tests: add even more tests

[codecov[bot]]

Codecov Report

Merging #321 (8bd44e4) into development (eea7947) will increase coverage by 7.04%. The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           development     #321      +/-   ##
===============================================
+ Coverage        19.91%   26.96%   +7.04%     
===============================================
  Files              139      139              
  Lines             3620     3620              
===============================================
+ Hits               721      976     +255     
+ Misses            2899     2644     -255     

Impacted Files	Coverage Δ
...crowdaction_details/widgets/commitment_badges.dart	100.00% <100.00%> (ø)
lib/infrastructure/core/injection.dart	33.33% <0.00%> (+33.33%)	:arrow_up:
lib/presentation/onboarding/onboarding_screen.dart	80.00% <0.00%> (+77.50%)	:arrow_up:
lib/presentation/shared_widgets/custom_fab.dart	100.00% <0.00%> (+87.50%)	:arrow_up:
.../shared_widgets/custom_app_bars/custom_appbar.dart	91.66% <0.00%> (+87.50%)	:arrow_up:
lib/presentation/auth/widgets/legal_notice.dart	100.00% <0.00%> (+92.30%)	:arrow_up:
lib/presentation/licenses/licenses_page.dart	96.42% <0.00%> (+92.85%)	:arrow_up:
...red_widgets/shimmers/top_participants_shimmer.dart	100.00% <0.00%> (+94.11%)	:arrow_up:
...ared_widgets/shimmers/commitment_card_shimmer.dart	100.00% <0.00%> (+95.83%)	:arrow_up:
... and 3 more

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