private void recordBefore(final int iteration) {
            history.append("Starting Iteration: ").append(iteration).append('\n');
            formatClientStates(false);
        }
Flip the cluster states from "assigned" to "subscribed" so they can be used for another round of assignments.
streams/src/test/java/org/apache/kafka/streams/processor/internals/assignment/TaskAssignorConvergenceTest.java