Notifications can be tested

Notification ImplementationType was added for showing in UI (Humanized/Title cased of Implementation)

NzbDrone.Core/Notifications/Email/EmailService.cs

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+using System;
+using System.Net;
+using System.Net.Mail;
+using NLog;
+using NzbDrone.Common.Messaging;
+using Omu.ValueInjecter;
+
+namespace NzbDrone.Core.Notifications.Email
+{
+    public interface IEmailService
+    {
+        void SendEmail(EmailSettings settings, string subject, string body, bool htmlBody = false);
+    }
+
+    public class EmailService : IEmailService, IExecute<TestEmailCommand>
+    {
+        private readonly Logger _logger;
+
+        public EmailService(Logger logger)
+        {
+            _logger = logger;
+        }
+
+        public void SendEmail(EmailSettings settings, string subject, string body, bool htmlBody = false)
+        {
+            var email = new MailMessage();
+            email.From = new MailAddress(settings.From);
+            
+            email.To.Add(settings.To);
+
+            email.Subject = subject;
+            email.Body = body;
+            email.IsBodyHtml = htmlBody;
+
+            NetworkCredential credentials = null;
+
+            if (!String.IsNullOrWhiteSpace(settings.Username))
+                credentials = new NetworkCredential(settings.Username, settings.Password);
+
+            try
+            {
+                Send(email, settings.Server, settings.Port, settings.Ssl, credentials);
+            }
+            catch(Exception ex)
+            {
+                _logger.Error("Error sending email. Subject: {0}", email.Subject);
+                _logger.TraceException(ex.Message, ex);
+            }
+        }
+
+        private void Send(MailMessage email, string server, int port, bool ssl, NetworkCredential credentials)
+        {
+            try
+            {
+                var smtp = new SmtpClient(server, port);
+
+                smtp.EnableSsl = ssl;
+
+                smtp.Credentials = credentials;
+
+                smtp.Send(email);
+            }
+
+            catch (Exception ex)
+            {
+                _logger.ErrorException("There was an error sending an email.", ex);
+                throw;
+            }
+        }
+
+        public void Execute(TestEmailCommand message)
+        {
+            var settings = new EmailSettings();
+            settings.InjectFrom(message);
+
+            var body = "Success! You have properly configured your email notification settings";
+
+            SendEmail(settings, "NzbDrone - Test Notification", body);
+        }
+    }
+}