Add Testing to Command Parser

[luciatirta]

No description provided.

[codecov-io]

Codecov Report

Merging #253 (09ca6a5) into master (ede8664) will increase coverage by 2.05%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #253      +/-   ##
============================================
+ Coverage     68.96%   71.02%   +2.05%     
- Complexity      930      964      +34     
============================================
  Files           130      130              
  Lines          3042     3044       +2     
  Branches        475      475              
============================================
+ Hits           2098     2162      +64     
+ Misses          727      679      -48     
+ Partials        217      203      -14     

Impacted Files	Coverage Δ	Complexity Δ
...ava/seedu/address/logic/commands/ClearCommand.java	80.00% <0.00%> (-20.00%)	3.00 <1.00> (+1.00)	⬇️
...java/seedu/address/logic/commands/SortCommand.java	100.00% <ø> (+66.66%)	1.00 <0.00> (ø)
...ddress/logic/commands/list/ListContactCommand.java	80.00% <0.00%> (-20.00%)	3.00 <1.00> (+1.00)	⬇️
.../address/logic/commands/list/ListEventCommand.java	85.71% <0.00%> (-14.29%)	3.00 <1.00> (+1.00)	⬇️
...u/address/logic/commands/list/ListTaskCommand.java	83.33% <0.00%> (-16.67%)	3.00 <1.00> (+1.00)	⬇️
...u/address/logic/commands/list/ListTodoCommand.java	85.71% <0.00%> (-14.29%)	3.00 <1.00> (+1.00)	⬇️
.../seedu/address/logic/parser/AddressBookParser.java	100.00% <ø> (+30.43%)	18.00 <0.00> (+6.00)
.../seedu/address/logic/parser/ListCommandParser.java	100.00% <ø> (+58.33%)	6.00 <0.00> (+3.00)
...in/java/seedu/address/logic/parser/ParserUtil.java	98.33% <0.00%> (+3.33%)	20.00% <0.00%> (+1.00%)
...edu/address/logic/parser/ContactTaskTagParser.java	90.00% <0.00%> (+10.00%)	3.00% <0.00%> (ø%)
... and 8 more

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[lerxcl]

Good job on improving code coverage!