feat: integrate confidential ballot provider evidence

tests/test_workspace.py

@@ -90,6 +90,9 @@ class VotingBallots:
             "id": ballot_id,
             "revision": 2,
             "state": "open",
+            "assurance_profile": "confidential",
+            "provider_id": "local_confidential",
+            "provider_ballot_ref": "local-confidential:ballot-1",
             "context": {"module": "committee", "resource_id": "vote-voting"},
         }
 
@@ -117,6 +120,13 @@ class VotingBallots:
             threshold_met=True,
             winning_options=("yes",),
             result_sha256="c" * 64,
+            evidence=(
+                {
+                    "kind": "reference_provider_result",
+                    "provider_id": "local_confidential",
+                    "certified": False,
+                },
+            ),
         )
 
     def certify_ballot(self, *args, **kwargs):
@@ -732,6 +742,11 @@ class CommitteeWorkspaceTests(unittest.TestCase):
         self.assertEqual("closed", closed.state)
         self.assertEqual({"yes": 2, "no": 1}, closed.attributes["counts"])
         self.assertEqual("c" * 64, closed.attributes["voting_result_sha256"])
+        self.assertEqual(
+            "confidential",
+            closed.attributes["voting_assurance_profile"],
+        )
+        self.assertFalse(closed.attributes["voting_provider_evidence"][0]["certified"])
         self.assertEqual("voting", closed.evidence[0].owner_module)
         self.assertNotIn("selections", closed.attributes)