old_contents: #!/usr/bin/env python
  
  import argparse
  import collections
  import os
  import sys
  import unittest
  
  
  # Usage's syntax based on docopt.
  _USAGE = "%(prog)s [<name>...]"
  _DESCRIPTION = """\
  Runs the tests that have their name containing either one of the 'name'
  arguments passed. If no 'name' argument is passed, all the tests are run."""
  
  
  def _find_tests(path, selectors=None):
      if selectors is None:
          def filter(test):
              return True
      else:
          def filter(test):
              return any(selector in _get_test_full_name(test)
                         for selector in selectors)
  
      out = []
      if path == '__main__':
          root_test = unittest.TestLoader().loadTestsFromModule(sys.modules[path])
      else:
          root_test = unittest.TestLoader().discover(path)
  
      stack = collections.deque((root_test,))
      while stack:
          obj = stack.popleft()
          if isinstance(obj, unittest.TestSuite):
              stack.extend(test for test in obj)
          elif type(obj).__name__ == 'ModuleImportFailure':
              try:
                  # This should always throw an ImportError exception.
                  getattr(obj, _get_test_name(obj))()
              except ImportError as e:
                  sys.exit(e.message.strip())
          elif filter(obj):
              out.append(obj)
  
      return out
  
  
  def _get_test_name(test):
      return test._testMethodName
  
  
  def _get_test_full_name(test):
      return '%s.%s.%s' % (test.__class__.__module__, test.__class__.__name__,
                           _get_test_name(test))
  
  
  def run(start_path, verbosity=2):
      parser = argparse.ArgumentParser(usage=_USAGE, description=_DESCRIPTION)
      parser.add_argument('name', nargs='*',
                          help='partial test names to search')
      args = parser.parse_args()
      selectors = args.name if args.name else None
      tests = _find_tests(start_path, selectors)
      suite = unittest.TestLoader().suiteClass(tests)
      unittest.TextTestRunner(verbosity=verbosity).run(suite)
  
  
  if __name__ == "__main__":
      run(os.path.abspath(os.path.dirname(__file__)))
  
new_contents: #!/usr/bin/env python
  
  import argparse
  import collections
  import os
  import sys
  import unittest
  
  
  # Usage's syntax based on docopt.
  _USAGE = "%(prog)s [<name>...]"
  _DESCRIPTION = (
      "Runs the tests that have their name containing either one of the 'name' "
      "arguments passed. If no 'name' argument is passed, all the tests are run."
  )
  
  
  def _find_tests(path, selectors=None):
      if selectors is None:
          def filter(test):
              return True
      else:
          def filter(test):
              return any(selector in _get_test_full_name(test)
                         for selector in selectors)
  
      out = []
      if path == '__main__':
          root_test = unittest.TestLoader().loadTestsFromModule(sys.modules[path])
      else:
          root_test = unittest.TestLoader().discover(path)
  
      stack = collections.deque((root_test,))
      while stack:
          obj = stack.popleft()
          if isinstance(obj, unittest.TestSuite):
              stack.extend(test for test in obj)
          elif type(obj).__name__ == 'ModuleImportFailure':
              try:
                  # This should always throw an ImportError exception.
                  getattr(obj, _get_test_name(obj))()
              except ImportError as e:
                  sys.exit(e.message.strip())
          elif filter(obj):
              out.append(obj)
  
      return out
  
  
  def _get_test_name(test):
      return test._testMethodName
  
  
  def _get_test_full_name(test):
      return '%s.%s.%s' % (test.__class__.__module__, test.__class__.__name__,
                           _get_test_name(test))
  
  
  def run(start_path, verbosity=2):
      parser = argparse.ArgumentParser(usage=_USAGE, description=_DESCRIPTION)
      parser.add_argument('name', nargs='*',
                          help='partial test names to search')
      args = parser.parse_args()
      selectors = args.name if args.name else None
      tests = _find_tests(start_path, selectors)
      suite = unittest.TestLoader().suiteClass(tests)
      unittest.TextTestRunner(verbosity=verbosity).run(suite)
  
  
  if __name__ == "__main__":
      run(os.path.abspath(os.path.dirname(__file__)))
  
subject: Make the line continuation more readable