text: #  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 mock
  
  from nova.compute import power_state
  from nova import test
  from nova.tests.unit.virt.libvirt import fakelibvirt
  from nova.virt.libvirt import compat
  from nova.virt.libvirt import host
  
  
  class CompatTestCase(test.NoDBTestCase):
  
      def setUp(self):
          super(CompatTestCase, self).setUp()
          self.useFixture(fakelibvirt.FakeLibvirtFixture())
  
      @mock.patch.object(host.Host, 'has_min_version')
      def test_get_domain_info(self, mock_has_min_version):
          test_host = host.Host("qemu:///system")
          domain = mock.MagicMock()
          expected = [power_state.RUNNING, 512, 512, None, None]
          race = fakelibvirt.make_libvirtError(
              fakelibvirt.libvirtError,
              'ERR',
              error_code=fakelibvirt.VIR_ERR_OPERATION_FAILED,
              error_message='cannot read cputime for domain')
  
          mock_has_min_version.return_value = True
  
          domain.info.return_value = expected
          actual = compat.get_domain_info(fakelibvirt, test_host, domain)
          self.assertEqual(actual, expected)
          self.assertEqual(domain.info.call_count, 1)
          domain.info.reset_mock()
  
          domain.info.side_effect = race
          self.assertRaises(fakelibvirt.libvirtError,
                            compat.get_domain_info,
                            fakelibvirt, test_host, domain)
          self.assertEqual(domain.info.call_count, 1)
          domain.info.reset_mock()
  
          mock_has_min_version.return_value = False
  
          domain.info.side_effect = [race, expected]
          actual = compat.get_domain_info(fakelibvirt, test_host, domain)
          self.assertEqual(actual, expected)
          self.assertEqual(domain.info.call_count, 2)
          domain.info.reset_mock()
  
          domain.info.side_effect = race
          self.assertRaises(fakelibvirt.libvirtError,
                            compat.get_domain_info,
                            fakelibvirt, test_host, domain)
          self.assertEqual(domain.info.call_count, 2)
  