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 heat.api.openstack.v1.views import views_common
  from heat.openstack.common.py3kcompat import urlutils
  from heat.tests.common import HeatTestCase
  
  
  class TestViewsCommon(HeatTestCase):
      def setUp(self):
          super(TestViewsCommon, self).setUp()
          self.request = mock.Mock()
          self.stack1 = {
              'id': 'id1',
          }
          self.stack2 = {
              'id': 'id2',
          }
  
      def setUpGetCollectionLinks(self):
          self.items = [self.stack1, self.stack2]
          self.request.params = {'limit': '2'}
          self.request.path_url = "http://example.com/fake/path"
  
      def test_get_collection_links_creates_next(self):
          self.setUpGetCollectionLinks()
          links = views_common.get_collection_links(self.request, self.items)
  
          expected = 'http://example.com/fake/path?marker=id2&limit=2'
          next_link = filter(lambda link: link['rel'] == 'next', links).pop()
          self.assertEqual('next', next_link['rel'])
          self.assertEqual(expected, next_link['href'])
  
      def test_get_collection_links_doesnt_create_next_if_no_limit(self):
          self.setUpGetCollectionLinks()
          del self.request.params['limit']
          links = views_common.get_collection_links(self.request, self.items)
  
          self.assertEqual([], links)
  
      def test_get_collection_links_doesnt_create_next_if_page_not_full(self):
          self.setUpGetCollectionLinks()
          self.request.params['limit'] = '10'
          links = views_common.get_collection_links(self.request, self.items)
  
          self.assertEqual([], links)
  
      def test_get_collection_links_overwrites_url_marker(self):
          self.setUpGetCollectionLinks()
          self.request.params = {'limit': '2', 'marker': 'some_marker'}
          links = views_common.get_collection_links(self.request, self.items)
  
          expected = 'http://example.com/fake/path?marker=id2&limit=2'
          next_link = filter(lambda link: link['rel'] == 'next', links).pop()
          self.assertEqual(expected, next_link['href'])
  
      def test_get_collection_links_does_not_overwrite_other_params(self):
          self.setUpGetCollectionLinks()
          self.request.params = {'limit': '2', 'foo': 'bar'}
          links = views_common.get_collection_links(self.request, self.items)
  
          next_link = filter(lambda link: link['rel'] == 'next', links).pop()
          url = next_link['href']
          query_string = urlutils.urlparse(url).query
          params = {}
          params.update(urlutils.parse_qsl(query_string))
          self.assertEqual('2', params['limit'])
          self.assertEqual('bar', params['foo'])
  
      def test_get_collection_links_handles_invalid_limits(self):
          self.setUpGetCollectionLinks()
          self.request.params = {'limit': 'foo'}
          links = views_common.get_collection_links(self.request, self.items)
          self.assertEqual([], links)
  
          self.request.params = {'limit': None}
          links = views_common.get_collection_links(self.request, self.items)
          self.assertEqual([], links)
  