Add tests for JsonAdaptedConsultation

[chrisgzf]

This PR's base is Rishi's PR #172, somehow GitHub won't let me set his fork as base.

EDIT: Oh LMAO I realised why... I think for me to be able to set his fork as the base, I need to PR to his fork instead... #forkingworkflowsucks Nvm, let's wait for #172 to be merged, then this PR will sync up with master correctly. (Until that happens, don't review yet, cos the diff will be harder to read)

This PR adds tests for JsonAdaptedConsultation.

Closes #176, #175

[codecov-io]

Codecov Report

Merging #182 (37685c4) into master (7347818) will increase coverage by 2.38%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #182      +/-   ##
============================================
+ Coverage     69.87%   72.25%   +2.38%     
- Complexity      588      612      +24     
============================================
  Files           100      100              
  Lines          1932     1932              
  Branches        223      223              
============================================
+ Hits           1350     1396      +46     
+ Misses          484      443      -41     
+ Partials         98       93       -5     

Impacted Files	Coverage Δ	Complexity Δ
...ava/seedu/address/model/attendance/Attendance.java	73.91% <0.00%> (+13.04%)	9.00% <0.00%> (+2.00%)
src/main/java/seedu/address/model/UserPrefs.java	90.62% <0.00%> (+15.62%)	14.00% <0.00%> (+3.00%)
src/main/java/seedu/address/model/tag/Tag.java	100.00% <0.00%> (+20.00%)	8.00% <0.00%> (+3.00%)
...rc/main/java/seedu/address/logic/LogicManager.java	95.23% <0.00%> (+23.80%)	7.00% <0.00%> (+4.00%)
...seedu/address/storage/JsonAdaptedConsultation.java	95.00% <0.00%> (+77.50%)	12.00% <0.00%> (+10.00%)

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[kwannoel]

LGTM.