ComposerFactoryTest.php

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<?php
namespace Magento\Framework\Composer\Test\Unit;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Composer\ComposerFactory;
use Magento\Framework\Composer\ComposerJsonFinder;
use Magento\Framework\Filesystem\Driver\File;
use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;

class ComposerFactoryTest extends \PHPUnit\Framework\TestCase
{
    private $testComposerHome = __DIR__ . '/_files/composer_home';

    private $fixturesDir = __DIR__ . '/_files/';

    private $originalComposerHome;

    private $fileDriver;

    public function setUp()
    {
        $this->fileDriver = new File();
        $this->originalComposerHome = getenv('COMPOSER_HOME');
        putenv('COMPOSER_HOME');
    }

    public function tearDown()
    {
        if ($this->originalComposerHome) {
            putenv('COMPOSER_HOME=' . $this->originalComposerHome);
        }

        // Composer home directory is created one level up from where composer.json is.
        if (is_dir($this->testComposerHome)) {
            $this->fileDriver->deleteDirectory($this->testComposerHome);
        }
    }

    public function testCreate()
    {
        $objectManager = new ObjectManager($this);
        $dirListMock = $this->getMockBuilder(DirectoryList::class)->disableOriginalConstructor()->getMock();
        $composerJsonFinderMock = $this->getMockBuilder(ComposerJsonFinder::class)
            ->disableOriginalConstructor()
            ->getMock();

        $composerJsonPath = $this->fixturesDir . 'composer.json';

        $dirListMock->expects($this->once())
            ->method('getPath')
            ->willReturn($this->testComposerHome);
        $composerJsonFinderMock->expects($this->once())
            ->method('findComposerJson')
            ->willReturn($composerJsonPath);

        $factory = $objectManager->getObject(
            ComposerFactory::class,
            [
                'directoryList' => $dirListMock,
                'composerJsonFinder' => $composerJsonFinderMock
            ]
        );

        $this->assertInstanceOf(\Composer\Composer::class, $factory->create());
    }
}