CIF-1462 - Increase the coverage of the source code related to the Se…

[cjelger]

…arch feature

• extend unit tests

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[codecov]

Codecov Report

Merging #484 (082d1e2) into master (8f83768) will increase coverage by 0.63%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #484      +/-   ##
============================================
+ Coverage     86.16%   86.80%   +0.63%     
- Complexity     1170     1188      +18     
============================================
  Files           229      229              
  Lines          5783     5783              
  Branches        846      846              
============================================
+ Hits           4983     5020      +37     
+ Misses          636      613      -23     
+ Partials        164      150      -14     

Flag	Coverage Δ	Complexity Δ
integration	64.69% <0.00%> (ø)	0.00 <0.00> (ø)
jest	81.25% <ø> (ø)	0.00 <ø> (ø)
karma	94.54% <ø> (ø)	0.00 <ø> (ø)
unittests	87.74% <100.00%> (+1.24%)	0.00 <0.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
...rch/internal/services/SearchFilterServiceImpl.java	100.00% <100.00%> (+29.78%)	20.00 <0.00> (+6.00)
...ch/internal/services/SearchResultsServiceImpl.java	98.42% <100.00%> (+11.51%)	61.00 <0.00> (+11.00)
...core/search/internal/models/SearchOptionsImpl.java	100.00% <0.00%> (+2.94%)	18.00% <0.00%> (+1.00%)

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[dplaton]

Finally! No more coverage drops because of these classes!