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); }