Support cross-source dependencies

Additional tests and docs in later patches.

Change-Id: I3b86a1e3dd507fa5e584680fb6c86d35f9ff3e23
Story: 2001334
Task: 5885
diff --git a/tests/unit/test_zuultrigger.py b/tests/unit/test_zuultrigger.py
index 3954a21..5575853 100644
--- a/tests/unit/test_zuultrigger.py
+++ b/tests/unit/test_zuultrigger.py
@@ -126,5 +126,5 @@
             "dependencies was unable to be automatically merged with the "
             "current state of its repository. Please rebase the change and "
             "upload a new patchset.")
-        self.assertEqual(self.fake_gerrit.queries[1],
-                         "project:org/project status:open")
+        self.assertIn("project:org/project status:open",
+                      self.fake_gerrit.queries)