+ from collections import namedtuple

+     def get_diff_rpms_file(self, rpms_file_path, new_compose_path):

+         """

+         Diffs rpms from a new compose againts an rpms.json file

+         """

+         old_rm = productmd.Rpms()

+         old_rm.load(rpms_file_path)

+ 

+         new_rm = productmd.compose.Compose(new_compose_path).rpms

+ 

+         result = self._make_diff(old_rm, new_rm)

+ 

+         return result

+ 

+ 

+         result = self._make_diff(old_rm, new_rm)

+ 

+         return result

+ 

+     def _make_diff(self, old_rm, new_rm):

+         """ Creates a diff between two productmd Rpms objects. """

+         result = {}

+         result["old_compose"] = old_rm.compose.id

+         result["new_compose"] = new_rm.compose.id

+ 

+ def get_rpms_json_path(ident):

+     """Given a compose ID, return path to the rpms.json file of that compose."""

+     base = os.path.dirname(__file__)

+     pth = os.path.join(base, 'composes', ident, 'compose', 'metadata', 'rpms.json')

+     return pth

+ 

+ 

+ from .helpers import get_compose_path, get_rpms_json_path

+ 

+     def test_diff_with_rpms_json_file(self):

+         rpms_file_path = get_rpms_json_path("DP-1.0-20160315.t.0")

+         new_compose = get_compose_path("DP-1.0-20160315.t.1")

+         cdiff = diff.ComposeRpmsDiff()

+ 

+         data = cdiff.get_diff_rpms_file(rpms_file_path, new_compose)

+         self.maxDiff = None

+         self.assertEqual(data["diff"], EXPECTED_DIFF)