Fixed write to closed channel in dispatcher

[korotin]

Dispatcher may panic with send on closed channel when pool is closing while new jobs are being added.

Write tries to send on bufferHasElements, which may be being closed in Close() at the same moment. To avoid that, I decided to never close bufferHasElements which may seem dirty, but should work fine since bufferHasElements will be removed by GC anyway.

I added test case to reproduce the issue as well.

[korotin]

Fixed failing tests.

Have no idea how i missed that(

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.32%. Comparing base (fc408b5) to head (05bba89).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/dispatcher/dispatcher.go	92.30%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
- Coverage   95.52%   95.32%   -0.21%     
==========================================
  Files          14       14              
  Lines         849      855       +6     
==========================================
+ Hits          811      815       +4     
- Misses         34       36       +2     
  Partials        4        4              

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[alitto]

Great catch @korotin, thank you! 🙌
Will ship it in a new patch version