Update tests to increase coverage

[kerbysoh]

• Updated tests for SetReminderWindowCommand, AddCompanyCommandParser and AddRoleCommandParser

[codecov-commenter]

Codecov Report

Merging #286 (74e6486) into master (4f6ce81) will increase coverage by 0.72%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #286      +/-   ##
============================================
+ Coverage     68.13%   68.86%   +0.72%     
- Complexity      694      705      +11     
============================================
  Files           107      107              
  Lines          2200     2200              
  Branches        258      258              
============================================
+ Hits           1499     1515      +16     
+ Misses          607      601       -6     
+ Partials         94       84      -10     

Impacted Files	Coverage Δ
...rc/main/java/seedu/tinner/model/role/RoleName.java	80.00% <0.00%> (ø)
src/main/java/seedu/tinner/model/ModelManager.java	79.54% <0.00%> (+2.27%)	:arrow_up:
...eedu/tinner/logic/parser/AddRoleCommandParser.java	96.29% <0.00%> (+22.22%)	:arrow_up:
...u/tinner/logic/parser/AddCompanyCommandParser.java	100.00% <0.00%> (+27.77%)	:arrow_up:
...inner/logic/commands/SetReminderWindowCommand.java	100.00% <0.00%> (+33.33%)	:arrow_up:

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