Improving unit testing

[woojiahao]

• AddTransactionCommand
• AddTransactionCommandParser
• UniqueCategoryList
• TransactionList
• ParserUtil
• Prefix
• SampleDataUtil
• BudgetNotFoundException

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a918c57) 91.97% compared to head (7b0b596) 92.09%.
Report is 13 commits behind head on master.

❗ Current head 7b0b596 differs from pull request most recent head d0c100d. Consider uploading reports for the commit d0c100d to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #196      +/-   ##
============================================
+ Coverage     91.97%   92.09%   +0.11%     
- Complexity      939      942       +3     
============================================
  Files           104      104              
  Lines          2693     2693              
  Branches        236      236              
============================================
+ Hits           2477     2480       +3     
  Misses          161      161              
+ Partials         55       52       -3     

see 3 files with indirect coverage changes

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[lipwei1808]

Nice, thanks for the comprehensive tests!