json-machine/test/JsonMachineTest/AutoloadingTest.php

<?php

declare(strict_types=1);

namespace JsonMachineTest;

/**
 * @covers \JsonMachine\Autoloading
 */
class AutoloadingTest extends \PHPUnit_Framework_TestCase
{
    /**
     * @runInSeparateProcess
     */
    public function testAutoloaderLoadsClass()
    {
        $dummyFile = $this->createAutoloadableClass();
        register_shutdown_function(function () use ($dummyFile) {
            @unlink($dummyFile);
        });

        $autoloadersBackup = $this->unregisterCurrentAutoloaders();
        $autoloader = require __DIR__.'/../../src/autoloader.php';

        spl_autoload_register($autoloader);
        $autoloaded = class_exists('JsonMachine\\AutoloadStub');
        spl_autoload_unregister($autoloader);

        $this->registerPreviousAutoloaders($autoloadersBackup);

        $this->assertTrue($autoloaded);
    }

    /**
     * @runInSeparateProcess
     */
    public function testIgnoresInvalidBaseNamespace()
    {
        $dummyFile = $this->createAutoloadableClass();
        register_shutdown_function(function () use ($dummyFile) {
            @unlink($dummyFile);
        });

        $autoloadersBackup = $this->unregisterCurrentAutoloaders();
        $autoloader = require __DIR__.'/../../src/autoloader.php';

        spl_autoload_register($autoloader);
        $autoloaded = class_exists('XXXsonMachine\\AutoloadStub');
        spl_autoload_unregister($autoloader);

        $this->registerPreviousAutoloaders($autoloadersBackup);

        $this->assertFalse($autoloaded);
    }

    public function testLoadsFilesInComposerJson()
    {
        $DIR = __DIR__;
        $phpCode = <<<PHP
            spl_autoload_register(require '$DIR' . '/../../src/autoloader.php');
            echo function_exists('toIterator') ? 'OK' : 'FAIL';
PHP;
        $cmd = 'php -r '.escapeshellarg($phpCode);
        $output = shell_exec($cmd);

        $this->assertStringContainsString('OK', $output);
    }

    private function createAutoloadableClass(): string
    {
        $dummyFile = __DIR__.'/../../src/AutoloadStub.php';
        file_put_contents($dummyFile, '<?php namespace JsonMachine; class AutoloadStub {}');

        return $dummyFile;
    }

    private function unregisterCurrentAutoloaders(): array
    {
        $autoloadersBackup = [];
        foreach (spl_autoload_functions() as $autoloader) {
            $autoloadersBackup[] = $autoloader;
            spl_autoload_unregister($autoloader);
        }

        return $autoloadersBackup;
    }

    private function registerPreviousAutoloaders(array $autoloadersBackup)
    {
        foreach ($autoloadersBackup as $restoreAutoloader) {
            spl_autoload_register($restoreAutoloader);
        }
    }
}