update add command parser test

[Liu-2001]

No description provided.

[codecov-io]

Codecov Report

Merging #55 into v1.3 will increase coverage by 0.51%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               v1.3      #55      +/-   ##
============================================
+ Coverage     60.16%   60.68%   +0.51%     
- Complexity      513      518       +5     
============================================
  Files           100      100              
  Lines          1928     1928              
  Branches        197      197              
============================================
+ Hits           1160     1170      +10     
+ Misses          677      672       -5     
+ Partials         91       86       -5     

Impacted Files	Coverage Δ	Complexity Δ
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <100.00%> (+16.66%)	4.00 <0.00> (+1.00)
...in/java/seedu/address/model/exercise/Exercise.java	75.00% <100.00%> (ø)	12.00 <0.00> (ø)
...in/java/seedu/address/logic/parser/ParserUtil.java	93.75% <0.00%> (+12.50%)	24.00% <0.00%> (+4.00%)

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