Add test coverage of SubmittableScore serialisation to (roughly) match spec

osu.Game.Tests/Online/TestSubmittableScoreJsonSerialization.cs

@@ -0,0 +1,40 @@
+// 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 Newtonsoft.Json;
+using NUnit.Framework;
+using osu.Game.IO.Serialization;
+using osu.Game.Online.Solo;
+using osu.Game.Tests.Resources;
+
+namespace osu.Game.Tests.Online
+{
+    /// <summary>
+    /// Basic testing to ensure our attribute-based naming is correctly working.
+    /// </summary>
+    [TestFixture]
+    public class TestSubmittableScoreJsonSerialization
+    {
+        [Test]
+        public void TestScoreSerialisationViaExtensionMethod()
+        {
+            var score = new SubmittableScore(TestResources.CreateTestScoreInfo());
+
+            string serialised = score.Serialize();
+
+            Assert.That(serialised, Contains.Substring("large_tick_hit"));
+            Assert.That(serialised, Contains.Substring("\"rank\": \"S\""));
+        }
+
+        [Test]
+        public void TestScoreSerialisationWithoutSettings()
+        {
+            var score = new SubmittableScore(TestResources.CreateTestScoreInfo());
+
+            string serialised = JsonConvert.SerializeObject(score);
+
+            Assert.That(serialised, Contains.Substring("large_tick_hit"));
+            Assert.That(serialised, Contains.Substring("\"rank\":\"S\""));
+        }
+    }
+}