From 7c29386717cc7f8c96668dc9fb4d970c7b43a17a Mon Sep 17 00:00:00 2001
From: smoogipoo <smoogipoo@smgi.me>
Date: Tue, 2 Feb 2021 18:01:33 +0900
Subject: [PATCH] Add failing tests

---
 osu.Game.Tests/Mods/ModUtilsTest.cs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/osu.Game.Tests/Mods/ModUtilsTest.cs b/osu.Game.Tests/Mods/ModUtilsTest.cs
index fdb441343a..b602c082bf 100644
--- a/osu.Game.Tests/Mods/ModUtilsTest.cs
+++ b/osu.Game.Tests/Mods/ModUtilsTest.cs
@@ -47,6 +47,29 @@ namespace osu.Game.Tests.Mods
             Assert.That(ModUtils.CheckCompatibleSet(new[] { mod1.Object, multiMod }), Is.False);
         }
 
+        [Test]
+        public void TestCompatibleMods()
+        {
+            var mod1 = new Mock<Mod>();
+            var mod2 = new Mock<Mod>();
+
+            // Test both orderings.
+            Assert.That(ModUtils.CheckCompatibleSet(new[] { mod1.Object, mod2.Object }), Is.True);
+            Assert.That(ModUtils.CheckCompatibleSet(new[] { mod2.Object, mod1.Object }), Is.True);
+        }
+
+        [Test]
+        public void TestIncompatibleThroughBaseType()
+        {
+            var mod1 = new Mock<Mod>();
+            var mod2 = new Mock<Mod>();
+            mod2.Setup(m => m.IncompatibleMods).Returns(new[] { mod1.Object.GetType().BaseType });
+
+            // Test both orderings.
+            Assert.That(ModUtils.CheckCompatibleSet(new[] { mod1.Object, mod2.Object }), Is.False);
+            Assert.That(ModUtils.CheckCompatibleSet(new[] { mod2.Object, mod1.Object }), Is.False);
+        }
+
         [Test]
         public void TestAllowedThroughMostDerivedType()
         {