public void Find()
{
Assert.IsFalse(list.Find(pred, out int i));
list.AddAll(new int[] { 4, 22, 67, 37 });
Assert.IsFalse(list.Find(pred, out i));
list.AddAll(new int[] { 45, 122, 675, 137 });
Assert.IsTrue(list.Find(pred, out i));
Assert.AreEqual(45, i);
}
