[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 82.26%. Comparing base (410f087) to head (261de55).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7719      +/-   ##
============================================
+ Coverage     82.22%   82.26%   +0.04%     
- Complexity     8402     8406       +4     
============================================
  Files           843      843              
  Lines         26143    26143              
  Branches       5101     5101              
============================================
+ Hits          21495    21507      +12     
+ Misses         3854     3843      -11     
+ Partials        794      793       -1     

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