import pytest
from unittest.mock import Mock, patch
import json
from io import StringIO
from pydantic import ValidationError
from app.pipeline import Pipeline
from app.models import PydanticEncoder, Message, Card, parse_message

# Tests for Pipeline class
@pytest.fixture
def mock_pipeline():
    with patch('app.pipeline') as mock_pipe:
        mock_pipe.return_value = Mock()
        yield Pipeline("mock_model")

# Test for PydanticEncoder
def test_pydantic_encoder():
    card = Card(question="Q", answer="A")
    encoded = json.dumps(card, cls=PydanticEncoder)
    assert json.loads(encoded) == {"question": "Q", "answer": "A"}

# Test error cases
def test_message_invalid_content():
    with pytest.raises(ValidationError):
        Message(role="assistant", content="Invalid content")