test: add unit test for 2248

Changes

Follow up for #2248

[ ] An issue to be fixed by this PR is listed above.
[ ] New tests are added to ensure new features are working. Please refer to this page to see how to add a test.
[ ] ./frb_internal precommit --mode slow (or fast) is run (it internal runs code generator, does auto formatting, etc).
[ ] If this PR adds/changes features, documentations (in the ./website folder) are updated.
[ ] CI is passing. Please refer to this page to see how to solve a failed CI.

./frb_internal --help shows utilities for development.
If fzyzcjy does not reply for a few days, maybe he just did not see it, so please ping him.