Added session to be part of state.

test/test_single_boot.py

@@ -74,3 +74,14 @@ class BootUpTC(MTTClusterTC):
         for _ in range(2):
             await self.run_tests("/", tests)
         self.assertEqual(len(ids), 1)
+
+    async def test_reset_bad_session_id(self):
+        """Does the session id get reset if bad or expired?"""
+        await self.create_server()
+        value = "bad id"
+        async with ClientSession() as session:
+            async with session.get(
+                f"{self.servers[0].host}/", cookies={SESSION_KEY: value}
+            ) as response:
+                self.assertIn(SESSION_KEY, response.cookies)
+                self.assertNotEqual(response.cookies[SESSION_KEY].value, value)