code: def test_generate_image(self):
      self.module.generate_image(
          text_prompts=["戴眼镜的猫"],
          style="像素风格",
          topk=6,
          visualization=True,
          output_dir="ernievilg_output",
      )
  
imports: import shutil
  import unittest
  import paddlehub
label_desc: Use image node_id 3 for calling the TestHubModule obj's underlying member method code with example usage: obj.test_generate_image() without return types