public void TestLinks()
{
LListNode <string> empty = new LListNode <string>();
LListNode <string> valueA = new LListNode <string>("A");
LListNode <string> valueB = new LListNode <string>("B");
LListNode <string> .LList list = new LListNode <string> .LList();
list.AddFirst(empty);
Assert.AreEqual(1, list.Count);
Assert.AreEqual(empty, list.First);
Assert.AreEqual(empty, list.Last);
Assert.IsNull(empty.Next);
Assert.IsNull(empty.Previous);
list.AddLast(valueB);
Assert.AreEqual(2, list.Count);
Assert.AreEqual(empty, list.First);
Assert.AreEqual(valueB, list.Last);
Assert.AreEqual(valueB, empty.Next);
Assert.IsNull(empty.Previous);
Assert.AreEqual(empty, valueB.Previous);
Assert.IsNull(valueB.Next);
list.AddFirst(valueA);
Assert.AreEqual(3, list.Count);
Assert.AreEqual(valueA, list.First);
Assert.AreEqual(valueB, list.Last);
Assert.AreEqual(valueB, empty.Next);
Assert.AreEqual(valueA, empty.Previous);
Assert.AreEqual(empty, valueA.Next);
Assert.IsNull(valueA.Previous);
Assert.AreEqual(empty, valueB.Previous);
Assert.IsNull(valueB.Next);
list.Remove(empty);
Assert.AreEqual(2, list.Count);
Assert.AreEqual(valueA, list.First);
Assert.AreEqual(valueB, list.Last);
Assert.AreEqual(valueB, valueA.Next);
Assert.IsNull(valueA.Previous);
Assert.AreEqual(valueA, valueB.Previous);
Assert.IsNull(valueB.Next);
}
public void TestEnumerator()
{
LListNode <string> .LList list = new LListNode <string> .LList();
list.AddLast("B");
list.AddFirst("A");
System.Collections.Generic.IEnumerator <LListNode <string> > e = list.GetEnumerator();
using (e)
{
Assert.IsTrue(e.MoveNext());
Assert.IsTrue(ReferenceEquals(e.Current, ((System.Collections.IEnumerator)e).Current));
Assert.AreEqual("A", e.Current.Value);
list.Remove(e.Current);
Assert.IsTrue(e.MoveNext());
Assert.IsTrue(ReferenceEquals(e.Current, ((System.Collections.IEnumerator)e).Current));
Assert.AreEqual("B", e.Current.Value);
list.Remove(e.Current);
Assert.IsFalse(e.MoveNext());
Assert.IsTrue(list.IsEmpty);
list.AddLast(String.Empty);
e.Reset();
Assert.IsTrue(e.MoveNext());
Assert.AreEqual(String.Empty, e.Current.Value);
Assert.IsFalse(e.MoveNext());
try
{
GC.KeepAlive(e.Current);
Assert.Fail();
}
catch (InvalidOperationException)
{ }
}
//now e is disposed...
try
{
e.MoveNext();
Assert.Fail();
}
catch (ObjectDisposedException) { }
try
{
GC.KeepAlive(e.Current);
Assert.Fail();
}
catch (ObjectDisposedException) { }
try
{
e.Reset();
Assert.Fail();
}
catch (ObjectDisposedException) { }
}
public void TestAddFirst()
{
LListNode <string> .LList list = new LListNode <string> .LList();
Assert.IsTrue(list.IsEmpty);
list.AddLast("B");
Assert.IsFalse(list.IsEmpty);
list.AddFirst("A");
Assert.AreEqual("A", list.First.Value);
Assert.AreEqual("B", list.Last.Value);
}