Tests for remaining Teammate associated classes

[GeNiaaz]

Resolve #284

Tests for the following classes included:

• AddTeammateParticipation / Parser
• DeleteTeammateParticipation / Parser
• EditTeammate / Parser
• DeleteTeammateCommand

[codecov-io]

Codecov Report

Merging #283 into master will increase coverage by 4.41%.
The diff coverage is 73.33%.

@@             Coverage Diff              @@
##             master     #283      +/-   ##
============================================
+ Coverage     63.82%   68.23%   +4.41%     
- Complexity      872      911      +39     
============================================
  Files           136      136              
  Lines          3074     3076       +2     
  Branches        414      414              
============================================
+ Hits           1962     2099     +137     
+ Misses         1001      847     -154     
- Partials        111      130      +19     

Impacted Files	Coverage Δ	Complexity Δ
...seedu/address/commons/core/index/GitUserIndex.java	72.72% <0.00%> (-5.06%)	8.00 <1.00> (+2.00)	⬇️
...n/java/seedu/address/commons/core/index/Index.java	100.00% <ø> (ø)	10.00 <0.00> (ø)
...ss/logic/commands/project/EditTeammateCommand.java	79.26% <ø> (+79.26%)	8.00 <0.00> (+8.00)
...eedu/address/logic/parser/MainCatalogueParser.java	61.19% <0.00%> (ø)	31.00 <0.00> (ø)
src/main/java/seedu/address/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...mands/project/AddTeammateParticipationCommand.java	100.00% <100.00%> (+100.00%)	7.00 <5.00> (+7.00)
...ds/project/DeleteTeammateParticipationCommand.java	53.33% <100.00%> (+53.33%)	6.00 <4.00> (+6.00)
.../parser/AddTeammateParticipationCommandParser.java	100.00% <100.00%> (ø)	2.00 <1.00> (?)
...rser/DeleteTeammateParticipationCommandParser.java	100.00% <100.00%> (ø)	2.00 <1.00> (?)
...rc/main/java/seedu/address/model/ModelManager.java	84.92% <100.00%> (-0.12%)	43.00 <0.00> (-1.00)
... and 14 more

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[lucastai98]

lgtm