Add a very basic popup testcase

osu.Game.Tests/Visual/TestCasePopupDialog.cs

@@ -0,0 +1,37 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Graphics;
+using osu.Game.Graphics;
+using osu.Game.Overlays.Dialog;
+
+namespace osu.Game.Tests.Visual
+{
+    public class TestCasePopupDialog : OsuTestCase
+    {
+        public TestCasePopupDialog()
+        {
+            var popup = new PopupDialog
+            {
+                RelativeSizeAxes = Axes.Both,
+                State = Framework.Graphics.Containers.Visibility.Visible,
+                Icon = FontAwesome.fa_assistive_listening_systems,
+                HeaderText = @"This is a test popup",
+                BodyText = "I can say lots of stuff and even wrap my words!",
+                Buttons = new PopupDialogButton[]
+                {
+                    new PopupDialogCancelButton
+                    {
+                        Text = @"Yes. That you can.",
+                    },
+                    new PopupDialogOkButton
+                    {
+                        Text = @"You're a fake!",
+                    },
+                }
+            };
+
+            Add(popup);
+        }
+    }
+}

osu.Game.Tests/osu.Game.Tests.csproj

@@ -134,6 +134,7 @@
     <Compile Include="Visual\TestCaseOsuGame.cs" />
     <Compile Include="Visual\TestCasePlaybackControl.cs" />
     <Compile Include="Visual\TestCasePlaySongSelect.cs" />
+    <Compile Include="Visual\TestCasePopupDialog.cs" />
     <Compile Include="Visual\TestCaseRankGraph.cs" />
     <Compile Include="Visual\TestCaseReplay.cs" />
     <Compile Include="Visual\TestCaseReplaySettingsOverlay.cs" />