Add equality check test to ensure correct values

osu.Game.Tests/NonVisual/BeatmapSetInfoEqualityTest.cs

@@ -0,0 +1,48 @@
+// 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 NUnit.Framework;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Tests.NonVisual
+{
+    [TestFixture]
+    public class BeatmapSetInfoEqualityTest
+    {
+        [Test]
+        public void TestOnlineWithOnline()
+        {
+            var ourInfo = new BeatmapSetInfo { OnlineBeatmapSetID = 123 };
+            var otherInfo = new BeatmapSetInfo { OnlineBeatmapSetID = 123 };
+
+            Assert.AreEqual(ourInfo, otherInfo);
+        }
+
+        [Test]
+        public void TestDatabasedWithDatabased()
+        {
+            var ourInfo = new BeatmapSetInfo { ID = 123 };
+            var otherInfo = new BeatmapSetInfo { ID = 123 };
+
+            Assert.AreEqual(ourInfo, otherInfo);
+        }
+
+        [Test]
+        public void TestDatabasedWithOnline()
+        {
+            var ourInfo = new BeatmapSetInfo { ID = 123, OnlineBeatmapSetID = 12 };
+            var otherInfo = new BeatmapSetInfo { OnlineBeatmapSetID = 12 };
+
+            Assert.AreEqual(ourInfo, otherInfo);
+        }
+
+        [Test]
+        public void TestCheckNullID()
+        {
+            var ourInfo = new BeatmapSetInfo { Status = BeatmapSetOnlineStatus.Loved };
+            var otherInfo = new BeatmapSetInfo { Status = BeatmapSetOnlineStatus.Approved };
+
+            Assert.AreNotEqual(ourInfo, otherInfo);
+        }
+    }
+}