Add test for hairdresser and print

[zyifanz]

Close #273

[codecov-io]

Codecov Report

Merging #278 (22f78d2) into master (8d787c8) will increase coverage by 10.31%.
The diff coverage is 76.92%.

@@              Coverage Diff              @@
##             master     #278       +/-   ##
=============================================
+ Coverage     37.73%   48.05%   +10.31%     
- Complexity      493      606      +113     
=============================================
  Files           149      149               
  Lines          2862     2878       +16     
  Branches        323      326        +3     
=============================================
+ Hits           1080     1383      +303     
+ Misses         1715     1402      -313     
- Partials         67       93       +26     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/seedu/address/model/IdCounter.java	86.66% <55.55%> (-13.34%)	15.00 <3.00> (+3.00)	⬇️
src/main/java/seedu/address/model/UserPrefs.java	80.55% <83.33%> (+3.88%)	11.00 <3.00> (+2.00)
...ava/seedu/address/logic/commands/PrintCommand.java	83.17% <100.00%> (+83.17%)	21.00 <3.00> (+21.00)
...c/main/java/seedu/address/model/person/Person.java	70.27% <0.00%> (+2.70%)	12.00% <0.00%> (+1.00%)
...ain/java/seedu/address/model/UniqueEntityList.java	90.69% <0.00%> (+4.65%)	20.00% <0.00%> (+1.00%)
...u/address/model/specialisation/Specialisation.java	53.84% <0.00%> (+7.69%)	12.00% <0.00%> (+3.00%)
...c/main/java/seedu/address/model/person/Gender.java	72.72% <0.00%> (+9.09%)	9.00% <0.00%> (+2.00%)
...dress/model/appointment/UniqueAppointmentList.java	16.27% <0.00%> (+9.30%)	4.00% <0.00%> (+2.00%)
src/main/java/seedu/address/model/tag/Tag.java	80.00% <0.00%> (+10.00%)	4.00% <0.00%> (+1.00%)
...ava/seedu/address/model/person/client/Address.java	70.00% <0.00%> (+10.00%)	5.00% <0.00%> (+1.00%)
... and 21 more

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