public void EnumeratorTest()
{
var tree = new AvlTreeList <int>()
{
1, 2, 3
};
var enumerator = tree.GetEnumerator();
var result = enumerator.MoveNext();
Assert.True(result);
result = enumerator.MoveNext();
Assert.True(result);
result = enumerator.MoveNext();
Assert.True(result);
result = enumerator.MoveNext();
Assert.False(result);
result = enumerator.MoveNext();
Assert.False(result);
Assert.Throws <InvalidOperationException>(() => enumerator.Current);
}
