add new test case assisted by copilot

[peter-wangxu]

Add tests to cover core scheduler logic

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 33.66%. Comparing base (2fce649) to head (819fbe6).
Report is 64 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
+ Coverage   32.01%   33.66%   +1.64%     
==========================================
  Files          41       41              
  Lines        6359     6426      +67     
==========================================
+ Hits         2036     2163     +127     
+ Misses       4035     3956      -79     
- Partials      288      307      +19     

Flag	Coverage Δ
unittests	33.66% <100.00%> (+1.64%)	⬆️

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