public void AddNodeBeforeWhereSpecifiedNodeIsHead(object value)
{
Node firstNode = new Node("First");
LListDouble ll = new LListDouble(firstNode);
Assert.Equal("First", ll.Head.Value);
Node newNode = new Node(value);
ll.AddNodeBefore(newNode, firstNode);
Assert.Equal(value, ll.Head.Value);
}
public void AddNodeBeforeWhereSpecifiedNodeIsTrue(object value)
{
Node firstNode = new Node("First");
Node secondNode = new Node("Second");
Node thirdNode = new Node("Third");
LListDouble ll = new LListDouble(firstNode);
ll.Add(secondNode);
ll.Add(thirdNode);
Node newNode = new Node(value);
var IsSuccessful = ll.AddNodeBefore(newNode, firstNode);
Assert.True(IsSuccessful);
Assert.Equal(secondNode.Next, newNode);
}
public void AddNodeBeforeWhereSpecifiedNodeIsFalse(object value)
{
Node firstNode = new Node("First");
Node secondNode = new Node("Second");
Node thirdNode = new Node("Third");
Node randomNode = new Node("Nope");
LListDouble ll = new LListDouble(firstNode);
ll.Add(secondNode);
ll.Add(thirdNode);
Node newNode = new Node(value);
var IsSuccessful = ll.AddNodeBefore(newNode, randomNode);
Assert.False(IsSuccessful);
}