[Python] Create tests to cover cases where the response from the third-party API is not the...

I have an API on Flask (Python) that interacts with a third-party API, for example, creating documents.
My code:

def my_function(data):
response = requests.post("https://some_api.com", json=data)
json_response = response.json()
if json_response["message"] == "Successfully created":
return "Successfully created"
elif json_response["message"] == "Already exists":
return "Already exists"
elif json_response["message"] == "Wrong data":
return "Wrong data"
else:
return json_response["message"]


I have already created tests to cover cases where the third-party API works as expected(where "message" equals to "Successfully created", "Already exists" or "Wrong data").
However, I also want to cover case where the third-party API does not work as expected. I want to create a test that covers the 'else' branch, but I cannot reach it while the third-party API is working properly.
Is there a way to obtain a response that the third-party API would not normally provide?
Can anyone suggest how I can achieve this?

Thank you in advance.

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