adjust concurrent_basic2 test case

[al8n]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.41%. Comparing base (a102bac) to head (953d668).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
+ Coverage   70.82%   71.41%   +0.59%     
==========================================
  Files          28       28              
  Lines        2862     2862              
==========================================
+ Hits         2027     2044      +17     
+ Misses        835      818      -17     

see 3 files with indirect coverage changes

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