old_contents: # coding=utf-8
  import os
  from unittest import main
  
  from _jb_runner_tools import jb_start_tests, jb_doc_args
  from teamcity import unittestpy
  
  if __name__ == '__main__':
      path, targets, additional_args = jb_start_tests()
  
      args = ["python -m unittest"]
      if path:
          discovery_args = ["discover", "-s"]
          # Unittest does not support script directly, but it can use "discover" to find all tests in some folder
          # filtering by script
          assert os.path.exists(path), "{0}: No such file or directory".format(path)
          if os.path.isfile(path):
              discovery_args += [os.path.dirname(path), "-p", os.path.basename(path)]
          else:
              discovery_args.append(path)
          additional_args = discovery_args + additional_args
      else:
          additional_args += targets
      args += additional_args
      jb_doc_args("unittests", args)
      main(argv=args, module=None, testRunner=unittestpy.TeamcityTestRunner())
  
new_contents: # coding=utf-8
  import os
  from unittest import main
  
  from _jb_runner_tools import jb_start_tests, jb_doc_args
  from teamcity import unittestpy
  
  if __name__ == '__main__':
      path, targets, additional_args = jb_start_tests()
  
      args = ["python -m unittest"]
      if path:
          discovery_args = ["discover", "-s"]
          # Unittest does not support script directly, but it can use "discover" to find all tests in some folder
          # filtering by script
          assert os.path.exists(path), "{0}: No such file or directory".format(path)
          if os.path.isfile(path):
              discovery_args += [os.path.dirname(path), "-p", os.path.basename(path)]
          else:
              discovery_args.append(path)
          additional_args = discovery_args + additional_args
      elif targets:
          additional_args += targets
      args += additional_args
      jb_doc_args("unittests", args)
      main(argv=args, module=None, testRunner=unittestpy.TeamcityTestRunner())
  
subject: Check variable before accessing it