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}


def test_model_optional_str_missing():
    client = TestClient(app)
    response = client.post("/model-optional-str")
    assert response.status_code == 422, response.text
    assert response.json() == {
        "detail": [
            {

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