new_contents: #    Copyright (c) 2017 Mirantis, Inc.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  import ddt
  import six
  from tempest.lib import exceptions
  
  from ironicclient.tests.functional.osc.v1 import base
  
  
  @ddt.ddt
  class BaremetalNodeNegativeTests(base.TestCase):
      """Negative tests for baremetal node commands."""
  
      def setUp(self):
          super(BaremetalNodeNegativeTests, self).setUp()
          self.node = self.node_create()
  
      @staticmethod
      def constuct_cmd(base_cmd, argument, value):
          cmd = base_cmd
          if argument:
              cmd = '{} {} {}'.format(cmd, argument, value)
          return cmd
  
      @ddt.data(
          ('', '', 'error: argument --driver is required'),
          ('--driver', 'wrongdriver',
           'No valid host was found. Reason: No conductor service '
           'registered which supports driver wrongdriver.')
      )
      @ddt.unpack
      def test_create_driver(self, argument, value, ex_text):
          """Negative test for baremetal node driver options."""
          base_cmd = 'baremetal node create'
          command = self.constuct_cmd(base_cmd, argument, value)
          six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                                self.openstack, command)
  
      def test_delete_no_node(self):
          """Test for baremetal node delete without node specified."""
          command = 'baremetal node delete'
          ex_text = 'error: too few arguments'
          six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                                self.openstack, command)
  
      def test_list_wrong_argument(self):
          """Test for baremetal node list with wrong argument."""
          command = 'baremetal node list --wrong_arg'
          ex_text = 'error: unrecognized arguments: --wrong_arg'
          six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                                self.openstack, command)
  
      @ddt.data(
          ('--property', '', 'error: too few arguments'),
          ('--property', 'prop', 'Attributes must be a list of PATH=VALUE')
      )
      @ddt.unpack
      def test_set_property(self, argument, value, ex_text):
          """Negative test for baremetal node set command options."""
          base_cmd = 'baremetal node set'
          command = '{} {}'.format(
              self.constuct_cmd(base_cmd, argument, value), self.node['uuid'])
          six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                                self.openstack, command)
  
      @ddt.data(
          ('--property', '', 'error: too few arguments'),
          ('--property', 'prop', "Reason: can't remove non-existent object")
      )
      @ddt.unpack
      def test_unset_property(self, argument, value, ex_text):
          """Negative test for baremetal node unset command options."""
          base_cmd = 'baremetal node unset'
          command = '{} {}'.format(
              self.constuct_cmd(base_cmd, argument, value), self.node['uuid'])
          six.assertRaisesRegex(self, exceptions.CommandFailed, ex_text,
                                self.openstack, command)
  
subject: Add negative tests for baremetal node commands