"""
Behavioral Testing Module for Skill Classification Model

This module implements behavioral tests as described by Ribeiro et al. (2020).
Tests are organized into three categories:
- Invariance Tests: Changes in input should not affect the output
- Directional Tests: Changes in input should lead to predictable changes in output  
- Minimum Functionality Tests: Model should perform well on basic examples

Reference: Ribeiro et al., "Beyond Accuracy: Behavioral Testing of NLP models with CheckList"
"""