code: def test_format_tags():
      tags = ["tag_1", "tag_2", "tag_3"]
      assert format_tags(tags) == "[tag_1,tag_2,tag_3]"
  
file_path: H2O/h2o_hf/helm/src/helm/common/test_general.py
imports: import shutil
  import os
  from helm.common.general import ensure_file_downloaded, format_tags, flatten_list, format_split, get_file_name, unique_simplification
label_desc: Use image node_id 2 for calling a global function with example usage: test_format_tags() without return types