test: add test for notificationService

[mortalYoung]

Descriptions

• add test for the notificationService
• improve notifications for testing

[codecov]

Codecov Report

Merging #346 (b09a960) into main (22597b4) will increase coverage by 0.72%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #346      +/-   ##
==========================================
+ Coverage   52.95%   53.67%   +0.72%     
==========================================
  Files         173      173              
  Lines        4604     4609       +5     
  Branches     1016     1016              
==========================================
+ Hits         2438     2474      +36     
+ Misses       2138     2110      -28     
+ Partials       28       25       -3     

Impacted Files	Coverage Δ
src/services/notificationService.ts	100.00% <100.00%> (+90.62%)	⬆️
src/common/utils.ts	84.61% <0.00%> (+3.84%)	⬆️

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[wewoor]

+1