Update tests and fix bugs in UnassignCommandTest

[florenciamartina]

Fixes #116

[codecov-io]

Codecov Report

Merging #135 into master will increase coverage by 0.18%.
The diff coverage is 81.25%.

@@             Coverage Diff              @@
##             master     #135      +/-   ##
============================================
+ Coverage     74.09%   74.27%   +0.18%     
- Complexity      713      719       +6     
============================================
  Files           109      109              
  Lines          1984     1998      +14     
  Branches        231      236       +5     
============================================
+ Hits           1470     1484      +14     
- Misses          444      445       +1     
+ Partials         70       69       -1     

Impacted Files	Coverage Δ	Complexity Δ
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...a/seedu/address/model/module/UniqueModuleList.java	61.90% <57.14%> (-6.93%)	28.00 <2.00> (ø)
.../seedu/address/logic/commands/UnassignCommand.java	92.30% <100.00%> (+19.58%)	13.00 <0.00> (+3.00)
src/main/java/seedu/address/model/AddressBook.java	71.92% <100.00%> (-0.80%)	21.00 <1.00> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	88.75% <100.00%> (+0.28%)	34.00 <1.00> (+1.00)
...c/main/java/seedu/address/model/module/Module.java	94.87% <100.00%> (+12.37%)	21.00 <1.00> (+2.00)

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[erinmayg]

Minor changes requested 😄