diff --git a/Agent/Services/DeviceSocket.cs b/Agent/Services/DeviceSocket.cs
index e28f32edd..62be23ad1 100644
--- a/Agent/Services/DeviceSocket.cs
+++ b/Agent/Services/DeviceSocket.cs
@@ -58,7 +58,7 @@ public async Task Connect()
 
             var device = await DeviceInformation.Create(ConnectionInfo.DeviceID, ConnectionInfo.OrganizationID);
 
-            var result = await HubConnection.SendAsync<bool>("DeviceCameOnline", device);
+            var result = await HubConnection.InvokeAsync<bool>("DeviceCameOnline", device);
 
             if (!result)
             {
diff --git a/Tests/CaptureTests.cs b/Tests/CaptureTests.cs
new file mode 100644
index 000000000..950d36a69
--- /dev/null
+++ b/Tests/CaptureTests.cs
@@ -0,0 +1,54 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Remotely.ScreenCast.Core.Utilities;
+using Remotely.ScreenCast.Win.Services;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Drawing.Imaging;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Remotely.Tests
+{
+    [TestClass]
+    public class CaptureTests
+    {
+        [TestMethod]
+        [Ignore("Debug only.")]
+        public async Task Capture()
+        {
+            var capturer = new ScreenCapturerWin();
+            capturer.GetNextFrame();
+            Process.Start("msg", "* test");
+            await Task.Delay(500);
+            capturer.GetNextFrame();
+            var diffArea = ImageUtils.GetDiffArea(capturer.CurrentFrame, capturer.PreviousFrame, false);
+            if (diffArea.IsEmpty)
+            {
+                return;
+            }
+            using (var newImage = capturer.CurrentFrame.Clone(diffArea, PixelFormat.Format32bppArgb))
+            {
+                if (capturer.CaptureFullscreen)
+                {
+                    capturer.CaptureFullscreen = false;
+                }
+
+                newImage.Save(Path.Combine(Path.GetTempPath(), "!ImageDiff.jpg"), ImageFormat.Jpeg);
+                capturer.CurrentFrame.Save(Path.Combine(Path.GetTempPath(), "!Current.jpg"), ImageFormat.Jpeg);
+                capturer.PreviousFrame.Save(Path.Combine(Path.GetTempPath(), "!Previous.jpg"), ImageFormat.Jpeg);
+            }
+        }
+
+
+        private double MeasureCommand(Action command)
+        {
+            var stopwatch = Stopwatch.StartNew();
+            command.Invoke();
+            stopwatch.Stop();
+            Console.WriteLine($"Command time: {stopwatch.Elapsed.TotalMilliseconds}");
+            return stopwatch.Elapsed.TotalMilliseconds;
+        }
+    }
+}
diff --git a/Tests/Tests.csproj b/Tests/Tests.csproj
index bcf74192a..e1e3c9c6a 100644
--- a/Tests/Tests.csproj
+++ b/Tests/Tests.csproj
@@ -26,6 +26,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\Agent.Installer.Win\Agent.Installer.Win.csproj" />
+    <ProjectReference Include="..\ScreenCast.Win\ScreenCast.Win.csproj" />
     <ProjectReference Include="..\Server\Server.csproj" />
   </ItemGroup>