public void Enumerator()
{
LinkedList ll = new LinkedList();
ll.Add("item1");
ll.Add("item2");
ll.Add("item3");
IEnumerator ienum = ll.GetEnumerator();
Assert.IsTrue(ienum.MoveNext());
Assert.IsTrue(ienum.Current.Equals("item1"), "Expected first element to be \"item1\" not " + ienum.Current);
Assert.IsTrue(ienum.MoveNext());
Assert.IsTrue(ienum.Current.Equals("item2"), "Expected second element to be \"item2\" not " + ienum.Current);
}
public void EnumeratorModification()
{
LinkedList ll = new LinkedList();
ll.Add("item1");
ll.Add("item2");
ll.Add("item3");
IEnumerator ienum = ll.GetEnumerator();
Assert.IsTrue(ienum.MoveNext());
ll.RemoveAt(0);
Assert.Throws<InvalidOperationException>(() => ienum.MoveNext());
}
public void EnumeratorModification()
{
LinkedList ll = new LinkedList();
ll.Add("item1");
ll.Add("item2");
ll.Add("item3");
IEnumerator ienum = ll.GetEnumerator();
Assert.IsTrue(ienum.MoveNext());
ll.RemoveAt(0);
ienum.MoveNext();
Assert.Fail("Expected enumerator to fail with InvalidOperationException");
}