public void BuildCustomSubject_PreparesCorrectDestination() { // Arrange var fromAddress = new MailAddress("*****@*****.**"); var toAddress = new MailAddress("*****@*****.**"); var anotherAddress = new MailAddress("*****@*****.**"); // Act var builder = new EmailDestinationBuilder(fromAddress, new[] { toAddress, anotherAddress }, ServerName); string result = builder.Subject("Buzz").Build(); // Assert var expected = string.Format( "Type=Mail;From={0};To={1},{2};UseAttachment={3};CustomSubject={4};SmtpServer={5};UseSsl=true;Port=465;UseAuthentication=false;", fromAddress.Address, toAddress.Address, anotherAddress.Address, "false", "Buzz", ServerName); Assert.Equal(expected, result); }