chore: Improve SSH unit tests

[minhtule]

Changes

TBD

[codecov]

Codecov Report

❌ Patch coverage is 78.26087% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.02%. Comparing base (ae1a656) to head (e6137e8).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/sshhandler/request_handler.go	68.75%	4 Missing and 1 partial ⚠️
internal/sshhandler/conn_pair.go	76.47%	0 Missing and 4 partials ⚠️
internal/sshhandler/proxy.go	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #345      +/-   ##
==========================================
- Coverage   86.07%   86.02%   -0.05%     
==========================================
  Files          40       39       -1     
  Lines        2830     2641     -189     
==========================================
- Hits         2436     2272     -164     
+ Misses        269      240      -29     
- Partials      125      129       +4     

Flag	Coverage Δ
integration	57.28% <69.56%> (+2.42%)	⬆️
unit	79.40% <78.26%> (+0.85%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/sshhandler/channel_pair.go	91.91% <100.00%> (ø)
internal/sshhandler/proxy.go	75.72% <91.66%> (-4.10%)	⬇️
internal/sshhandler/conn_pair.go	73.33% <76.47%> (-7.62%)	⬇️
internal/sshhandler/request_handler.go	76.66% <68.75%> (-4.29%)	⬇️

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