def test_show_help_writes_to_stdout(self):
manager = ExecutionManager(stdout=io.StringIO(), stderr=io.StringIO())
manager.show_help()
self.assertGreater(len(manager.stdout.getvalue()), 0)
def test_execute_calls_show_help_if_argv_not_given(self):
manager = ExecutionManager(argv=['vcs'])
manager.show_help = mock.Mock()
manager.execute()
manager.show_help.assert_called_once_with()
