def test_delete_next_reassignment(): l = Slist() l.prepend("Bob") l.prepend("Dave") l.prepend("Amy") l.prepend("Carol") l.delete("Amy") l.delete("Dave") assert l.head.next.key == "Bob"
def test_delete(): l = Slist() l.prepend("Bob") l.prepend("Amy") l.prepend("Carol") l.delete("Carol") assert l.head.key == "Amy" l.delete("Bob") assert l.head.next is None l = Slist() l.prepend("Bob") l.prepend("Amy") l.prepend("Carol") with pytest.raises(ValueError): l.delete("Edgar") l = Slist() with pytest.raises(ValueError): l.delete("Edgar")