Branch addlsn command test

[ryanlimjr]

Did test cases for addlsn command

[codecov-io]

Codecov Report

Merging #287 into master will increase coverage by 1.51%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #287      +/-   ##
============================================
+ Coverage     50.82%   52.34%   +1.51%     
- Complexity      842      866      +24     
============================================
  Files           155      154       -1     
  Lines          3921     3951      +30     
  Branches        471      475       +4     
============================================
+ Hits           1993     2068      +75     
+ Misses         1782     1732      -50     
- Partials        146      151       +5     

Impacted Files	Coverage Δ	Complexity Δ
.../serenity/logic/commands/lesson/AddLsnCommand.java	92.30% <100.00%> (+68.30%)	8.00 <1.00> (+5.00)
...team/serenity/logic/parser/SerenityParserUtil.java	83.72% <0.00%> (-4.09%)	12.00% <0.00%> (ø%)
...ty/logic/commands/studentinfo/SetScoreCommand.java	25.75% <0.00%> (-0.81%)	4.00% <0.00%> (ø%)
...y/logic/commands/studentinfo/UnflagAttCommand.java	22.41% <0.00%> (-0.81%)	4.00% <0.00%> (ø%)
...ty/logic/commands/studentinfo/AddScoreCommand.java	23.94% <0.00%> (-0.70%)	4.00% <0.00%> (ø%)
...ty/logic/commands/studentinfo/SubScoreCommand.java	23.94% <0.00%> (-0.70%)	4.00% <0.00%> (ø%)
...main/java/team/serenity/commons/util/XlsxUtil.java	42.00% <0.00%> (-0.36%)	20.00% <0.00%> (+3.00%)	⬇️
src/main/java/team/serenity/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
src/main/java/team/serenity/model/group/Group.java	32.14% <0.00%> (ø)	13.00% <0.00%> (ø%)
src/main/java/team/serenity/ui/DataPanel.java
... and 24 more

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