ConfigurationScannerTest.php

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<?php
namespace Magento\Setup\Test\Unit\Module\Di\Code\Scanner;

class ConfigurationScannerTest extends \PHPUnit\Framework\TestCase
{
    private $fileResolverMock;

    private $areaListMock;

    private $model;

    protected function setUp()
    {
        $this->fileResolverMock = $this->getMockBuilder(\Magento\Framework\App\Config\FileResolver::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->areaListMock = $this->getMockBuilder(\Magento\Framework\App\AreaList::class)
            ->disableOriginalConstructor()
            ->getMock();

        $objectManagerHelper = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $this->model = $objectManagerHelper->getObject(
            \Magento\Setup\Module\Di\Code\Scanner\ConfigurationScanner::class,
            [
                'fileResolver' => $this->fileResolverMock,
                'areaList' => $this->areaListMock,
            ]
        );
    }

    public function testScan()
    {
        $codes = ['code1', 'code2'];
        $iteratorMock = $this->getMockBuilder(\Magento\Framework\Config\FileIterator::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->areaListMock->expects($this->once())
            ->method('getCodes')
            ->willReturn($codes);
        $counts = count($codes) + 2;
        $this->fileResolverMock->expects($this->exactly($counts))
            ->method('get')
            ->willReturn($iteratorMock);
        $files = ['file1' => 'onefile', 'file2' => 'anotherfile'];
        $iteratorMock->expects($this->exactly($counts))
            ->method('toArray')
            ->willReturn($files);
        $this->assertEquals(array_keys($files), $this->model->scan('di.xml'));
    }
}