SubmittedForm example

        $car = new \stdClass();
        $car->engine = new \stdClass();
        $engine = new \stdClass();
        $engine->brand = 'Rolls-Royce';
        $propertyPath = new PropertyPath('engine');

        $config = new FormConfigBuilder('name', \stdClass::class, $this->dispatcher);
        $config->setByReference(false);
        $config->setPropertyPath($propertyPath);
        $config->setData($engine);
        $form = new SubmittedForm($config);

        $this->mapper->mapFormsToData(new \ArrayIterator([$form]), $car);

        self::assertEquals($engine, $car->engine);
        self::assertNotSame($engine, $car->engine);
    }

    public function testMapFormsToDataWritesBackIfByReferenceButNoReference()
    {
        $car = new \stdClass();
        $car->engine = new \stdClass();