Added missing tests for core classes

[codecov[bot]]

Codecov Report

Merging #106 (9c54abe) into develop (2119dd7) will increase coverage by 20.99%. The diff coverage is 100.00%.

@@              Coverage Diff              @@
##           develop      #106       +/-   ##
=============================================
+ Coverage    79.00%   100.00%   +20.99%     
=============================================
  Files           63        63               
  Lines         1186      1186               
=============================================
+ Hits           937      1186      +249     
+ Misses         249         0      -249     

Impacted Files	Coverage Δ
...framework/lib/src/core/use_case/helpers/input.dart	100.00% <ø> (+40.00%)	:arrow_up:
...rk/lib/src/utilities/clean_framework_observer.dart	100.00% <ø> (+11.11%)	:arrow_up:
...rc/core/external_interface/external_interface.dart	100.00% <100.00%> (+100.00%)	:arrow_up:
...ges/clean_framework_router/lib/src/app_router.dart	100.00% <100.00%> (+53.65%)	:arrow_up:
...ramework/lib/src/providers/external_interface.dart	100.00% <0.00%> (+2.77%)	:arrow_up:
...lean_framework/lib/src/utilities/deserializer.dart	100.00% <0.00%> (+6.66%)	:arrow_up:
...work/lib/src/core/external_interface/response.dart	100.00% <0.00%> (+16.66%)	:arrow_up:
.../clean_framework/lib/src/core/gateway/gateway.dart	100.00% <0.00%> (+48.14%)	:arrow_up:
... and 10 more

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