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_shift(): dList = Double_list() dList.insert("Harry") dList.insert("Ron") dList.append("Snape") assert dList.shift() == "Snape" assert dList.list_ptr.node_next.node_next is None
def test_pop(): dList = Double_list() dList.insert("Harry") dList.insert("Ron") dList.append("Snape") assert dList.pop() == "Ron" assert dList.list_ptr.node_name == "Harry" assert dList.list_ptr.node_prev is None assert dList.list_ptr.node_next.node_name == "Snape"
def test_append(): dList = Double_list() dList.insert("Harry") dList.insert("Ron") dList.append("Snape") assert dList.list_ptr.node_next.node_name == "Harry" middle_node = dList.list_ptr.node_next assert middle_node.node_next.node_name == "Snape" assert middle_node.node_next.node_next is None assert middle_node.node_next.node_prev.node_name == "Harry"
def test_insert(): dList = Double_list() dList.insert("Harry") assert dList.list_ptr.node_name == "Harry" dList.insert("Ron") assert dList.list_ptr.node_name == "Ron" assert dList.list_ptr.node_next.node_name == "Harry" assert dList.list_ptr.node_next.node_prev.node_name == "Ron" dList.insert("Snape") middle_node = dList.list_ptr.node_next assert middle_node.node_prev.node_name == "Snape" assert middle_node.node_next.node_name == "Harry"
def test_empty(): dList = Double_list() with pytest.raises(AttributeError): dList.remove("Penguins")