"anyOf": [{"type": "string"}, {"type": "null"}],
                "title": "P",
            },
        },
        "title": body_model_name,
        "type": "object",
    }


def test_optional_str_missing():
    client = TestClient(app)
    response = client.post("/optional-str")
    assert response.status_code == 200, response.text
    assert response.json() == {"p": None}