diff --git a/SafeExamBrowser.Communication.UnitTests/Proxies/RuntimeProxyTests.cs b/SafeExamBrowser.Communication.UnitTests/Proxies/RuntimeProxyTests.cs
index e31cf23c..6ddd2fa4 100644
--- a/SafeExamBrowser.Communication.UnitTests/Proxies/RuntimeProxyTests.cs
+++ b/SafeExamBrowser.Communication.UnitTests/Proxies/RuntimeProxyTests.cs
@@ -10,11 +10,12 @@ using System;
 using System.ServiceModel;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
+using SafeExamBrowser.Communication.Proxies;
 using SafeExamBrowser.Contracts.Communication.Data;
 using SafeExamBrowser.Contracts.Communication.Proxies;
 using SafeExamBrowser.Contracts.Configuration;
 using SafeExamBrowser.Contracts.Logging;
-using SafeExamBrowser.Communication.Proxies;
+using SafeExamBrowser.Contracts.UserInterface.MessageBox;
 
 namespace SafeExamBrowser.Communication.UnitTests.Proxies
 {
@@ -167,6 +168,30 @@ namespace SafeExamBrowser.Communication.UnitTests.Proxies
 			Assert.IsFalse(communication.Success);
 		}
 
+		[TestMethod]
+		public void MustCorrectlySubmitMessageBoxResult()
+		{
+			var result = MessageBoxResult.Ok;
+			var requestId = Guid.NewGuid();
+
+			proxy.Setup(p => p.Send(It.IsAny<MessageBoxReplyMessage>())).Returns(new SimpleResponse(SimpleResponsePurport.Acknowledged));
+
+			var communication = sut.SubmitMessageBoxResult(requestId, result);
+
+			Assert.IsTrue(communication.Success);
+			proxy.Verify(p => p.Send(It.Is<MessageBoxReplyMessage>(m => m.Result == result && m.RequestId == requestId)), Times.Once);
+		}
+
+		[TestMethod]
+		public void MustFailIfMessageBoxResultTransmissionNotAcknowledged()
+		{
+			proxy.Setup(p => p.Send(It.IsAny<MessageBoxReplyMessage>())).Returns<Response>(null);
+
+			var communication = sut.SubmitMessageBoxResult(default(Guid), default(MessageBoxResult));
+
+			Assert.IsFalse(communication.Success);
+		}
+
 		[TestMethod]
 		public void MustExecuteOperationsFailsafe()
 		{
@@ -174,12 +199,14 @@ namespace SafeExamBrowser.Communication.UnitTests.Proxies
 
 			var client = sut.InformClientReady();
 			var configuration = sut.GetConfiguration();
+			var message = sut.SubmitMessageBoxResult(default(Guid), default(MessageBoxResult));
 			var password = sut.SubmitPassword(default(Guid), false);
 			var reconfiguration = sut.RequestReconfiguration(null);
 			var shutdown = sut.RequestShutdown();
 
 			Assert.IsFalse(client.Success);
 			Assert.IsFalse(configuration.Success);
+			Assert.IsFalse(message.Success);
 			Assert.IsFalse(password.Success);
 			Assert.IsFalse(reconfiguration.Success);
 			Assert.IsFalse(shutdown.Success);