Add tests for LocalTranslationsRetriever

[codecov-commenter]

Codecov Report

Merging #444 (a7b21c6) into main (6cb2b98) will increase coverage by 1.24%. The diff coverage is 100.00%.

:exclamation: Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@            Coverage Diff             @@
##             main     #444      +/-   ##
==========================================
+ Coverage   83.45%   84.69%   +1.24%     
==========================================
  Files         186      189       +3     
  Lines        6786     6912     +126     
==========================================
+ Hits         5663     5854     +191     
+ Misses       1123     1058      -65     

Impacted Files	Coverage Δ
...sts/QuranTextKitTests/CompositeSearcherTests.swift	100.00% <ø> (ø)
.../QuranTextKitTests/QuranTextDataServiceTests.swift	100.00% <ø> (ø)
...TextKit/TranslationText/QuranTextDataService.swift	82.52% <100.00%> (-0.50%)	:arrow_down:
Sources/TestUtilities/LocalTranslationsFake.swift	100.00% <100.00%> (ø)
Sources/TestUtilities/TestResources.swift	100.00% <100.00%> (ø)
...ranslationService/LocalTranslationsRetriever.swift	100.00% <100.00%> (+4.34%)	:arrow_up:
...ationService/SelectedTranslationsPreferences.swift	100.00% <100.00%> (+87.50%)	:arrow_up:
...ranslationService/TranslationsVersionUpdater.swift	83.78% <100.00%> (+44.31%)	:arrow_up:
Sources/Utilities/Extensions/Array+Extension.swift	53.84% <100.00%> (+53.84%)	:arrow_up:
...ests/QuranTextKitTests/ImageDataServiceTests.swift	68.42% <100.00%> (ø)
... and 4 more

... and 4 files with indirect coverage changes