class_docstr: Fake CLI Config Class
class_docstr_tok: ["Fake","CLI","Config","Class"]
code: def clusters(self):
      return list(self.config["clusters"].keys())
  
file_path: streamalert/tests/unit/helpers/config.py
imports: import json
label_desc: Use image node_id 5 for calling the MockCLIConfig obj's underlying member method code with example usage: obj.clusters() and returns: list