public void FilterDigit_8() { List <int> initialList = new List <int>() { 1, 17, 45, 65, 76, 725, 3, 9, 7, 37 }; List <int> expected = new List <int>() { }; NumberClass numberClass = new NumberClass(); List <int> actual = numberClass.FilterDigit(initialList, 8); CollectionAssert.AreEqual(expected, actual); }