Tests/update command parser

[leeweiminsg]

• Fixed bugs
• Added weak equality checks
• Add test cases for update exercise parser

[codecov-io]

Codecov Report

Merging #41 into v1.2 will increase coverage by 0.59%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               v1.2      #41      +/-   ##
============================================
+ Coverage     58.48%   59.07%   +0.59%     
+ Complexity      506      505       -1     
============================================
  Files           100      100              
  Lines          1932     1933       +1     
  Branches        197      197              
============================================
+ Hits           1130     1142      +12     
+ Misses          723      705      -18     
- Partials         79       86       +7     

Impacted Files	Coverage Δ	Complexity Δ
...java/seedu/address/model/exercise/Description.java	70.00% <100.00%> (+3.33%)	6.00 <0.00> (ø)
.../seedu/address/logic/parser/EditCommandParser.java	50.00% <0.00%> (-42.31%)	3.00% <0.00%> (-8.00%)
.../address/logic/commands/UpdateExerciseCommand.java	85.71% <0.00%> (+1.58%)	12.00% <0.00%> (ø%)
...ress/logic/parser/UpdateExerciseCommandParser.java	100.00% <0.00%> (+100.00%)	7.00% <0.00%> (+7.00%)

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[Nahoyhp]

No problem found.

[Nauman-S]

Good use of comments