feat(tests): update few tests to improve coverage

[ghiscoding]

No description provided.

[codecov-io]

Codecov Report

Merging #201 into master will increase coverage by 0.35%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #201      +/-   ##
==========================================
+ Coverage   40.93%   41.27%   +0.35%     
==========================================
  Files         146      146              
  Lines        6771     6523     -248     
  Branches     2154     1953     -201     
==========================================
- Hits         2771     2692      -79     
+ Misses       3998     3822     -176     
- Partials        2        9       +7

Impacted Files	Coverage Δ
...ules/angular-slickgrid/formatters/maskFormatter.ts	100% <100%> (+6.67%)	⬆️
...ular-slickgrid/extensions/rowSelectionExtension.ts	52.95% <0%> (-41.17%)	⬇️
...modules/angular-slickgrid/services/grid.service.ts	15.03% <0%> (-5.69%)	⬇️
...s/angular-slickgrid/services/angularUtilService.ts	33.34% <0%> (-4.76%)	⬇️
...es/angular-slickgrid/filters/nativeSelectFilter.ts	12.86% <0%> (-1.42%)	⬇️
...slickgrid/components/slick-pagination.component.ts	19.09% <0%> (-1.37%)	⬇️
.../modules/angular-slickgrid/filters/sliderFilter.ts	17.73% <0%> (-1.26%)	⬇️
...s/angular-slickgrid/extensions/extensionUtility.ts	60.87% <0%> (-1.03%)	⬇️
...p/modules/angular-slickgrid/filters/inputFilter.ts	16.67% <0%> (-0.98%)	⬇️
...es/angular-slickgrid/filters/autoCompleteFilter.ts	17.22% <0%> (-0.66%)	⬇️
... and 35 more

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