Update CaesarTest.java

[Sajtine]

• 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 73.94%. Comparing base (d4b28b3) to head (0f3f949).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6161   +/-   ##
=========================================
  Coverage     73.94%   73.94%           
  Complexity     5161     5161           
=========================================
  Files           662      662           
  Lines         17695    17695           
  Branches       3412     3412           
=========================================
  Hits          13085    13085           
  Misses         4102     4102           
  Partials        508      508           

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