static Map<Subtopology, Set<TaskId>> getTasksForTopicGroup() {
        return mkMap(
            mkEntry(new Subtopology(0, null), mkSet(TASK_0_0, TASK_0_1, TASK_0_2, TASK_0_3, TASK_0_4, TASK_0_5, TASK_0_6)),
            mkEntry(new Subtopology(1, null), mkSet(TASK_1_0, TASK_1_1, TASK_1_2, TASK_1_3)),
            mkEntry(new Subtopology(2, null), mkSet(TASK_2_0, TASK_2_1, TASK_2_2, TASK_2_3)),
            mkEntry(new Subtopology(3, null), mkSet(TASK_3_0, TASK_3_1, TASK_3_2))
        );
    }
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