Add tests for custom and categoryfilter buttons

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[codecov-commenter]

Codecov Report

Merging #29 (f295426) into main (6d3ac81) will decrease coverage by 4.16%. The diff coverage is 95.00%.

@@             Coverage Diff             @@
##              main      #29      +/-   ##
===========================================
- Coverage   100.00%   95.83%   -4.17%     
===========================================
  Files            4        7       +3     
  Lines            8       24      +16     
  Branches         0        3       +3     
===========================================
+ Hits             8       23      +15     
- Misses           0        1       +1     

Impacted Files	Coverage Δ
src/App.tsx	100.00% <ø> (ø)
src/components/Hero/Hero.tsx	100.00% <ø> (ø)
src/components/Blog/CategoryFilter.tsx	87.50% <87.50%> (ø)
src/components/Breaking/BreakingItem.tsx	100.00% <100.00%> (ø)
src/components/Breaking/BreakingNews.tsx	100.00% <100.00%> (ø)
src/components/Button/BlogFilterButton.tsx	100.00% <100.00%> (ø)
src/components/Button/CustomButton.tsx	100.00% <100.00%> (ø)

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