Refactor and test products

[ghost]

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#### [](https://app.codesee.io/r/reviews?pr=482&src=https%3A%2F%2Fgithub.com%2FAnalogIO%2Fcoffeecard_app) #### Legend

[fremartini]

Currently broken because of Mockito not supporting record types. PR https://github.com/dart-lang/mockito/pull/645 should address this.

[codecov[bot]]

Codecov Report

Merging #482 (ee12b94) into develop (7505c32) will decrease coverage by 1.13%. The diff coverage is 47.05%.

:exclamation: Current head ee12b94 differs from pull request most recent head 99f2158. Consider uploading reports for the commit 99f2158 to get more accurate results

@@             Coverage Diff             @@
##           develop     #482      +/-   ##
===========================================
- Coverage    72.19%   71.07%   -1.13%     
===========================================
  Files          108      110       +2     
  Lines         1158     1165       +7     
===========================================
- Hits           836      828       -8     
- Misses         322      337      +15     

Flag	Coverage Δ
unittests	71.07% <47.05%> (-1.13%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ures/product/domain/usecases/get_all_products.dart	0.00% <0.00%> (ø)
...ures/product/presentation/cubit/product_cubit.dart	0.00% <0.00%> (ø)
...es/purchase/presentation/cubit/purchase_cubit.dart	95.55% <ø> (ø)
lib/utils/firebase_analytics_event_logging.dart	0.00% <ø> (ø)
...ures/product/presentation/cubit/product_state.dart	20.00% <33.33%> (ø)
...t/data/datasources/product_remote_data_source.dart	100.00% <100.00%> (ø)
...ib/features/product/data/models/product_model.dart	100.00% <100.00%> (ø)
lib/features/product/domain/entities/product.dart	60.00% <100.00%> (ø)

... and 3 files with indirect coverage changes