public void ImList_2_Add(int cnt)
{
var l = new ImList <D>();
for (int idx = 0; idx < cnt; idx++)
{
l = l.Add(new D(idx + 1));
}
Assert.Equal(cnt, l.Count);
var arr = l.ToArray();
Assert.Equal(cnt, arr.Length);
for (int idx = 0; idx < cnt; idx++)
{
Assert.Equal(idx + 1, arr[idx].Data1);
}
}