code: def test_emotion_single():
      out = emotion("I am really angry.")
      assert type(out) == str, "Output is not a string"
  
imports: from backprop import Emotion, ImageClassification, QA, Summarisation, TextClassification, TextGeneration, TextVectorisation
  import numpy
  import torch
  import os
label_desc: Use image node_id 11 for calling a global function with example usage: test_emotion_single() without return types