Add tests, remove main in SaddlebackSearch

[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 62.23%. Comparing base (e8b3251) to head (f4c8e5d).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5674      +/-   ##
============================================
+ Coverage     62.13%   62.23%   +0.09%     
- Complexity     3981     3986       +5     
============================================
  Files           563      563              
  Lines         15948    15938      -10     
  Branches       3070     3068       -2     
============================================
+ Hits           9910     9919       +9     
+ Misses         5628     5607      -21     
- Partials        410      412       +2     

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