diff --git a/kallithea/tests/vcs/test_hg.py b/kallithea/tests/vcs/test_hg.py
--- a/kallithea/tests/vcs/test_hg.py
+++ b/kallithea/tests/vcs/test_hg.py
@@ -584,3 +584,13 @@ class TestMercurialChangeset(object):
         assert 'Marcin Kuzminski' == self.repo.get_changeset('b986218ba1c9').author_name
         assert 'Lukasz Balcerzak' == self.repo.get_changeset('3803844fdbd3').author_name
         assert 'marcink' == self.repo.get_changeset('84478366594b').author_name
+
+    @pytest.mark.xfail
+    def test_successors(self):
+        init_chset = self.repo.get_changeset(0)
+        assert init_chset.successors == []
+
+    @pytest.mark.xfail
+    def test_predecessors(self):
+        init_chset = self.repo.get_changeset(0)
+        assert init_chset.predecessors == set([])