Update from task 8b7ed792-4267-4c8e-b170-6e637141ce9f#12
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…ing components Key features implemented: - New tests package initialization with tests/__init__.py - Comprehensive feature engineering tests in test_feature_engineering.py covering data leakage prevention, categorical encoding strategies, feature scaling procedures, missing value imputation, train-test splitting, and data quality validation - Complete modeling pipeline tests in test_modeling.py including model training, evaluation metrics, cross-validation, overfitting detection, class imbalance handling, feature importance extraction, and model comparison procedures - Updated .gitignore with proper Python test artifacts exclusion pattern The test suite provides complete coverage of the ML pipeline from preprocessing through model evaluation with focus on data integrity and algorithm correctness.
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This PR was created by qwen-chat coder for task 8b7ed792-4267-4c8e-b170-6e637141ce9f.