def METHOD_NAME(
    connected_association, element_factory
):
    asc, c1, c2 = connected_association
    diagram2 = element_factory.create(Diagram)
    c3 = diagram2.create(ClassItem, subject=c1.subject)
    c4 = diagram2.create(ClassItem, subject=c2.subject)
    asc2 = diagram2.create(AssociationItem)
    connect(asc2, asc2.tail, c3)
    connect(asc2, asc2.head, c4)
    disconnect(asc, asc.head)
    assert not asc.subject
    assert not asc.head_subject
    assert not asc.tail_subject