static void appendClientStates(final StringBuilder stringBuilder,
                                   final Map<ProcessId, ClientState> clientStates) {
        stringBuilder.append('{').append('\n');
        for (final Map.Entry<ProcessId, ClientState> entry : clientStates.entrySet()) {
            stringBuilder.append("  ").append(entry.getKey()).append(": ").append(entry.getValue()).append('\n');
        }
        stringBuilder.append('}').append('\n');
    }
Builds a ProcessId with a UUID by repeating the given number n. For valid n, it is guaranteed that the returned UUIDs satisfy
the same relation relative to others as their parameter n does: iff n < m, then uuidForInt(n) < uuidForInt(m)
streams/src/test/java/org/apache/kafka/streams/processor/internals/assignment/AssignmentTestUtils.java