new_contents: #!/usr/bin/env python
  
  """Gathers all tests in the /tests/ subdirectory and runs them."""
  import os
  import unittest
  
  
  def main():
    test_loader = unittest.TestLoader()
    tests_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'tests')
    test_suite = test_loader.discover(tests_dir, '*.py')
    test_runner = unittest.TextTestRunner()
    test_runner.run(test_suite)
  
  
  if __name__ == '__main__':
    main()
  
subject: Add a test runner that will execute all the tests in /tests/