Add test case for the editor

osu.Game/Tests/Visual/TestCaseEditor.cs

@@ -0,0 +1,47 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Collections.Generic;
+using osu.Framework.Allocation;
+using osu.Framework.MathUtils;
+using osu.Game.Beatmaps;
+using osu.Game.Screens.Edit;
+
+namespace osu.Game.Tests.Visual
+{
+    public class TestCaseEditor : OsuTestCase
+    {
+        public override IReadOnlyList<Type> RequiredTypes => new[] { typeof(Editor) };
+
+        private readonly Random rng;
+
+        private BeatmapManager beatmaps;
+        private OsuGameBase osuGame;
+
+        public TestCaseEditor()
+        {
+            rng = new Random(1337);
+
+            Add(new Editor());
+            AddStep("Next beatmap", nextBeatmap);
+        }
+
+        [BackgroundDependencyLoader]
+        private void load(OsuGameBase osuGame, BeatmapManager beatmaps)
+        {
+            this.osuGame = osuGame;
+            this.beatmaps = beatmaps;
+        }
+
+        private void nextBeatmap()
+        {
+            var sets = beatmaps.GetAllUsableBeatmapSets();
+            if (sets.Count == 0)
+                return;
+
+            BeatmapInfo info = sets[rng.Next(0, sets.Count)].Beatmaps[0];
+            osuGame.Beatmap.Value = beatmaps.GetWorkingBeatmap(info);
+        }
+    }
+}