Add in more test

[BILLXYR]

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[codecov-io]

Codecov Report

Merging #155 into master will increase coverage by 1.12%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #155      +/-   ##
============================================
+ Coverage     33.78%   34.91%   +1.12%     
- Complexity      264      273       +9     
============================================
  Files           100      100              
  Lines          1690     1690              
  Branches        148      148              
============================================
+ Hits            571      590      +19     
+ Misses         1064     1043      -21     
- Partials         55       57       +2     

Impacted Files	Coverage Δ	Complexity Δ
...s/logic/commands/ListExpenseByCategoryCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...dress/logic/commands/ListExpenseByDateCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...dress/logic/commands/ListExpenseByDescCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
.../java/seedu/address/model/ExpenseModelManager.java	27.63% <0.00%> (+2.63%)	9.00% <0.00%> (+1.00%)
...dress/logic/commands/DeleteDescriptionCommand.java	54.16% <0.00%> (+54.16%)	6.00% <0.00%> (+6.00%)
...ava/seedu/address/logic/commands/ClearCommand.java	100.00% <0.00%> (+100.00%)	2.00% <0.00%> (+2.00%)

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