"""Test graphviz functionality."""
import os

from incorporealcms import create_app

HERE = os.path.dirname(os.path.abspath(__file__))


def app_with_pydot():
    """Create the test app, including the pydot extension."""
    return create_app(instance_path=os.path.join(HERE, 'instance'),
                      test_config={'MARKDOWN_EXTENSIONS': ['incorporealcms.mdx.pydot']})


def test_functional_initialization():
    """Test initialization with the graphviz config."""
    app = app_with_pydot()
    assert app is not None


def test_graphviz_is_rendered():
    """Initialize the app with the graphviz extension and ensure it does something."""
    app = app_with_pydot()
    client = app.test_client()

    response = client.get('/test-graphviz')
    assert response.status_code == 200
    assert b'~~~pydot' not in response.data
    assert b'data:image/png;base64' in response.data


def test_invalid_graphviz_is_not_rendered():
    """Check that invalid graphviz doesn't blow things up."""
    app = app_with_pydot()
    client = app.test_client()

    response = client.get('/test-invalid-graphviz')
    assert response.status_code == 500
    assert b'INTERNAL SERVER ERROR' in response.data