ConcreteExtension example

namespace Symfony\Component\Form\Tests;

use PHPUnit\Framework\TestCase;
use Symfony\Component\Form\AbstractExtension;
use Symfony\Component\Form\FormTypeGuesserInterface;
use Symfony\Component\Form\Tests\Fixtures\FooType;

class AbstractExtensionTest extends TestCase
{
    public function testHasType()
    {
        $loader = new ConcreteExtension();
        $this->assertTrue($loader->hasType('Symfony\Component\Form\Tests\Fixtures\FooType'));
        $this->assertFalse($loader->hasType('foo'));
    }

    public function testGetType()
    {
        $loader = new ConcreteExtension();
        $this->assertInstanceOf(FooType::class, $loader->getType('Symfony\Component\Form\Tests\Fixtures\FooType'));
    }
}