add send byte data test

[szpnygo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #14 (4e29ff4) into main (3babbfb) will increase coverage by 1.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   65.40%   66.79%   +1.38%     
==========================================
  Files          55       55              
  Lines        2567     2569       +2     
==========================================
+ Hits         1679     1716      +37     
+ Misses        746      713      -33     
+ Partials      142      140       -2     

Impacted Files	Coverage Δ
session/session.go	77.50% <100.00%> (+1.18%)	⬆️
agent/agent.go	54.19% <0.00%> (+6.10%)	⬆️
app.go	90.32% <0.00%> (+11.82%)	⬆️
session/pool.go	88.57% <0.00%> (+15.23%)	⬆️