AlternativeTest.php

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<?php
namespace Magento\Framework\View\Test\Unit\Design\FileResolution\Fallback\Resolver;

use \Magento\Framework\View\Design\FileResolution\Fallback\Resolver\Alternative;
use Magento\Framework\App\Filesystem\DirectoryList;

class AlternativeTest extends \PHPUnit\Framework\TestCase
{
    private $directory;

    private $rule;

    private $object;

    protected function setUp()
    {
        $this->directory = $this->createMock(\Magento\Framework\Filesystem\Directory\Read::class);
        $readFactory = $this->createMock(\Magento\Framework\Filesystem\Directory\ReadFactory::class);
        $readFactory->expects($this->any())
            ->method('create')
            ->will($this->returnValue($this->directory));
        $this->rule = $this->createMock(\Magento\Framework\View\Design\Fallback\Rule\RuleInterface::class);
        $rulePool = $this->createMock(\Magento\Framework\View\Design\Fallback\RulePool::class);
        $rulePool->expects($this->any())
            ->method('getRule')
            ->with('type')
            ->will($this->returnValue($this->rule));
        $this->object = new Alternative($readFactory, $rulePool, ['css' => ['less']]);
    }

    public function testConstructorException(array $alternativeExtensions)
    {
        $this->expectException('\InvalidArgumentException');
        $this->expectExceptionMessage("\$alternativeExtensions must be an array with format:"
            . " array('ext1' => array('ext1', 'ext2'), 'ext3' => array(...)]");

        $readFactory = $this->createMock(\Magento\Framework\Filesystem\Directory\ReadFactory::class);
        $rulePool = $this->createMock(\Magento\Framework\View\Design\Fallback\RulePool::class);
        new Alternative($readFactory, $rulePool, $alternativeExtensions);
    }

    public function constructorExceptionDataProvider()
    {
        return [
            'numerical keys'   => [['css', 'less']],
            'non-array values' => [['css' => 'less']],
        ];
    }

    public function testResolve()
    {
        $requestedFile = 'file.css';
        $expected = 'some/dir/file.less';

        $theme = $this->getMockForAbstractClass(\Magento\Framework\View\Design\ThemeInterface::class);
        $theme->expects($this->any())
            ->method('getFullPath')
            ->will($this->returnValue('magento_theme'));
        $this->rule->expects($this->atLeastOnce())
            ->method('getPatternDirs')
            ->will($this->returnValue(['some/dir']));

        $fileExistsMap = [
            ['file.css', false],
            ['file.less', true],
        ];
        $this->directory->expects($this->any())
            ->method('isExist')
            ->will($this->returnValueMap($fileExistsMap));

        $actual = $this->object->resolve('type', $requestedFile, 'frontend', $theme, 'en_US', 'Magento_Module');
        $this->assertSame($expected, $actual);
    }
}