Function actix_web::test::try_call_and_read_body_json

pub async fn try_call_and_read_body_json<S, B, T>(
    app: &S,
    req: Request
) -> Result<T, Box<dyn StdError>>where
    S: Service<Request, Response = ServiceResponse<B>, Error = Error>,
    B: MessageBody,
    T: DeserializeOwned,

Fallible version of call_and_read_body_json that allows testing service call errors.