public void Cat1Test()
{
var list1 = "a b c".Split().Aggregate(CatenableList <string> .Empty, (current, word) => CatenableList <string> .Cons(word, current));
var list3 = CatenableList <string> .Cat(list1, CatenableList <string> .Empty);
Assert.AreSame(list1, list3);
}
public void Cat2Test()
{
var list2 = "x y z".Split().Aggregate(CatenableList <string> .Empty, (current, word) => CatenableList <string> .Cons(word, current));
var list3 = CatenableList <string> .Cat(CatenableList <string> .Empty, list2);
Assert.AreSame(list2, list3);
}
public void Cat3Test()
{
var list1 = "a b c".Split().Aggregate(CatenableList <string> .Empty, (current, word) => CatenableList <string> .Cons(word, current));
var list2 = "x y z".Split().Aggregate(CatenableList <string> .Empty, (current, word) => CatenableList <string> .Cons(word, current));
var list3 = CatenableList <string> .Cat(list1, list2);
Assert.AreEqual("c, b, a, z, y, x", DumpList(list3));
}
public void TailTest()
{
var list0 = CatenableList <string> .Empty;
var list1 = CatenableList <string> .Cons("Rest", list0);
var list2 = CatenableList <string> .Cons("Head", list1);
Assert.AreSame(list1, CatenableList <string> .Tail(list2));
}
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));
}
public void IsEmptyTest()
{
var list = CatenableList <string> .Empty;
Assert.IsTrue(CatenableList <string> .IsEmpty(list));
Assert.AreEqual("\u2205", DumpList(list));
list = CatenableList <string> .Cons("A", list);
Assert.IsFalse(CatenableList <string> .IsEmpty(list));
Assert.AreEqual("A", DumpList(list));
}
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 SnocTest()
{
var list1 = "a b c".Split().Aggregate(CatenableList <string> .Empty, (current, word) => CatenableList <string> .Snoc(current, word));
Assert.AreEqual("a, b, c", DumpList(list1));
}
public void ConsTest()
{
var list1 = "a b c".Split().Aggregate(CatenableList <string> .Empty, (current, word) => CatenableList <string> .Cons(word, current));
Assert.AreEqual("c, b, a", DumpList(list1));
}
public void EmptyTailTest()
{
var list = CatenableList <string> .Empty;
AssertThrows <ArgumentNullException>(() => CatenableList <string> .Tail(list));
}