def test_install_host_required(self, capsys):
        with pytest.raises(SystemExit):
            self.parser.parse_args('install'.split())
        out, err = capsys.readouterr()
        assert err in "error: too few arguments"
dataset/ETHPy150Open ceph/ceph-deploy/ceph_deploy/tests/parser/test_install.py/TestParserInstall.test_install_host_required/swapped operands of `in`