public void TestCompositeCollectionEnumrator()
{
List <int> list1 = Enumerable.Range(0, 10).ToList();
List <int> list2 = Enumerable.Range(10, 10).ToList();
CompositeCollection <int> comp = new CompositeCollection <int>(list1, list2);
int i = 0;
foreach (var item in comp)
{
Assert.Equal(item, i);
i++;
}
Assert.Equal(i, 20);
int[] array = new int[25];
comp.CopyTo(array, 1);
Assert.Equal(0, array[0]);
for (int j = 1; j < 21; j++)
{
Assert.Equal(j - 1, array[j]);
}
}