public void TestCase2_OutOfRange()
 => InsertingNumbers.InsertNumber(8, 15, 7, 1);
        public void TestingInsertNumber3()
        {
            int actual = InsertingNumbers.InsertNumber(8, 15, 3, 8);

            Assert.AreEqual(120, actual);
        }
 public void TestCase1_OutOfRange()
 => InsertingNumbers.InsertNumber(8, 15, -7, 0);
        public void TestingInsertNumber2()
        {
            int actual = InsertingNumbers.InsertNumber(8, 15, 0, 0);

            Assert.AreEqual(9, actual);
        }