MailKit.Net.Smtp.SmtpClient.ExpandAsync C# (CSharp) Method

		public Task<InternetAddressList> ExpandAsync (string alias, CancellationToken cancellationToken = default (CancellationToken))
		{
			if (alias == null)
				throw new ArgumentNullException (nameof (alias));

			if (alias.Length == 0)
				throw new ArgumentException ("The alias cannot be empty.", nameof (alias));

			if (alias.IndexOfAny (new [] { '\r', '\n' }) != -1)
				throw new ArgumentException ("The alias cannot contain newline characters.", nameof (alias));

			return Task.Factory.StartNew (() => {
				lock (SyncRoot) {
					return Expand (alias, cancellationToken);
				}
			}, cancellationToken, TaskCreationOptions.None, TaskScheduler.Default);
		}

		public async void TestBasicFunctionality ()
		{
			var commands = new List<SmtpReplayCommand> ();
			commands.Add (new SmtpReplayCommand ("", "comcast-greeting.txt"));
			commands.Add (new SmtpReplayCommand ("EHLO unit-tests.mimekit.org\r\n", "comcast-ehlo.txt"));
			commands.Add (new SmtpReplayCommand ("AUTH PLAIN AHVzZXJuYW1lAHBhc3N3b3Jk\r\n", "comcast-auth-plain.txt"));
			commands.Add (new SmtpReplayCommand ("EHLO unit-tests.mimekit.org\r\n", "comcast-ehlo.txt"));
			commands.Add (new SmtpReplayCommand ("VRFY Smith\r\n", "rfc0821-vrfy.txt"));
			commands.Add (new SmtpReplayCommand ("EXPN Example-People\r\n", "rfc0821-expn.txt"));
			commands.Add (new SmtpReplayCommand ("NOOP\r\n", "comcast-noop.txt"));
			commands.Add (new SmtpReplayCommand ("MAIL FROM:<*****@*****.**>\r\n", "comcast-mail-from.txt"));
			commands.Add (new SmtpReplayCommand ("RCPT TO:<*****@*****.**>\r\n", "comcast-rcpt-to.txt"));
			commands.Add (new SmtpReplayCommand ("DATA\r\n", "comcast-data.txt"));
			commands.Add (new SmtpReplayCommand (".\r\n", "comcast-data-done.txt"));
			commands.Add (new SmtpReplayCommand ("MAIL FROM:<*****@*****.**>\r\n", "comcast-mail-from.txt"));
			commands.Add (new SmtpReplayCommand ("RCPT TO:<*****@*****.**>\r\n", "comcast-rcpt-to.txt"));
			commands.Add (new SmtpReplayCommand ("DATA\r\n", "comcast-data.txt"));
			commands.Add (new SmtpReplayCommand (".\r\n", "comcast-data-done.txt"));
			commands.Add (new SmtpReplayCommand ("MAIL FROM:<*****@*****.**>\r\n", "comcast-mail-from.txt"));
			commands.Add (new SmtpReplayCommand ("RCPT TO:<*****@*****.**>\r\n", "comcast-rcpt-to.txt"));
			commands.Add (new SmtpReplayCommand ("DATA\r\n", "comcast-data.txt"));
			commands.Add (new SmtpReplayCommand (".\r\n", "comcast-data-done.txt"));
			commands.Add (new SmtpReplayCommand ("MAIL FROM:<*****@*****.**>\r\n", "comcast-mail-from.txt"));
			commands.Add (new SmtpReplayCommand ("RCPT TO:<*****@*****.**>\r\n", "comcast-rcpt-to.txt"));
			commands.Add (new SmtpReplayCommand ("DATA\r\n", "comcast-data.txt"));
			commands.Add (new SmtpReplayCommand (".\r\n", "comcast-data-done.txt"));
			commands.Add (new SmtpReplayCommand ("QUIT\r\n", "comcast-quit.txt"));

			using (var client = new SmtpClient ()) {
				client.LocalDomain = "unit-tests.mimekit.org";

				try {
					client.ReplayConnect ("localhost", new SmtpReplayStream (commands));
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Connect: {0}", ex);
				}

				Assert.IsTrue (client.IsConnected, "Client failed to connect.");
				Assert.IsFalse (client.IsSecure, "IsSecure should be false.");

				Assert.IsTrue (client.Capabilities.HasFlag (SmtpCapabilities.Authentication), "Failed to detect AUTH extension");
				Assert.IsTrue (client.AuthenticationMechanisms.Contains ("LOGIN"), "Failed to detect the LOGIN auth mechanism");
				Assert.IsTrue (client.AuthenticationMechanisms.Contains ("PLAIN"), "Failed to detect the PLAIN auth mechanism");

				Assert.IsTrue (client.Capabilities.HasFlag (SmtpCapabilities.EightBitMime), "Failed to detect 8BITMIME extension");

				Assert.IsTrue (client.Capabilities.HasFlag (SmtpCapabilities.EnhancedStatusCodes), "Failed to detect ENHANCEDSTATUSCODES extension");

				Assert.IsTrue (client.Capabilities.HasFlag (SmtpCapabilities.Size), "Failed to detect SIZE extension");
				Assert.AreEqual (36700160, client.MaxSize, "Failed to parse SIZE correctly");

				Assert.IsTrue (client.Capabilities.HasFlag (SmtpCapabilities.StartTLS), "Failed to detect STARTTLS extension");

				Assert.Throws<ArgumentException> (() => client.Capabilities |= SmtpCapabilities.UTF8);

				Assert.AreEqual (100000, client.Timeout, "Timeout");
				client.Timeout *= 2;

				try {
					await client.AuthenticateAsync ("username", "password");
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Authenticate: {0}", ex);
				}

				try {
					await client.VerifyAsync ("Smith");
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Verify: {0}", ex);
				}

				try {
					await client.ExpandAsync ("Example-People");
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Expand: {0}", ex);
				}

				try {
					await client.NoOpAsync ();
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in NoOp: {0}", ex);
				}

				var message = CreateSimpleMessage ();
				var options = FormatOptions.Default;

				try {
					await client.SendAsync (message);
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Send: {0}", ex);
				}

				try {
					await client.SendAsync (message, message.From.Mailboxes.FirstOrDefault (), message.To.Mailboxes);
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Send: {0}", ex);
				}

				try {
					await client.SendAsync (options, message);
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Send: {0}", ex);
				}

				try {
					await client.SendAsync (options, message, message.From.Mailboxes.FirstOrDefault (), message.To.Mailboxes);
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Send: {0}", ex);
				}

				try {
					await client.DisconnectAsync (true);
				} catch (Exception ex) {
					Assert.Fail ("Did not expect an exception in Disconnect: {0}", ex);
				}

				Assert.IsFalse (client.IsConnected, "Failed to disconnect");
			}
		}