stevedore/stevedore/tests/test_hook.py

from stevedore import hook


def test_hook():
    em = hook.HookManager(
        'stevedore.test.extension',
        't1',
        invoke_on_load=True,
        invoke_args=('a',),
        invoke_kwds={'b': 'B'},
    )
    assert len(em.extensions) == 1
    assert em.names() == ['t1']