def METHOD_NAME(lonely_ursula_maker, mocker):
    domain = "learner-domain"
    mocker.patch.dict(TEACHER_NODES, {domain: ("teacher-uri",)}, clear=True)
    # Create a learner and a teacher
    learner, teacher = lonely_ursula_maker(domain=domain, quantity=2, save_metadata=False)
    mocker.patch.object(Ursula, 'from_teacher_uri', return_value=teacher)
    # Since there are no nodes in local node storage, the learner should only learn about the teacher
    learner.learn_from_teacher_node()
    assert set(learner.known_nodes) == {teacher}