static Map<Subtopology, Set<TaskId>> getTopologyGroupTaskMap() {
        return Collections.singletonMap(SUBTOPOLOGY_0, Collections.singleton(new TaskId(1, 1)));
    }
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