tests(internal/session): add more unit tests with smaller functions

[gyuho]

Signed-off-by: Gyuho Lee [email protected]

[codecov]

Codecov Report

Attention: Patch coverage is 81.69014% with 13 lines in your changes missing coverage. Please review.

Project coverage is 23.41%. Comparing base (f909795) to head (278c55d).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/session/session.go	81.69%	10 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #359   +/-   ##
=======================================
  Coverage   23.41%   23.41%           
=======================================
  Files         287      287           
  Lines       25695    25707   +12     
=======================================
+ Hits         6016     6020    +4     
- Misses      19074    19081    +7     
- Partials      605      606    +1     

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[eahydra]

lgtm, @cardyok PTAL

[cardyok]

lgtm