test: EditDistanceTest

[alxkm]

Added tests.

• 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 47.91%. Comparing base (cdb6412) to head (fd4de04).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5397      +/-   ##
============================================
+ Coverage     47.75%   47.91%   +0.15%     
- Complexity     2956     2962       +6     
============================================
  Files           524      524              
  Lines         15293    15284       -9     
  Branches       2905     2905              
============================================
+ Hits           7303     7323      +20     
+ Misses         7689     7660      -29     
  Partials        301      301              

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