feat(tests): add unit tests for SingleSelect & MultipleSelect Filters

[ghiscoding]

No description provided.

[codecov-io]

Codecov Report

Merging #273 into master will increase coverage by 1%.
The diff coverage is 85.72%.

@@           Coverage Diff           @@
##           master     #273   +/-   ##
=======================================
+ Coverage   78.34%   79.33%   +1%     
=======================================
  Files         134      134           
  Lines        7296     7323   +27     
  Branches     2505     2520   +15     
=======================================
+ Hits         5715     5809   +94     
+ Misses       1581     1514   -67

Impacted Files	Coverage Δ
.../modules/angular-slickgrid/editors/selectEditor.ts	14.29% <0%> (-0.05%)	⬇️
...es/angular-slickgrid/filters/autoCompleteFilter.ts	17.65% <0%> (-0.23%)	⬇️
.../modules/angular-slickgrid/filters/selectFilter.ts	99.55% <100%> (+33.37%)	⬆️
...pp/modules/angular-slickgrid/services/utilities.ts	100% <100%> (ø)	⬆️
...s/angular-slickgrid/services/collection.service.ts	100% <100%> (ø)	⬆️
.../angular-slickgrid/filters/multipleSelectFilter.ts	100% <0%> (+40%)	⬆️

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