CssTest.php

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<?php
namespace Magento\Theme\Test\Unit\Block\Adminhtml\System\Design\Theme\Tab;

class CssTest extends \PHPUnit\Framework\TestCase
{
    protected $_model;

    protected $_objectManager;

    protected $urlBuilder;

    protected $urlCoder;

    protected function setUp()
    {
        $this->_objectManager = $this->createMock(\Magento\Framework\ObjectManagerInterface::class);
        $this->urlBuilder = $this->createMock(\Magento\Backend\Model\Url::class);
        $this->urlCoder = $this->createMock(\Magento\Framework\Encryption\UrlCoder::class);

        $objectManagerHelper = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $constructArguments = $objectManagerHelper->getConstructArguments(
            \Magento\Theme\Block\Adminhtml\System\Design\Theme\Edit\Tab\Css::class,
            [
                'formFactory' => $this->createMock(\Magento\Framework\Data\FormFactory::class),
                'objectManager' => $this->_objectManager,
                'uploaderService' => $this->createMock(\Magento\Theme\Model\Uploader\Service::class),
                'urlBuilder' => $this->urlBuilder,
                'urlCoder' => $this->urlCoder
            ]
        );

        $this->_model = $this->getMockBuilder(\Magento\Theme\Block\Adminhtml\System\Design\Theme\Edit\Tab\Css::class)
            ->setMethods(['_getCurrentTheme'])
            ->setConstructorArgs($constructArguments)
            ->getMock();
    }

    public function testGetUploadCssFileNote()
    {
        $method = self::getMethod('_getUploadCssFileNote');
        $sizeModel = $this->createMock(\Magento\Framework\File\Size::class);
        $sizeModel->expects($this->any())->method('getMaxFileSizeInMb')->willReturn('2M');

        $this->_objectManager->expects(
            $this->any()
        )->method(
            'get'
        )->with(
            \Magento\Framework\File\Size::class
        )->will(
            $this->returnValue($sizeModel)
        );

        $result = $method->invokeArgs($this->_model, []);
        $expectedResult = 'Allowed file types *.css.<br />';
        $expectedResult .= 'This file will replace the current custom.css file and can\'t be more than 2 MB.<br />';
        $expectedResult .= sprintf('Max file size to upload %sM', $sizeModel->getMaxFileSizeInMb());
        $this->assertEquals($expectedResult, $result);
    }

    public function testGetAdditionalElementTypes()
    {
        $method = self::getMethod('_getAdditionalElementTypes');

        $configModel = $this->createMock(\Magento\Framework\App\Config\ScopeConfigInterface::class);

        $this->_objectManager->expects(
            $this->any()
        )->method(
            'get'
        )->with(
            \Magento\Framework\App\Config\ScopeConfigInterface::class
        )->will(
            $this->returnValue($configModel)
        );

        $result = $method->invokeArgs($this->_model, []);
        $expectedResult = [
            'links' => \Magento\Theme\Block\Adminhtml\System\Design\Theme\Edit\Form\Element\Links::class,
            'css_file' => \Magento\Theme\Block\Adminhtml\System\Design\Theme\Edit\Form\Element\File::class,
        ];
        $this->assertEquals($expectedResult, $result);
    }

    public function testGetTabLabel()
    {
        $this->assertEquals('CSS Editor', $this->_model->getTabLabel());
    }

    protected static function getMethod($name)
    {
        $class = new \ReflectionClass(\Magento\Theme\Block\Adminhtml\System\Design\Theme\Edit\Tab\Css::class);
        $method = $class->getMethod($name);
        $method->setAccessible(true);
        return $method;
    }

    public function testGetterDownloadUrl()
    {
        $fileId = 1;
        $themeId = 1;
        $this->urlCoder->expects($this->atLeastOnce())->method('encode')->with($fileId)
            ->will($this->returnValue('encoded'));
        $this->urlBuilder->expects($this->atLeastOnce())->method('getUrl')
            ->with($this->anything(), ['theme_id' => $themeId, 'file' => 'encoded']);
        $this->_model->getDownloadUrl($fileId, $themeId);
    }
}