Add tests, remove `main` in `RangeInSortedArray`

[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 65.01%. Comparing base (9c76b30) to head (da662c8).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5778      +/-   ##
============================================
+ Coverage     64.81%   65.01%   +0.20%     
- Complexity     4299     4313      +14     
============================================
  Files           599      599              
  Lines         16764    16759       -5     
  Branches       3219     3217       -2     
============================================
+ Hits          10865    10896      +31     
+ Misses         5455     5418      -37     
- Partials        444      445       +1     

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