@app.post("/messages", response_model=Message)
async def create_message(input_message: str) -> Message:
    return Message(
        input=input_message,
        output=MessageOutput(body=f"Processed: {input_message}"),
    )


client = TestClient(app)


def test_create_message():
    response = client.post("/messages", params={"input_message": "Hello"})
    assert response.status_code == 200, response.text