tests: improve coverage for go/bytes2/buffer.go

[EshaanAgg]

Description

Improved the test coverage for go/bytes2/buffer.go to 100%

Related Issue(s)

Fixes part of #14931

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (737fdb3) 47.31% compared to head (49f5312) 47.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14958      +/-   ##
==========================================
- Coverage   47.31%   47.31%   -0.01%     
==========================================
  Files        1142     1142              
  Lines      239009   239009              
==========================================
- Hits       113091   113086       -5     
- Misses     117327   117331       +4     
- Partials     8591     8592       +1     

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[dbussink]

@EshaanAgg Can you resolve the conflict here and update it with latest main?

[EshaanAgg]

@dbussink Done!

[dbussink]

@EshaanAgg Sorry, I merged #14940 but I think the style here is better. Are you willing to merge in main and update the tests? We can then merge this one too.

[EshaanAgg]

@dbussink No worries! Merged main and updates the tests.