chore: Improve SSH unit tests

[minhtule]

Changes

TBD

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.39%. Comparing base (ae1a656) to head (5fcf05c).
⚠️ Report is 6 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #345      +/-   ##
==========================================
+ Coverage   86.07%   88.39%   +2.31%     
==========================================
  Files          40       39       -1     
  Lines        2830     2637     -193     
==========================================
- Hits         2436     2331     -105     
+ Misses        269      199      -70     
+ Partials      125      107      -18     

Flag	Coverage Δ
integration	57.36% <69.56%> (+2.50%)	⬆️
unit	81.91% <100.00%> (+3.36%)	⬆️

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	95.95% <100.00%> (+4.04%)	⬆️
internal/sshhandler/conn_pair.go	100.00% <100.00%> (+19.04%)	⬆️
internal/sshhandler/proxy.go	92.07% <100.00%> (+12.25%)	⬆️
internal/sshhandler/request_handler.go	87.77% <100.00%> (+6.82%)	⬆️

... and 4 files with indirect coverage changes

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