GenerateRepositoryTest.php

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<?php
namespace Magento\Framework\ObjectManager\Test\Unit\Code\Generator;

use Composer\Autoload\ClassLoader;
use Magento\Framework\Code\Generator\Io;
use Magento\Framework\ObjectManager\Code\Generator\Repository;
use \PHPUnit_Framework_MockObject_MockObject as MockObject;

class GenerateRepositoryTest extends \PHPUnit\Framework\TestCase
{
    private $ioGenerator;

    protected function setUp()
    {
        $this->ioGenerator = $this->getMockBuilder(Io::class)
            ->disableOriginalConstructor()
            ->getMock();

        $loader = new ClassLoader();
        $loader->addPsr4(
            'Magento\\Framework\\ObjectManager\\Code\\Generator\\',
            __DIR__ . '/_files'
        );
        $loader->register();
    }

    public function testGenerate($className, $sourceClassName, $fileName)
    {
        $repository = $this->getMockBuilder(Repository::class)
            ->setMethods(['_validateData'])
            ->setConstructorArgs([
                $sourceClassName,
                null,
                $this->ioGenerator
            ])
            ->getMock();

        $this->ioGenerator
            ->method('generateResultFileName')
            ->with('\\' . $className)
            ->willReturn($fileName . '.php');

        $repositoryCode = file_get_contents(__DIR__ . '/_files/' . $fileName . '.txt');
        $this->ioGenerator->method('writeResultFile')
            ->with($fileName . '.php', $repositoryCode);

        $repository->method('_validateData')
            ->willReturn(true);
        $generated = $repository->generate();

        $this->assertEquals($fileName . '.php', $generated, 'Generated repository is invalid.');
    }

    public function interfaceListDataProvider()
    {
        return [
            [
                \Magento\Framework\ObjectManager\Code\Generator\SampleRepository::class,
                \Magento\Framework\ObjectManager\Code\Generator\Sample::class,
                'SampleRepository'
            ],
            [
                \Magento\Framework\ObjectManager\Code\Generator\TSampleRepository::class,
                \Magento\Framework\ObjectManager\Code\Generator\TSample::class,
                'TSampleRepository'
            ],
        ];
    }

    public function testValidateData()
    {
        $sourceClassName = 'Magento_Module_Controller_Index';
        $resultClassName = 'Magento_Module_Controller';

        $repository = new Repository();
        $repository->init($sourceClassName, $resultClassName);
        $this->assertFalse($repository->generate());
    }
}