Add GroupPersonCommand Test

[ZD292]

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[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (4fbceae) 60.49% compared to head (a3eb6fd) 62.03%.

❗ Current head a3eb6fd differs from pull request most recent head 8771563. Consider uploading reports for the commit 8771563 to get more accurate results

Additional details and impacted files

@@                Coverage Diff                @@
##             Branch-v1.4     #253      +/-   ##
=================================================
+ Coverage          60.49%   62.03%   +1.53%     
- Complexity           642      663      +21     
=================================================
  Files                116      116              
  Lines               2458     2460       +2     
  Branches             278      281       +3     
=================================================
+ Hits                1487     1526      +39     
+ Misses               863      824      -39     
- Partials             108      110       +2     

Files	Coverage Δ
...address/logic/parser/GroupPersonCommandParser.java	71.42% <ø> (+71.42%)	⬆️
...main/java/seedu/address/model/group/GroupList.java	72.34% <ø> (+8.34%)	⬆️
...edu/address/logic/commands/GroupPersonCommand.java	40.90% <0.00%> (+40.90%)	⬆️
...rc/main/java/seedu/address/model/ModelManager.java	40.47% <0.00%> (+1.95%)	⬆️

... and 5 files with indirect coverage changes

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