private void TestTransform(int count, int[] expect, int commonTailLength, params XfAction[] actions)
{
WList <int> list = new WList <int>();
for (int i = 0; i < count; i++)
{
list.Add(i + 1);
}
int counter = 0;
WList <int> result =
list.Transform(delegate(int i, ref int item) {
if (i >= 0)
{
Assert.AreEqual(list[i], item);
}
item *= 10;
return(actions[counter++]);
});
Assert.AreEqual(counter, actions.Length);
ExpectList(result, expect);
Assert.That(result.WithoutLast(result.Count - commonTailLength)
== list.WithoutLast(list.Count - commonTailLength));
// Try to ensure there's no shared mutable memory by trashing the
// result starting at the head, and verifying the original list
for (int i = result.Count - 1; i >= 0; i--)
{
result[i] = -1;
}
Assert.AreEqual(count, list.Count);
for (int i = 0; i < count; i++)
{
Assert.AreEqual(i + 1, list[i]);
}
}
