AppIsolation.php

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<?php
namespace Magento\TestFramework\Annotation;

class AppIsolation
{
    private $_hasNonIsolatedTests = true;

    private $_application;

    private $serverGlobalBackup;

    public function __construct(\Magento\TestFramework\Application $application)
    {
        $this->_application = $application;
    }

    protected function _isolateApp()
    {
        if ($this->_hasNonIsolatedTests) {
            $this->_application->reinitialize();
            $_SESSION = [];
            $_COOKIE = [];
            session_write_close();
            $this->_hasNonIsolatedTests = false;
        }
    }

    public function startTestSuite()
    {
        $this->serverGlobalBackup = $_SERVER;
        $this->_isolateApp();
    }

    public function endTestSuite()
    {
        $_SERVER = $this->serverGlobalBackup;
    }

    public function endTest(\PHPUnit\Framework\TestCase $test)
    {
        $this->_hasNonIsolatedTests = true;

        /* Determine an isolation from doc comment */
        $annotations = $test->getAnnotations();
        $annotations = array_replace((array) $annotations['class'], (array) $annotations['method']);
        if (isset($annotations['magentoAppIsolation'])) {
            $isolation = $annotations['magentoAppIsolation'];
            if ($isolation !== ['enabled'] && $isolation !== ['disabled']) {
                throw new \Magento\Framework\Exception\LocalizedException(
                    __('Invalid "@magentoAppIsolation" annotation, can be "enabled" or "disabled" only.')
                );
            }
            $isIsolationEnabled = $isolation === ['enabled'];
        } else {
            /* Controller tests should be isolated by default */
            $isIsolationEnabled = $test instanceof \Magento\TestFramework\TestCase\AbstractController;
        }

        if ($isIsolationEnabled) {
            $this->_isolateApp();
        }
    }
}