Add tests

[yuanxing-z]

No description provided.

[codecov-io]

Codecov Report

Merging #240 into master will increase coverage by 12.98%.
The diff coverage is 54.79%.

@@              Coverage Diff              @@
##             master     #240       +/-   ##
=============================================
+ Coverage     34.61%   47.59%   +12.98%     
- Complexity      410      480       +70     
=============================================
  Files           113      116        +3     
  Lines          2476     2557       +81     
  Branches        170      181       +11     
=============================================
+ Hits            857     1217      +360     
+ Misses         1552     1267      -285     
- Partials         67       73        +6     

Impacted Files	Coverage Δ	Complexity Δ
...java/seedu/address/logic/commands/EditCommand.java	76.36% <ø> (+76.36%)	7.00 <0.00> (+7.00)
...s/logic/commands/ListExpenseByCategoryCommand.java	100.00% <ø> (ø)	6.00 <0.00> (ø)
...dress/logic/commands/ListExpenseByDateCommand.java	100.00% <ø> (ø)	6.00 <0.00> (ø)
...dress/logic/commands/ListExpenseByDescCommand.java	100.00% <ø> (ø)	6.00 <0.00> (ø)
...u/address/logic/commands/ShowStatisticCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...du/address/logic/commands/SortByAmountCommand.java	27.77% <ø> (ø)	7.00 <0.00> (ø)
...du/address/logic/commands/ViewCategoryCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...gic/parser/ListExpenseByCategoryCommandParser.java	100.00% <ø> (+25.00%)	3.00 <0.00> (ø)
...s/logic/parser/ListExpenseByDateCommandParser.java	82.35% <ø> (+10.13%)	6.00 <0.00> (ø)
...s/logic/parser/ListExpenseByDescCommandParser.java	100.00% <ø> (+25.00%)	3.00 <0.00> (ø)
... and 49 more

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