Converting test_study to pytest

[prady0t]

I've made some conversions to the test_study_functions.py file, and it now only uses pytest. List of changes made:

• Removed the unittest.TestCase class structure
• Converted setUp / tearDown into pytest fixtures
• Replaced helper methods with fixtures
• Removed all uses of self
• Replaced unittest.assert* with plain assert
• Removed test wrapper methods & replaced with parametrization
• Moved shared utilities into conftest.py

Metadata

• Reference Issue: Migrate all unittests to pytest #1252
• New Tests Added:
• Documentation Updated:
• Change Log Entry:

Details

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.72%. Comparing base (4b1bdf4) to head (f61b5eb).

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1439       +/-   ##
============================================
- Coverage    79.90%   52.72%   -27.18%     
============================================
  Files           36       36               
  Lines         4349     4349               
============================================
- Hits          3475     2293     -1182     
- Misses         874     2056     +1182     

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