Improve testability of API

osu.Game/Online/API/APIAccess.cs

@@ -7,7 +7,6 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Net;
 using System.Threading;
-using osu.Framework;
 using osu.Framework.Configuration;
 using osu.Framework.Logging;
 using osu.Framework.Threading;
@@ -16,7 +15,7 @@ using osu.Game.Users;
 
 namespace osu.Game.Online.API
 {
-    public class APIAccess : IUpdateable
+    public class APIAccess : IAPIProvider
     {
         private readonly OAuth authentication;
 
@@ -34,7 +33,7 @@ namespace osu.Game.Online.API
 
         public string Password;
 
-        public Bindable<User> LocalUser = new Bindable<User>(createGuestUser());
+        public Bindable<User> LocalUser { get; } = new Bindable<User>(createGuestUser());
 
         public string Token
         {

osu.Game/Online/API/DummyAPIAccess.cs

@@ -0,0 +1,31 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Configuration;
+using osu.Game.Users;
+
+namespace osu.Game.Online.API
+{
+    public class DummyAPIAccess : IAPIProvider
+    {
+        public Bindable<User> LocalUser { get; } = new Bindable<User>(new User
+        {
+            Username = @"Dummy",
+            Id = 1,
+        });
+
+        public bool IsLoggedIn => true;
+
+        public void Update()
+        {
+        }
+
+        public virtual void Queue(APIRequest request)
+        {
+        }
+
+        public void Register(IOnlineComponent component)
+        {
+        }
+    }
+}

osu.Game/Online/API/IAPIProvider.cs

@@ -0,0 +1,34 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework;
+using osu.Framework.Configuration;
+using osu.Game.Users;
+
+namespace osu.Game.Online.API
+{
+    public interface IAPIProvider : IUpdateable
+    {
+        /// <summary>
+        /// The local user.
+        /// </summary>
+        Bindable<User> LocalUser { get; }
+
+        /// <summary>
+        /// Returns whether the local user is logged in.
+        /// </summary>
+        bool IsLoggedIn { get; }
+
+        /// <summary>
+        /// Queue a new request.
+        /// </summary>
+        /// <param name="request">The request to perform.</param>
+        void Queue(APIRequest request);
+
+        /// <summary>
+        /// Register a component to receive state changes.
+        /// </summary>
+        /// <param name="component">The component to register.</param>
+        void Register(IOnlineComponent component);
+    }
+}

osu.Game/OsuGameBase.cs

@@ -105,6 +105,7 @@ namespace osu.Game
                 Username = LocalConfig.Get<string>(OsuSetting.Username),
                 Token = LocalConfig.Get<string>(OsuSetting.Token)
             });
+            dependencies.CacheAs<IAPIProvider>(API);
 
             dependencies.Cache(RulesetStore = new RulesetStore(contextFactory));
             dependencies.Cache(FileStore = new FileStore(contextFactory, Host.Storage));

osu.Game/osu.Game.csproj

@@ -281,6 +281,8 @@
     <Compile Include="Database\SingletonContextFactory.cs" />
     <Compile Include="Graphics\Containers\LinkFlowContainer.cs" />
     <Compile Include="Graphics\Textures\LargeTextureStore.cs" />
+    <Compile Include="Online\API\DummyAPIAccess.cs" />
+    <Compile Include="Online\API\IAPIProvider.cs" />
     <Compile Include="Online\API\Requests\GetUserRequest.cs" />
     <Compile Include="Migrations\20180125143340_Settings.cs" />
     <Compile Include="Migrations\20180125143340_Settings.Designer.cs">