fix failing test

mRemoteNGTests/AssemblyTestSetup.cs

@@ -0,0 +1,17 @@
+using System.Windows.Forms;
+using NUnit.Framework;
+
+
+// Dont put this in a namespace. Leaving it by itself tells NUnit
+// to run it on assembly load
+[SetUpFixture]
+public class AssemblyTestSetup
+{
+    [OneTimeSetUp]
+    public void AssemblySetup()
+    {
+        // ensure window options set before any test window created
+        Application.EnableVisualStyles();
+        Application.SetCompatibleTextRenderingDefault(false);
+    }
+}

mRemoteNGTests/UI/Controls/TextBoxExtensionsTestForm.cs

@@ -6,7 +6,6 @@ namespace mRemoteNGTests.UI.Controls
     {
         public TextBoxExtensionsTestForm()
         {
-            Application.EnableVisualStyles();
             InitializeComponent();
         }
     }

mRemoteNGTests/mRemoteNGTests.csproj

@@ -109,6 +109,7 @@
   </Choose>
   <ItemGroup>
     <Compile Include="App\UpdaterTests.cs" />
+    <Compile Include="AssemblyTestSetup.cs" />
     <Compile Include="BinaryFileTests.cs" />
     <Compile Include="Config\Connections\Multiuser\ConnectionsUpdateAvailableEventArgsTests.cs" />
     <Compile Include="Config\DataProviders\FileBackupCreatorTests.cs" />