code: def test_copywriting_generation(self):
      results = self.module.copywriting_generation("芍药香氛的沐浴乳")
      self.assertIsInstance(results, str)
  
file_path: PaddleHub/modules/text/text_generation/ernie_zeus/test.py
imports: import unittest
  import paddlehub
label_desc: Use image node_id 5 for calling the TestHubModule obj's underlying member method code with example usage: obj.test_copywriting_generation() without return types