def test_remove():
dList = Double_list()
dList.insert("Harry")
dList.insert("Ron")
dList.append("Snape")
dList.remove("Harry")
assert dList.list_ptr.node_next.node_name == "Snape"
assert dList.list_ptr.node_next.node_prev.node_name == "Ron"
def test_empty():
dList = Double_list()
with pytest.raises(AttributeError):
dList.remove("Penguins")
