Add more tests

[fzyzcjy]

Changes

Please list issues fixed by this PR here, using format "Fixes #the-issue-number".

Checklist

• 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.

Remark for PR creator

• ./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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f655c8d) 99.24% compared to head (fff4f76) 99.25%.
Report is 53 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1657   +/-   ##
=======================================
  Coverage   99.24%   99.25%           
=======================================
  Files         345      345           
  Lines       14082    14082           
=======================================
+ Hits        13976    13977    +1     
+ Misses        106      105    -1     

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