PropertySiblingHolder example

protected function getSelfReferencingModel()
    {
        return new PropertyCircularReferenceDummy();
    }

    public function testSiblingReference()
    {
        $serializer = new Serializer([$this->normalizer]);
        $this->normalizer->setSerializer($serializer);

        $siblingHolder = new PropertySiblingHolder();

        $expected = [
            'sibling0' => ['coopTilleuls' => 'Les-Tilleuls.coop'],
            'sibling1' => ['coopTilleuls' => 'Les-Tilleuls.coop'],
            'sibling2' => ['coopTilleuls' => 'Les-Tilleuls.coop'],
        ];
        $this->assertEquals($expected, $this->normalizer->normalize($siblingHolder));
    }

    protected function getDenormalizerForConstructArguments(): PropertyNormalizer
    {