public void HeadTest()
{
const string data = "One Two Three One Three";
var queue = data.Split().Aggregate(RealTimeDeque <string> .Empty, (queue1, s) => RealTimeDeque <string> .Cons(s, queue1));
var head = RealTimeDeque <string> .Head(queue);
Assert.AreEqual("Three", head);
}
public void IncrementalHeadTest()
{
const string data = "One Two Three Four Five";
var queue = data.Split().Aggregate(RealTimeDeque <string> .Empty, (queue1, s) => RealTimeDeque <string> .Cons(s, queue1));
Assert.AreEqual("[2, {$}, {$}, 3, {$}, {$}]", DumpQueue(queue, false));
// After looking at the first element, the rest of the queue should be not created.
var head = RealTimeDeque <string> .Head(queue);
Assert.AreEqual("Five", head);
Assert.AreEqual("[2, {Five, $}, {Five, $}, 3, {$}, {$}]", DumpQueue(queue, false));
}
public void ConsHeadTailTest()
{
const string data = "One Two Three One Three";
var queue = data.Split().Aggregate(RealTimeDeque <string> .Empty, (queue1, s) => RealTimeDeque <string> .Cons(s, queue1));
foreach (var expected in data.Split().Reverse())
{
var actual = RealTimeDeque <string> .Head(queue);
Assert.AreEqual(expected, actual);
queue = RealTimeDeque <string> .Tail(queue);
}
Assert.IsTrue(RealTimeDeque <string> .IsEmpty(queue));
}
public void EmptyHeadTest()
{
var queue = RealTimeDeque <string> .Empty;
AssertThrows <ArgumentNullException>(() => RealTimeDeque <string> .Head(queue));
}