public void op_ToString(string expected,
                                int urn,
                                int umr)
        {
            var actual = new PostalAddressFileKey(urn, umr).ToString();

            Assert.Equal(expected, actual);
        }
        public void opImplicit_string_PostalAddressFileKey()
        {
            const string expected = "0·0";
            string actual = new PostalAddressFileKey();

            Assert.Equal(expected, actual);
        }
        public void op_GetHashCode()
        {
            var expected = "0·0".GetHashCode();
            var actual = new PostalAddressFileKey().GetHashCode();

            Assert.Equal(expected, actual);
        }