Undo feature tests

[hanstirtaputra]

closes #220

[codecov-io]

Codecov Report

Merging #222 into master will increase coverage by 0.36%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #222      +/-   ##
============================================
+ Coverage     54.74%   55.10%   +0.36%     
- Complexity      977      986       +9     
============================================
  Files           204      204              
  Lines          3860     3860              
  Branches        448      448              
============================================
+ Hits           2113     2127      +14     
+ Misses         1622     1606      -16     
- Partials        125      127       +2     

Impacted Files	Coverage Δ	Complexity Δ
...java/seedu/homerce/logic/commands/UndoCommand.java	14.28% <0.00%> (+14.28%)	2.00 <0.00> (+2.00)
...va/seedu/homerce/model/manager/HistoryManager.java	92.85% <ø> (+7.14%)	9.00 <0.00> (+1.00)
...e/logic/commands/service/DeleteServiceCommand.java	13.04% <0.00%> (+13.04%)	2.00% <0.00%> (+2.00%)
...rc/main/java/seedu/homerce/model/undo/History.java	100.00% <0.00%> (+33.33%)	3.00% <0.00%> (+2.00%)
...erce/logic/commands/service/AddServiceCommand.java	45.45% <0.00%> (+45.45%)	2.00% <0.00%> (+2.00%)

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