Serialize properties

serialize_test.php

<?php

declare(strict_types=1);

use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
use Symfony\Component\Serializer\SerializerInterface;

class PropertiesTest extends KernelTestCase
{
    private SerializerInterface $serializer;

    protected function setUp(): void
    {
        parent::setUp();

        $this->serializer = self::getContainer()
            ->get(SerializerInterface::class);
    }

    /** @test */
    public function getting_unknown_property_throws(): void {

        $model = new MyModel();

        try
        {
            $value = $model->test;
            self::fail('Should have thrown!');

        } catch (Exception $exception)
        {
            self::assertTrue(true);
        }
    }

    /** @test */
    public function getting_known_property_should_pass(): void {

        $model = new MyModel();
        $model->value = 'test';

        $value = $model->value;

        self::assertSame('test', $value);
    }

    /** @test */
    public function serializing_should_succeed(): void {

        $model = new MyModel();
        $model->value = 'test';

        $json = $this->serializer->serialize($model, 'json');

        self::assertGreaterThan(0, strlen($json));
    }
}

class MyModel
{
    private array $values;

    public function __construct(array $values = []) {

        $this->values = $values;
    }

    public function __get(string $key)
    {
        return $this->values[$key];
    }

    public function __set(string $key, $value)
    {
        $this->values[$key] = $value;
    }
}