public void GetAddressStrFromObject()
        {
            // Arrange
            ExternalService service = new ExternalService();

            var userModel = new User()
            {
                FirstName = "TestFN",
                LastName = "TestLN",
                Email = "*****@*****.**",
                StreetAddress = "TestSA",
                City = "TestCity",
                State = "TestState",
                Zip = "99999"
            };

            // Act
            var result = service.GetAddressStrFromObject(userModel);

            // Assert
            Assert.IsNotNull(result);
            Assert.AreEqual(result, "TestSA, TestCity, TestState 99999");
        }