core-lightning/tests/test_plugin.py

from fixtures import *  # noqa: F401,F403

import subprocess


def test_option_passthrough(node_factory):
    """ Ensure that registering options works.

    First attempts without the plugin and then with the plugin.
    """
    plugin_path = 'contrib/plugins/helloworld.py'

    help_out = subprocess.check_output([
        'lightningd/lightningd',
        '--help'
    ]).decode('utf-8')
    assert('--greeting' not in help_out)

    help_out = subprocess.check_output([
        'lightningd/lightningd',
        '--plugin={}'.format(plugin_path),
        '--help'
    ]).decode('utf-8')
    assert('--greeting' in help_out)

    # Now try to see if it gets accepted, would fail to start if the
    # option didn't exist
    n = node_factory.get_node(options={'plugin': plugin_path, 'greeting': 'Mars'})
    n.stop()