Refactor existing and add new tests

[codecov-commenter]

Codecov Report

Merging #16 (50796a7) into master (27ad8c6) will increase coverage by 7.82%. The diff coverage is 77.32%.

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@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
+ Coverage   48.85%   56.68%   +7.82%     
==========================================
  Files          30       35       +5     
  Lines        1224     1549     +325     
  Branches      121      148      +27     
==========================================
+ Hits          598      878     +280     
- Misses        600      632      +32     
- Partials       26       39      +13     

Impacted Files	Coverage Δ
...SearchManager.Tests/mocks/MockCrawlScopeManager.cs	0.00% <0.00%> (ø)
...hManager.Tests/mocks/MockSearchRegistryProvider.cs	0.00% <0.00%> (ø)
...sSearchManager.Tests/xunit/ShallowFieldComparer.cs	61.53% <ø> (ø)
....WindowsSearchManager.Tests/xunit/SkipCondition.cs	81.25% <ø> (-2.09%)	:arrow_down:
...owsSearchManager.Tests/mocks/MockCommandRuntime.cs	18.51% <18.51%> (ø)
...rchManager.Tests/mocks/MockSearchManagerFactory.cs	71.42% <71.42%> (ø)
...dowsSearchManager.Tests/mocks/MockSearchManager.cs	63.63% <85.71%> (+8.08%)	:arrow_up:
...wsSearchManager.Tests/SearchApiCommandBaseTests.cs	86.31% <86.31%> (ø)
...Shell.WindowsSearchManager/SearchApiCommandBase.cs	70.45% <100.00%> (+70.45%)	:arrow_up:
...ndowsSearchManager.Tests/SearchCatalogInfoTests.cs	100.00% <100.00%> (ø)
... and 8 more