public void ToString_Example6ReturnsFormattedIrdNumber()
        {
            // arrange
            var irdNumber = new IrdNumber(9125568);

            // act
            irdNumber.ToString();
        }
        public void ToString_Example3ReturnsFormattedIrdNumber()
        {
            // arrange
            var irdNumber = new IrdNumber(49098576);

            // act
            var result = irdNumber.ToString();

            // assert
            Assert.AreEqual("49-098-576", result);
        }
        public void ToString_Example2ReturnsFormattedIrdNumber()
        {
            // arrange
            var irdNumber = new IrdNumber(35901981);

            // act
            var result = irdNumber.ToString();

            // assert
            Assert.AreEqual("35-901-981", result);
        }
        public void ToString_Example5ReturnsFormattedIrdNumber()
        {
            // arrange
            var irdNumber = new IrdNumber(136410133);

            // act
            var result = irdNumber.ToString();

            // assert
            Assert.AreEqual("136-410-133", result);
        }