"""Test suite for LogisticRegression.

Auto-generated test stub. Please implement comprehensive tests.
"""

import numpy as np
import pytest
import pickle

from tuiml.algorithms.linear import LogisticRegression


class TestLogisticRegressionInstantiation:
    """Tests for algorithm instantiation."""
    
    def test_default_initialization(self):
        """Test default initialization."""
        model = LogisticRegression()
        assert model is not None
        assert model._is_fitted is False
        
    def test_parameter_schema(self):
        """Test parameter schema."""
        schema = LogisticRegression.get_parameter_schema()
        assert isinstance(schema, dict)
        
    def test_capabilities(self):
        """Test capabilities."""
        caps = LogisticRegression.get_capabilities()
        assert isinstance(caps, list)


class TestLogisticRegressionFitting:
    """Tests for the fit() method."""
    
    def test_fit_basic(self, binary_cls_data):
        """Test basic fitting."""
        # TODO: Implement based on algorithm type
        pass
        
    def test_fit_before_predict_raises(self):
        """Test that predict raises error before fit."""
        model = LogisticRegression()
        with pytest.raises(RuntimeError, match="must be fitted"):
            model.predict(np.array([[1, 2, 3, 4]]))


class TestLogisticRegressionSerialization:
    """Tests for serialization."""
    
    def test_pickle_roundtrip(self, binary_cls_data):
        """Test pickle serialization."""
        # TODO: Implement
        pass
