public void HeadTest()
{
const string head = "Head";
var list0 = CatenableList <string> .Empty;
var list1 = CatenableList <string> .Cons("Rest", list0);
var list2 = CatenableList <string> .Cons(head, list1);
Assert.AreSame(head, CatenableList <string> .Head(list2));
}
private static string DumpList <T>(CatenableList <T> .C list)
{
if (CatenableList <T> .IsEmpty(list))
{
return("\u2205");
}
var result = new StringBuilder();
while (!CatenableList <T> .IsEmpty(list))
{
result.Append(CatenableList <T> .Head(list));
list = CatenableList <T> .Tail(list);
result.Append(", ");
}
result.Remove(result.Length - 2, 2);
return(result.ToString());
}
public void EmptyHeadTest()
{
var list = CatenableList <string> .Empty;
AssertThrows <ArgumentNullException>(() => CatenableList <string> .Head(list));
}