new_contents: #  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
  import os
  
  from oslo_config import cfg
  from paste import deploy
  
  from murano.common import app_loader
  from murano.common import config  # noqa
  from murano.tests.unit import base
  
  CONF = cfg.CONF
  
  
  class AppLoaderTest(base.MuranoTestCase):
      def setUp(self):
          super(AppLoaderTest, self).setUp()
          CONF.set_override('flavor', 'myflavor', 'paste_deploy')
          CONF.set_override('config_file', 'path/to/myapp-paste.ini',
                            'paste_deploy')
          CONF.config_file = ['myapp.conf']
          CONF.prog = 'myapp'
          CONF.find_file = mock.MagicMock(return_value='path/to/myapp-paste.ini')
  
      @mock.patch.object(deploy, 'loadapp', return_value=mock.sentinel.myapp)
      def _test_load_paste_app(self, mock_loadapp,
                               appname='myapp',
                               fullname='myapp-myflavor',
                               path='path/to/myapp-paste.ini'):
          expected_config_path = 'config:%s/%s' % (os.path.abspath('.'), path,)
  
          app = app_loader.load_paste_app(appname)
  
          mock_loadapp.assert_called_with(expected_config_path, name=fullname)
          self.assertEqual(mock.sentinel.myapp, app)
  
      def test_load_paste_app(self):
          self._test_load_paste_app()
  
      def test_load_paste_app_no_name(self):
          self._test_load_paste_app(appname=None)
  
      def test_load_paste_app_no_flavor(self):
          CONF.set_override('flavor', None, 'paste_deploy')
          self._test_load_paste_app(fullname='myapp')
  
      def test_load_paste_app_no_pastedep_cfg_opt(self):
          CONF.set_override('config_file', None, 'paste_deploy')
  
          self._test_load_paste_app()
  
      def test_load_paste_app_no_pastedep_cfg_opt_and_cfg_opt(self):
          CONF.set_override('config_file', None, 'paste_deploy')
          CONF.config_file = []
  
          self._test_load_paste_app()
          CONF.find_file.assert_called_with('myapp-paste.ini')
  
      def test_load_paste_app_no_cfg_at_all(self):
          CONF.set_override('config_file', None, 'paste_deploy')
          CONF.find_file.return_value = None
  
          self.assertRaises(RuntimeError, app_loader.load_paste_app, 'myapp')
  
      def test_load_paste_app_deploy_error(self):
          deploy.loadapp = mock.MagicMock()
          deploy.loadapp.side_effect = LookupError('Oops')
  
          self.assertRaises(RuntimeError, app_loader.load_paste_app, 'myapp')
  
subject: Increase unit test coverage for common.app_loader