err = checkVersion(t, oldNs.Name(), previousVersion)
		if err != nil {
			t.Fatalf("found a pod in namespace (%s) with the previous version: %v", oldNs.Name(), err)
		}

		// now check traffic still works between the proxies
		sanitycheck.RunTrafficTestClientServer(t, oldClient, newServer)
	}
}

func checkVersion(t framework.TestContext, namespace, version string) error {