test: add local 2x2 route topology

tests/test_syncthing.py

@@ -134,6 +134,24 @@ class SyncthingRouteManagerTests(unittest.TestCase):
         )
         self.assertEqual(json.loads(peer_ack.read_text())["nonce"], "peer-nonce")
 
+        local_nonce = configured.local_path / (
+            ".archive-control-route-nonce.cache-1"
+        )
+        before = (local_nonce.stat(), peer_ack.stat())
+        repeated = self.manager.verify(
+            configured,
+            self.spec,
+            "cache-1",
+            "local-nonce",
+            time.monotonic() + 1,
+        )
+        after = (local_nonce.stat(), peer_ack.stat())
+        self.assertEqual(repeated, (True, True))
+        self.assertEqual(
+            [(item.st_ino, item.st_mtime_ns) for item in before],
+            [(item.st_ino, item.st_mtime_ns) for item in after],
+        )
+
     def test_verification_times_out_without_peer_evidence(self):
         configured = self.manager.configure(self.spec, time.monotonic() + 1)
         with self.assertRaises(RouteSetupTimeout):