace Magento\PageCache\Test\Unit\Controller\Adminhtml\PageCache;

use Magento\Framework\App\Filesystem\DirectoryList;

class ExportVarnishConfigTest extends \PHPUnit\Framework\TestCase
{
    protected $requestMock;

    protected $responseMock;

    protected $viewMock;

    protected $action;

    protected $fileFactoryMock;

    protected $configMock;

    protected function setUp()
    {
        $this->fileFactoryMock = $this->getMockBuilder(
            \Magento\Framework\App\Response\Http\FileFactory::class
        )->disableOriginalConstructor()->getMock();
        $this->configMock = $this->getMockBuilder(
            \Magento\PageCache\Model\Config::class
        )->disableOriginalConstructor()->getMock();
        $contextMock = $this->getMockBuilder(
            \Magento\Backend\App\Action\Context::class
        )->disableOriginalConstructor()->getMock();

        $this->requestMock = $this->getMockBuilder(
            \Magento\Framework\App\Request\Http::class
        )->disableOriginalConstructor()->getMock();
        $this->responseMock = $this->getMockBuilder(
            \Magento\Framework\App\Response\Http::class
        )->disableOriginalConstructor()->getMock();
        $this->viewMock = $this->getMockBuilder(
            \Magento\Framework\App\View::class
        )->disableOriginalConstructor()->getMock();

        $contextMock->expects($this->any())->method('getRequest')->will($this->returnValue($this->requestMock));
        $contextMock->expects($this->any())->method('getResponse')->will($this->returnValue($this->responseMock));
        $contextMock->expects($this->any())->method('getView')->will($this->returnValue($this->viewMock));

        $this->action = new \Magento\PageCache\Controller\Adminhtml\PageCache\ExportVarnishConfig(
            $contextMock,
            $this->fileFactoryMock,
            $this->configMock
        );
    }

    public function testExportVarnishConfigAction()
    {
        $fileContent = 'some conetnt';
        $filename = 'varnish.vcl';
        $responseMock = $this->getMockBuilder(
            \Magento\Framework\App\ResponseInterface::class
        )->disableOriginalConstructor()->getMock();

        $this->configMock->expects($this->once())->method('getVclFile')->will($this->returnValue($fileContent));
        $this->fileFactoryMock->expects(
            $this->once()
        )->method(
            'create'
        )->with(
            $this->equalTo($filename),
            $this->equalTo($fileContent),
            $this->equalTo(DirectoryList::VAR_DIR)
        )->will(
            $this->returnValue($responseMock)
        );

        $result = $this->action->execute();
        $this->assertInstanceOf(\Magento\Framework\App\ResponseInterface::class, $result);
    }
}