public void TestAllD20Values() { // create D20 var d = DiceFactory.CreateD20(); // populate "not yet found" list List <int> notFound = new List <int>(); notFound.AddRange(new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 }); // attempt to find each value for (int i = 1; i < 1000; i++) // arbitrary limit of 10 maximum tries { int result = d.Roll(); // 1 To 20 notFound.Remove(result); if (notFound.Count <= 0) { break; // all found } } // test Assert.AreEqual <int>(0, notFound.Count, "Some values were not rolled on a d20."); }