assert response.json() == {"x": None, "y": "y"}


def test_return_exclude_defaults():
    response = client.get("/exclude_defaults")
    assert response.json() == {}


def test_return_exclude_none():
    response = client.get("/exclude_none")
    assert response.json() == {"y": "y", "z": "z"}


def test_return_exclude_unset_none():
    response = client.get("/exclude_unset_none")