Add test cases that is left commented out

[JonathanHoshi]

Update the test cases of ModelManagerTest.java, UserPrefsTest.java

[codecov-commenter]

Codecov Report

Merging #284 (a99bed3) into master (34924f3) will increase coverage by 1.53%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #284      +/-   ##
============================================
+ Coverage     60.51%   62.04%   +1.53%     
- Complexity      462      476      +14     
============================================
  Files            89       88       -1     
  Lines          1712     1710       -2     
  Branches        194      194              
============================================
+ Hits           1036     1061      +25     
+ Misses          584      564      -20     
+ Partials         92       85       -7     

Impacted Files	Coverage Δ
src/main/java/seedu/trackermon/model/tag/Tag.java	80.00% <ø> (ø)
...model/show/exceptions/RatingNotValidException.java
...va/seedu/trackermon/model/show/UniqueShowList.java	92.68% <0.00%> (+2.43%)	:arrow_up:
...rc/main/java/seedu/trackermon/model/UserPrefs.java	75.00% <0.00%> (+3.12%)	:arrow_up:
src/main/java/seedu/trackermon/model/ShowList.java	91.66% <0.00%> (+4.16%)	:arrow_up:
...main/java/seedu/trackermon/model/ModelManager.java	98.36% <0.00%> (+24.59%)	:arrow_up:
...va/seedu/trackermon/model/util/SampleDataUtil.java	90.90% <0.00%> (+63.63%)	:arrow_up:

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