return {
            "value": req.value or None,
            "embedded_value": req.embedded_model.value or None,
        }

    client = TestClient(app)

    response = client.post("/", json={})
    assert response.status_code == 200, response.text
    assert response.json() == {
        "value": None,
        "embedded_value": None,
    }

    response2 = client.post(