Flask Testing a put request with custom headers
You do need to actually encode the data to JSON:
import jsonwith app.test_client() as client: api_response = client.put(api, data=json.dumps(data), headers=headers)Setting data to a dictionary treats that as a regular form request, so each key-value pair would be encoded into application/x-www-form-urlencoded or multipart/form-data content, if you had used either content type. As it is, your data is entirely ignored instead.
I think it is simpler to just pass the data using the json parameter instead of the data parameter:
reponse = test_client.put( api, json=data,)Quoting from here:
Passing the json argument in the test client methods sets the request data to the JSON-serialized object and sets the content type to application/json.