DriverPoolTest.php

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<?php
namespace Magento\Framework\Filesystem\Test\Unit;

use \Magento\Framework\Filesystem\DriverPool;

class DriverPoolTest extends \PHPUnit\Framework\TestCase
{
    public function testGetDriver()
    {
        $object = new DriverPool();
        foreach ([DriverPool::FILE, DriverPool::HTTP, DriverPool::HTTPS, DriverPool::ZLIB] as $code) {
            $this->assertInstanceOf(\Magento\Framework\Filesystem\DriverInterface::class, $object->getDriver($code));
        }
        $default = $object->getDriver('');
        $this->assertInstanceOf(\Magento\Framework\Filesystem\Driver\File::class, $default);
        $this->assertSame($default, $object->getDriver(''));
    }

    public function testCustomDriver()
    {
        $customOne = $this->getMockForAbstractClass(\Magento\Framework\Filesystem\DriverInterface::class);
        $customTwo = get_class($this->getMockForAbstractClass(\Magento\Framework\Filesystem\DriverInterface::class));
        $object = new DriverPool(['customOne' => $customOne, 'customTwo' => $customTwo]);
        $this->assertSame($customOne, $object->getDriver('customOne'));
        $this->assertInstanceOf(\Magento\Framework\Filesystem\DriverInterface::class, $object->getDriver('customOne'));
        $this->assertEquals($customTwo, get_class($object->getDriver('customTwo')));
        $this->assertInstanceOf(\Magento\Framework\Filesystem\DriverInterface::class, $object->getDriver('customTwo'));
    }

    public function testCustomDriverException()
    {
        new DriverPool(['custom' => new \StdClass()]);
    }
}