old_contents: # TODO: Test robustness, test speed
  import unittest, time, sys
  from common_conf import *
  from test_server import EchoServer, MessageServer
  import argparse
  import threading
  from test_server import TestMessageServer
  from test_client import TestClientWithDummyServer
  from test_commands import TestCommands
  from test_realistic_rendering import TestRealisticRendering
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      parser.add_argument('--travis', action='store_true') # Only run test availabe to travis CI
  
      args = parser.parse_args()
      suites = []
  
      load = unittest.TestLoader().loadTestsFromTestCase
      s = load(TestMessageServer); suites.append(s)
      s = load(TestClientWithDummyServer); suites.append(s)
      if not args.travis:
          s = load(TestCommands); suites.append(s)
          s = load(TestRealisticRendering); suites.append(s)
  
      suite_obj = unittest.TestSuite(suites)
      unittest.TextTestRunner(verbosity = 2).run(suite_obj)
  
new_contents: # TODO: Test robustness, test speed
  import unittest, time, sys
  from common_conf import *
  from test_server import EchoServer, MessageServer
  import argparse
  import threading
  from test_server import TestMessageServer
  from test_client import TestClientWithDummyServer
  from test_commands import TestCommands
  from test_realistic_rendering import TestRealisticRendering
  
  if __name__ == '__main__':
      parser = argparse.ArgumentParser()
      parser.add_argument('--travis', action='store_true') # Only run test availabe to travis CI
  
      args = parser.parse_args()
      suites = []
  
      load = unittest.TestLoader().loadTestsFromTestCase
      s = load(TestMessageServer); suites.append(s)
      s = load(TestClientWithDummyServer); suites.append(s)
      if not args.travis:
          s = load(TestCommands); suites.append(s)
          s = load(TestRealisticRendering); suites.append(s)
  
      suite_obj = unittest.TestSuite(suites)
      ret = not unittest.TextTestRunner(verbosity = 2).run(suite_obj).wasSucessful()
      sys.exit(ret)
  
subject: Fix exit code of unittest.