Pr2/add ut servicemanager

[feng-j678]

[x] draft pr for testing servicemanager

[codecov]

Codecov Report

Attention: Patch coverage is 98.61111% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.27%. Comparing base (89b35c0) to head (b0b4424).

Files with missing lines	Patch %	Lines
src/core/tests/Test_ServiceManager.py	96.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   91.08%   91.27%   +0.18%     
==========================================
  Files          91       92       +1     
  Lines       15848    15913      +65     
==========================================
+ Hits        14435    14524      +89     
+ Misses       1413     1389      -24     

Flag	Coverage Δ
python27	91.27% <98.61%> (+0.18%)	⬆️
python39	91.27% <98.61%> (+0.18%)	⬆️

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