code: def test_wordcloud_error_url():
      try:
          c = WordCloud().add(
              "",
              words,
              word_size_range=[20, 100],
              mask_image="error images_url",
          )
          c.render()
      except WordCloudMaskImageException as err:
          assert_equal(type(err), WordCloudMaskImageException)
          assert err.__str__() != ""
  
file_path: pyecharts/test/test_wordcloud.py
imports: from unittest.mock import patch
  from nose.tools import assert_equal, assert_in
  from pyecharts.charts import WordCloud
  from pyecharts.commons.utils import JsCode
  from pyecharts.exceptions import WordCloudMaskImageException
label_desc: Use image node_id 3 for calling a global function with example usage: test_wordcloud_error_url() without return types