Add simple tests for meeting

[nopenotj]

resolves #117

[codecov-io]

Codecov Report

Merging #121 into master will increase coverage by 1.03%.
The diff coverage is 23.25%.

@@             Coverage Diff              @@
##             master     #121      +/-   ##
============================================
+ Coverage     51.77%   52.81%   +1.03%     
- Complexity      507      532      +25     
============================================
  Files           110      112       +2     
  Lines          2200     2240      +40     
  Branches        278      281       +3     
============================================
+ Hits           1139     1183      +44     
+ Misses          968      956      -12     
- Partials         93      101       +8     

Impacted Files	Coverage Δ	Complexity Δ
...eedu/address/logic/commands/ListModuleCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../address/logic/parser/ListModuleCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...a/seedu/address/logic/parser/ModuleBookParser.java	15.38% <0.00%> (-1.29%)	2.00 <0.00> (ø)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	61.85% <0.00%> (+0.05%)	28.00 <0.00> (+2.00)
src/main/java/seedu/address/model/ModuleBook.java	51.85% <0.00%> (-2.00%)	8.00 <0.00> (ø)
...a/seedu/address/model/module/UniqueModuleList.java	31.81% <0.00%> (-0.74%)	7.00 <0.00> (ø)
...ss/model/person/PersonHasTagsAndNamePredicate.java	36.36% <0.00%> (-3.64%)	3.00 <0.00> (ø)
...u/address/model/person/PersonHasTagsPredicate.java	42.85% <0.00%> (-7.15%)	2.00 <0.00> (ø)
...eedu/address/logic/commands/AddMeetingCommand.java	43.18% <100.00%> (+43.18%)	9.00 <1.00> (+9.00)
... and 11 more

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[gloon99]

lgtm