refactor: unit tests

[rot1024]

• Fix and rename
  • property.Field.UpdateRepresentativeField -> property.Field.RepresentativeField
  • scene/PluginSystem -> scene/Plugins
  • scene/WidgetSystem -> scene/Widgets
• Fix unit tests
  • Fix tests for errors: assert.True(t, errors.As(tt.err, &err)) -> assert.Equal(t, tt.err, err)
  • Fix tests for panics: use assert.Panics
• Refactor unit tests
  • Add line breaks
  • Rename variables, structs and field names of test cases
  • Adopt args pattern to represent args of tested functions
  • Enable parallel for most tests

[codecov]

Codecov Report

Merging #99 (5f54e71) into main (bbe13d8) will increase coverage by 0.58%.
The diff coverage is 67.14%.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   33.03%   33.61%   +0.58%     
==========================================
  Files         299      296       -3     
  Lines       27068    26608     -460     
==========================================
+ Hits         8941     8945       +4     
+ Misses      17313    16854     -459     
+ Partials      814      809       -5     

Impacted Files	Coverage Δ
internal/adapter/gql/gqlmodel/convert_scene.go	0.00% <0.00%> (ø)
internal/adapter/gql/resolver_mutation_scene.go	0.00% <0.00%> (ø)
internal/infrastructure/mongo/mongodoc/scene.go	0.00% <0.00%> (ø)
internal/usecase/interactor/plugin_delete.go	0.00% <0.00%> (ø)
internal/usecase/interactor/plugin_upload.go	0.00% <0.00%> (ø)
internal/usecase/interactor/property.go	0.00% <0.00%> (ø)
internal/usecase/interactor/scene.go	0.00% <0.00%> (ø)
pkg/property/group.go	78.26% <83.33%> (+1.63%)	⬆️
pkg/scene/plugins.go	97.43% <91.66%> (ø)
internal/infrastructure/github/plugin_registry.go	100.00% <100.00%> (ø)
... and 17 more