Add tests, remove main in DiceThrow/DP.java

[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 59.13%. Comparing base (6ddb26f) to head (d059c37).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5644      +/-   ##
============================================
+ Coverage     59.08%   59.13%   +0.05%     
+ Complexity     3782     3780       -2     
============================================
  Files           556      556              
  Lines         15933    15927       -6     
  Branches       3038     3038              
============================================
+ Hits           9414     9419       +5     
+ Misses         6117     6104      -13     
- Partials        402      404       +2     

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