new_contents: from unittest import TestCase, mock
  
  from semantic_release import setup_hook
  
  
  class SetupPyHookTests(TestCase):
  
      @mock.patch('semantic_release.cli.main')
      def test_setup_hook_should_not_call_main_if_to_few_args(self, mock_main):
          setup_hook(['setup.py'])
          self.assertFalse(mock_main.called)
  
      @mock.patch('semantic_release.cli.main')
      def test_setup_hook_should_call_main(self, mock_main):
          setup_hook(['setup.py', 'publish'])
          self.assertTrue(mock_main.called)
  
subject: Add tests for the setup.py hook