[NanditaMazz]

Description

Added unit tests for the Fibonacci matrix exponentiation implementation.

Test cases

• Fibonacci of 0 (identity matrix)
• Fibonacci of 1
• Even input (2)
• Odd input (3)
• Fibonacci of 10
• Large input (50)

Testing

• mvn -Dtest=FibonacciTest test — BUILD SUCCESS

• 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 algorithms include a corresponding test class that validates their functionality.
• 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 82.27%. Comparing base (6edd2d8) to head (7946373).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7719      +/-   ##
============================================
+ Coverage     82.23%   82.27%   +0.04%     
- Complexity     8405     8409       +4     
============================================
  Files           843      843              
  Lines         26140    26140              
  Branches       5100     5100              
============================================
+ Hits          21495    21506      +11     
+ Misses         3854     3843      -11     
  Partials        791      791              

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[DenizAltunkapan]

@NanditaMazz thanks! very helpful.