Add unit tests for graph algorithms (BFS, DFS, Dijkstra, Bellman-Ford…

[prashantdubeypng]

…) #7133

• Created BellmanFordTest.java with 10 test methods covering various graph scenarios

• Created ConnectedComponentTest.java with 15 test methods for DFS-based component counting

• Enhanced MatrixGraphsTest.java with additional BFS/DFS test cases

• Enhanced DijkstraAlgorithmTest.java with comprehensive shortest path tests

Fixes #7133

• 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 78.87%. Comparing base (316def4) to head (3fe62da).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7152      +/-   ##
============================================
+ Coverage     78.62%   78.87%   +0.25%     
- Complexity     6825     6828       +3     
============================================
  Files           766      766              
  Lines         22607    22607              
  Branches       4444     4444              
============================================
+ Hits          17774    17831      +57     
+ Misses         4119     4064      -55     
+ Partials        714      712       -2     

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[DenizAltunkapan]

@prashantdubeypng please check if the merge was correct and format your code if so please

[github-actions]

This pull request has been automatically closed because its workflows or checks failed and it has been inactive for more than 14 days. Please fix the workflows and reopen if you'd like to continue. Merging from main/master alone does not count as activity.