WorkingDirectoryTest.php

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<?php
namespace Magento\Test\Isolation;

class WorkingDirectoryTest extends \PHPUnit\Framework\TestCase
{
    protected $_object;

    protected function setUp()
    {
        $this->_object = new \Magento\TestFramework\Isolation\WorkingDirectory();
    }

    protected function tearDown()
    {
        $this->_object = null;
    }

    public function testStartTestEndTest()
    {
        $oldWorkingDir = getcwd();
        $newWorkingDir = __DIR__;
        if ($oldWorkingDir == $newWorkingDir) {
            $this->markTestSkipped("Test requires the current working directory to differ from '{$oldWorkingDir}'.");
        }
        $this->_object->startTest($this);
        chdir($newWorkingDir);
        $this->assertEquals($newWorkingDir, getcwd(), 'Unable to change the current working directory.');
        $this->_object->endTest($this);
        $this->assertEquals($oldWorkingDir, getcwd(), 'Current working directory was not restored.');
    }
}