emergency save.

test/test_single_boot.py

@@ -85,3 +85,15 @@ class BootUpTC(MTTClusterTC):
             ) as response:
                 self.assertIn(SESSION_KEY, response.cookies)
                 self.assertNotEqual(response.cookies[SESSION_KEY].value, value)
+
+    async def test_sessions_are_shared_between_servers(self):
+        """Does the session apply to the cluster."""
+        await self.create_cluster()
+        ids = []
+
+        def tests(response):
+            if SESSION_KEY in response.cookies:
+                ids.append(response.cookies[SESSION_KEY].value)
+
+        await self.run_tests("/", tests)
+        self.assertEqual(len(ids), 1, "Session info should be shared to the cluster.")