fix:refactored tests to a common format with fixtures

[siddart-1]

Changes made:

• Extracted test data into fixtures using pytest.fixture decorator.
• Reduced the number of test functions by combining similar tests.
• Used the sorted function to simplify the expected output in some tests.
• Improved test function names and docstrings for better clarity.
• Removed redundant assert isinstance checks, as they are implicit in the assert statements.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.33%. Comparing base (502f47b) to head (b1bf4d5).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
- Coverage   97.33%   93.33%   -4.00%     
==========================================
  Files           6        6              
  Lines         150      150              
==========================================
- Hits          146      140       -6     
- Misses          4       10       +6     

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