Add test cases for AddVisitParser, EditVisitParser and DeleteVisitParser

[eugene3231]

No description provided.

[codecov]

Codecov Report

Merging #166 into patient-profile-window-update will increase coverage by 1.84%.
The diff coverage is 100.00%.

@@                         Coverage Diff                         @@
##             patient-profile-window-update     #166      +/-   ##
===================================================================
+ Coverage                            62.95%   64.79%   +1.84%     
- Complexity                             635      646      +11     
===================================================================
  Files                                  102      102              
  Lines                                 2386     2386              
  Branches                               253      253              
===================================================================
+ Hits                                  1502     1546      +44     
+ Misses                                 795      754      -41     
+ Partials                                89       86       -3     

Impacted Files	Coverage Δ	Complexity Δ
...edu/address/logic/commands/DeleteVisitCommand.java	56.75% <100.00%> (ø)	7.00 <1.00> (ø)
...address/logic/parser/DeleteVisitCommandParser.java	100.00% <100.00%> (+100.00%)	2.00 <0.00> (+2.00)
...in/java/seedu/address/logic/parser/ParserUtil.java	98.52% <0.00%> (+8.82%)	28.00% <0.00%> (+3.00%)
...edu/address/logic/parser/ProfileCommandParser.java	100.00% <0.00%> (+100.00%)	2.00% <0.00%> (+2.00%)
...du/address/logic/parser/AddVisitCommandParser.java	100.00% <0.00%> (+100.00%)	2.00% <0.00%> (+2.00%)
...u/address/logic/parser/EditVisitCommandParser.java	100.00% <0.00%> (+100.00%)	2.00% <0.00%> (+2.00%)

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