"""
Unit tests for config_validator.py
"""
import pytest
import pandas as pd
from pathlib import Path
import sys

# Add parent directory to path
sys.path.insert(0, str(Path(__file__).parent.parent))

from config_validator import validate_config

class TestConfigValidator:
    """Test configuration validation"""
    
    def test_validate_config_missing_column(self):
        """Test validation catches missing columns"""
        df = pd.DataFrame({
            'SomeColumn': [1, 2, 3]
        })
        
        errors, warnings = validate_config(df)
        
        # Should have errors for missing required columns
        assert len(errors) > 0
        assert any('not found' in error.lower() for error in errors)
    
    def test_validate_config_valid_data(self):
        """Test validation with valid data"""
        df = pd.DataFrame({
            'InvoiceDate': pd.to_datetime(['2023-01-01', '2023-02-01']),
            'USD': [100.0, 200.0],
            'Year': [2023, 2023]
        })
        
        errors, warnings = validate_config(df)
        
        # Should have minimal errors (may have warnings about missing optional columns)
        # But should not have critical errors if basic structure is correct
        critical_errors = [e for e in errors if 'not found' in e.lower() and 'USD' in e or 'InvoiceDate' in e]
        assert len(critical_errors) == 0

if __name__ == "__main__":
    pytest.main([__file__, '-v'])