Add tests for Convolution

[Hardvan]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.27%. Comparing base (596c614) to head (2742398).
Report is 7 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5766      +/-   ##
============================================
+ Coverage     64.05%   64.27%   +0.21%     
- Complexity     4177     4221      +44     
============================================
  Files           584      588       +4     
  Lines         16332    16426      +94     
  Branches       3152     3170      +18     
============================================
+ Hits          10461    10557      +96     
+ Misses         5445     5440       -5     
- Partials        426      429       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.