test:improve test coverage

Overview

This MR significantly improves test coverage, reliability, and stability of key modules in the application without changing existing functionality.

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🚀 Test Coverage Improvements

File	Before Coverage	After Coverage
modes/team_leaderboard.py	36%	100% ✅
tests/test_client.py	66%	100% ✅
tests/test_asyncio_patch.py	0%	100% ✅
tests/test_asyncio_patch_2.py	0%	100% ✅

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🔧 Changes made

modes/team_leaderboard.py

• Added comprehensive test cases to cover all logic paths
• Ensured coverage for sorting, filtering, and aggregation logic
• Covered edge cases such as empty datasets and inconsistent data
• Improved reliability through full branch coverage

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gitlab_utils/client.py

• Added test cases to validate API interactions
• Covered success and failure scenarios
• Ensured proper handling of unexpected API responses

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batch_mode/export_service.py

• Added tests for export workflows
• Covered edge cases like empty and malformed data
• Ensured robustness of batch processing logic

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Async Patch Test Files

• tests/test_asyncio_patch.py
• tests/test_asyncio_patch_2.py

Added full async test coverage including:

• asyncio event loop handling (success & failure)
• RuntimeError scenarios
• asyncio.new_event_loop fallback
• nest_asyncio.apply execution
• Multiple execution paths and edge cases

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🎯 Why these changes?

• To achieve 100% test coverage across critical modules
• To ensure all branches, edge cases, and exceptions are tested
• To improve code reliability and prevent regressions
• To strengthen CI/CD pipeline stability
• To maintain existing functionality without any changes

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🧪 How to set up and validate locally

1. Checkout the branch:

   git checkout test/improve-test-coverage
   git pull origin test/improve-test-coverage

2. Install dependencies:

   pip install -r requirements.txt

3. Run tests with coverage:

   pytest --cov=. 
   

4. Verify:

   • All tests pass ✅
   • Coverage shows 100% for updated files ✅
   • No functionality is broken ✅

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MR acceptance checklist

• No existing functionality changed
• 100% test coverage achieved for targeted modules
• All edge cases and exception paths covered
• Tests are stable and deterministic
• No breaking changes introduced
• Code quality and maintainability improved