Add tests, remove `main` in `TernarySearch`

[Hardvan]

• [x] I have read CONTRIBUTING.md.
• [x] This pull request is all my own work -- I have not plagiarized it.
• [x] All filenames are in PascalCase.
• [x] All functions and variable names follow Java naming conventions.
• [x] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• [x] 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 :white_check_mark:

Project coverage is 62.55%. Comparing base (6802029) to head (0d8474d).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5677      +/-   ##
============================================
+ Coverage     62.40%   62.55%   +0.15%     
- Complexity     3984     3994      +10     
============================================
  Files           563      563              
  Lines         15911    15900      -11     
  Branches       3065     3064       -1     
============================================
+ Hits           9929     9947      +18     
+ Misses         5568     5541      -27     
+ Partials        414      412       -2     

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