Test/more testing

[ryuash]

Description

Checklist

• [x] Targeted PR against correct branch.
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• [x] Wrote unit tests.
• [ ] Run flutter format.
• [ ] Updated the documentation.
• [ ] Added an entry to the CHANGELOG.md file.
• [x] Re-reviewed Files changed in the Github PR explorer.

[codecov[bot]]

Codecov Report

Merging #123 into master will increase coverage by 10.02%. The diff coverage is 40.42%.

@@             Coverage Diff             @@
##           master     #123       +/-   ##
===========================================
+ Coverage   35.60%   45.62%   +10.02%     
===========================================
  Files         262      261        -1     
  Lines        6606     6597        -9     
===========================================
+ Hits         2352     3010      +658     
+ Misses       4254     3587      -667     

Impacted Files	Coverage Δ
...osts/remote/converters/link_preview_converter.dart	0.00% <0.00%> (ø)
lib/ui/blocs/navigator/navigator_event.dart	14.28% <ø> (+4.76%)	:arrow_up:
lib/ui/blocs/post_details/post_details_bloc.dart	48.97% <0.00%> (-0.15%)	:arrow_down:
lib/ui/blocs/post_details/post_details_state.dart	39.39% <ø> (ø)
...eate_screen/blocs/post_input/post_input_state.dart	58.18% <0.00%> (+58.18%)	:arrow_up:
lib/ui/screens/post_create_screen/index.dart	0.00% <ø> (ø)
...eate_screen/widgets/create_post_content/index.dart	70.21% <ø> (+70.21%)	:arrow_up:
...main_content/widgets/post_comments_list/index.dart	0.00% <ø> (ø)
...comments_list/widgets/post_comment_item/index.dart	0.00% <ø> (ø)
lib/ui/screens/user_details_screen/index.dart	0.00% <0.00%> (ø)
... and 45 more

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