public void TestDoublyLinkedList()
{
int retVal;
DoublyLinkedList dll = new DoublyLinkedList(5);
// Push()
dll.DeleteAt(0);
dll.Push(1); // LL is empty
Assert.AreEqual(new List<int>() { 1 }, dll.ReturnList());
dll.Push(2); // LL.count == 1
Assert.AreEqual(new List<int>() { 2, 1 }, dll.ReturnList());
dll.Push(3); // LL.count > 1
Assert.AreEqual(new List<int>() { 3, 2, 1 }, dll.ReturnList());
// Delete()
dll.InitializeDLL();
retVal = dll.Delete(111); // doesn't exist
Assert.AreEqual(new List<int>() { 5, 4, 3, 2, 1,0 }, dll.ReturnList());
Assert.AreEqual(-1, retVal);
retVal = dll.Delete(0); // exists at tail
Assert.AreEqual(new List<int>() { 5, 4, 3, 2, 1 }, dll.ReturnList());
Assert.AreEqual(0, retVal);
retVal = dll.Delete(5); // exists at head
Assert.AreEqual(new List<int>() { 4, 3, 2, 1 }, dll.ReturnList());
Assert.AreEqual(5, retVal);
retVal = dll.Delete(3); // exists between head and tail
Assert.AreEqual(new List<int>() { 4, 2, 1 }, dll.ReturnList());
Assert.AreEqual(3, retVal);
// DeleteAt()
dll.InitializeDLL();
retVal = dll.DeleteAt(-23); // invalid index
Assert.AreEqual(new List<int>() { 5, 4, 3, 2, 1, 0 }, dll.ReturnList());
Assert.AreEqual(-1, retVal);
retVal = dll.DeleteAt(7); // invalid index
Assert.AreEqual(new List<int>() { 5, 4, 3, 2, 1, 0 }, dll.ReturnList());
Assert.AreEqual(-1, retVal);
retVal = dll.DeleteAt(0); // exists at head
Assert.AreEqual(new List<int>() { 4, 3, 2, 1, 0 }, dll.ReturnList());
Assert.AreEqual(5, retVal);
retVal = dll.DeleteAt(4); // exists at tail
Assert.AreEqual(new List<int>() { 4, 3, 2, 1 }, dll.ReturnList());
Assert.AreEqual(0, retVal);
retVal = dll.DeleteAt(1); // exists between head and tail
Assert.AreEqual(new List<int>() { 4, 2, 1 }, dll.ReturnList());
Assert.AreEqual(3, retVal);
// Search()
dll.InitializeDLL();
Assert.AreEqual(-1, dll.Search(111)); // doesn't exist
Assert.AreEqual(5, dll.Search(5)); // exists at head
Assert.AreEqual(0, dll.Search(0)); // exists at tail
Assert.AreEqual(3, dll.Search(3)); // exists in between head and tail
Assert.AreEqual(new List<int>() { 5, 4, 3, 2, 1, 0 }, dll.ReturnList());
// Append()
dll = new DoublyLinkedList(0);
dll.DeleteAt(0);
dll.Append(0); // LL is empty
Assert.AreEqual(new List<int>() { 0 }, dll.ReturnList());
dll.Append(1); // LL.count = 1
Assert.AreEqual(new List<int>() { 0, 1 }, dll.ReturnList());
dll.Append(2);
Assert.AreEqual(new List<int>() { 0, 1, 2 }, dll.ReturnList());
dll.Append(3); // LL.count > 1
Assert.AreEqual(new List<int>() { 0, 1, 2, 3 }, dll.ReturnList());
// Pop()
dll = new DoublyLinkedList(0);
dll.Append(1);
dll.Append(2);
Assert.AreEqual(2, dll.Pop()); // LL.count > 1;
Assert.AreEqual(new List<int>() { 0, 1 }, dll.ReturnList());
Assert.AreEqual(1, dll.Pop()); // LL.count > 1;
Assert.AreEqual(new List<int>() { 0 }, dll.ReturnList());
Assert.AreEqual(0, dll.Pop()); // LL.count == 1;
Assert.AreEqual(new List<int>(), dll.ReturnList());
Boolean isException = false;
try
{
dll.Pop();
}
catch
{
isException = true;
}
Assert.IsTrue(isException);
}