[PR] test(tools): pin the topic input defaulting rule [rocketmq-dashboard]

["zjncs (via GitHub)" <gi...@apache.org>]

zjncs opened a new pull request, #5743:
URL: https://github.com/apache/rocketmq-dashboard/pull/5743

   ### What
   
   `TopicInput` — the tool-side topic shape — had no test. This adds `TopicInputTest` with 5 tests.
   
   ### What is pinned
   
   - a fully specified input maps every field through `toTopicVO`;
   - **the defaulting rule**: a model that answers with only the topic name still produces a creatable topic — 8 write queues, 8 read queues, NORMAL type, RW permission;
   - **write and read queues default independently**: specifying one never silently changes the other;
   - `from()` maps every stored `TopicVO` field into the input;
   - the round trip through the VO preserves the explicit fields.
   
   ### Verification
   
   - New tests on unmodified code: **5/5 green**, checkstyle clean (`mvn test -Dtest=TopicInputTest`).
   - Discriminating mutations on `TopicInput`, build result verified red each time:
     1. the default queue count changed from 8 to 1 — red (two tests);
     2. the default permission downgraded from RW to RO, which would make every defaulted topic unwritable — red;
     3. the read-queue default collapsed to follow `writeQueues` — red (the independence test catches it).
   - Restored: 5/5 green. Test-only change; no product code touched.
   


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