Added successful case for context pool, returns before timeout

[zhongdai]

I think we need an example of, if the tasks return before the context cancelled due to timeout, it should success

[codecov-commenter]

Codecov Report

Merging #94 (afc22ed) into main (7b8c8f2) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #94   +/-   ##
=======================================
  Coverage   99.30%   99.30%           
=======================================
  Files          12       12           
  Lines         429      429           
=======================================
  Hits          426      426           
  Misses          3        3           

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