Test : JUnit testing for gradetracker

[murtubak]

fixes #625
Added testing for gradetracker commands and parsers.
Also touched up on testing for exceptions in module and viewcommand result.

[codecov-io]

Codecov Report

Merging #651 (93d2de1) into master (524ab2e) will increase coverage by 6.73%.
The diff coverage is 74.66%.

@@             Coverage Diff              @@
##             master     #651      +/-   ##
============================================
+ Coverage     51.86%   58.59%   +6.73%     
- Complexity     1197     1339     +142     
============================================
  Files           245      247       +2     
  Lines          5158     5200      +42     
  Branches        670      686      +16     
============================================
+ Hits           2675     3047     +372     
+ Misses         2220     1878     -342     
- Partials        263      275      +12     

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/seedu/address/logic/ParserManager.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...gradetrackercommands/EditAssignmentDescriptor.java	75.00% <0.00%> (+75.00%)	11.00 <0.00> (+11.00)
.../seedu/address/logic/parser/ContactListParser.java	83.33% <ø> (ø)	15.00 <0.00> (?)
...seedu/address/model/module/grade/GradeTracker.java	70.58% <35.71%> (+6.39%)	24.00 <3.00> (+4.00)
...a/seedu/address/model/module/UniqueModuleList.java	73.17% <40.00%> (+9.75%)	16.00 <0.00> (+2.00)
...c/main/java/seedu/address/model/module/Module.java	58.77% <66.66%> (+7.46%)	25.00 <1.00> (+3.00)
...eedu/address/logic/commands/ViewCommandResult.java	88.88% <76.92%> (+88.88%)	13.00 <8.00> (+13.00)
.../gradetrackercommands/DeleteAssignmentCommand.java	96.87% <87.50%> (+96.87%)	12.00 <0.00> (+12.00)
...commands/gradetrackercommands/AddGradeCommand.java	100.00% <100.00%> (+100.00%)	11.00 <5.00> (+11.00)
...ds/gradetrackercommands/EditAssignmentCommand.java	80.00% <100.00%> (+80.00%)	16.00 <0.00> (+16.00)
... and 30 more

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[MatthiasLHK]

LGTM