code: def main(project_dir=None):
      runner = unittest.TextTestRunner(
          verbosity=1 + sys.argv.count("-v")
      )
      suite = all_tests_suite(project_dir=project_dir)
      raise SystemExit(not runner.run(suite).wasSuccessful())
  
file_path: catboost/contrib/python/simplejson/py3/simplejson/tests/__init__.py
imports: from __future__ import absolute_import
  import unittest
  import sys
  import os
label_desc: Use image node_id 3 for calling a global function with example usage: main(project_dir) without return types