Add test coverage of login dialog

osu.Game.Tests/Visual/Menus/TestSceneLoginPanel.cs

@@ -0,0 +1,41 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Graphics;
+using osu.Framework.Testing;
+using osu.Game.Graphics.UserInterface;
+using osu.Game.Overlays.Login;
+
+namespace osu.Game.Tests.Visual.Menus
+{
+    [TestFixture]
+    public class TestSceneLoginPanel : OsuManualInputManagerTestScene
+    {
+        private LoginPanel loginPanel;
+
+        [SetUpSteps]
+        public void SetUpSteps()
+        {
+            AddStep("create login dialog", () =>
+            {
+                Add(loginPanel = new LoginPanel
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Width = 0.5f,
+                });
+            });
+        }
+
+        [Test]
+        public void TestBasicLogin()
+        {
+            AddStep("logout", () => API.Logout());
+
+            AddStep("enter password", () => loginPanel.ChildrenOfType<OsuPasswordTextBox>().First().Text = "password");
+            AddStep("submit", () => loginPanel.ChildrenOfType<OsuButton>().First(b => b.Text.ToString() == "Sign in").TriggerClick());
+        }
+    }
+}