diff --git a/osu.Game.Rulesets.Catch.Tests/CatchRateAdjustedDisplayDifficultyTest.cs b/osu.Game.Rulesets.Catch.Tests/CatchRateAdjustedDisplayDifficultyTest.cs
new file mode 100644
index 0000000000..f77ec64df3
--- /dev/null
+++ b/osu.Game.Rulesets.Catch.Tests/CatchRateAdjustedDisplayDifficultyTest.cs
@@ -0,0 +1,52 @@
+// 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 System.Collections.Generic;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Rulesets.Catch.Tests
+{
+    [TestFixture]
+    public class CatchRateAdjustedDisplayDifficultyTest
+    {
+        private static IEnumerable<float> difficultyValuesToTest()
+        {
+            for (float i = 0; i <= 10; i += 0.5f)
+                yield return i;
+        }
+
+        [TestCaseSource(nameof(difficultyValuesToTest))]
+        public void TestApproachRateIsUnchangedWithRateEqualToOne(float originalApproachRate)
+        {
+            var ruleset = new CatchRuleset();
+            var difficulty = new BeatmapDifficulty { ApproachRate = originalApproachRate };
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 1);
+
+            Assert.That(adjustedDifficulty.ApproachRate, Is.EqualTo(originalApproachRate));
+        }
+
+        [Test]
+        public void TestRateBelowOne()
+        {
+            var ruleset = new CatchRuleset();
+            var difficulty = new BeatmapDifficulty();
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 0.75);
+
+            Assert.That(adjustedDifficulty.ApproachRate, Is.EqualTo(1.67).Within(0.01));
+        }
+
+        [Test]
+        public void TestRateAboveOne()
+        {
+            var ruleset = new CatchRuleset();
+            var difficulty = new BeatmapDifficulty();
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 1.5);
+
+            Assert.That(adjustedDifficulty.ApproachRate, Is.EqualTo(7.67).Within(0.01));
+        }
+    }
+}
diff --git a/osu.Game.Rulesets.Osu.Tests/OsuRateAdjustedDisplayDifficultyTest.cs b/osu.Game.Rulesets.Osu.Tests/OsuRateAdjustedDisplayDifficultyTest.cs
new file mode 100644
index 0000000000..aa903205c8
--- /dev/null
+++ b/osu.Game.Rulesets.Osu.Tests/OsuRateAdjustedDisplayDifficultyTest.cs
@@ -0,0 +1,65 @@
+// 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 System.Collections.Generic;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    [TestFixture]
+    public class OsuRateAdjustedDisplayDifficultyTest
+    {
+        private static IEnumerable<float> difficultyValuesToTest()
+        {
+            for (float i = 0; i <= 10; i += 0.5f)
+                yield return i;
+        }
+
+        [TestCaseSource(nameof(difficultyValuesToTest))]
+        public void TestApproachRateIsUnchangedWithRateEqualToOne(float originalApproachRate)
+        {
+            var ruleset = new OsuRuleset();
+            var difficulty = new BeatmapDifficulty { ApproachRate = originalApproachRate };
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 1);
+
+            Assert.That(adjustedDifficulty.ApproachRate, Is.EqualTo(originalApproachRate));
+        }
+
+        [TestCaseSource(nameof(difficultyValuesToTest))]
+        public void TestOverallDifficultyIsUnchangedWithRateEqualToOne(float originalOverallDifficulty)
+        {
+            var ruleset = new OsuRuleset();
+            var difficulty = new BeatmapDifficulty { OverallDifficulty = originalOverallDifficulty };
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 1);
+
+            Assert.That(adjustedDifficulty.OverallDifficulty, Is.EqualTo(originalOverallDifficulty));
+        }
+
+        [Test]
+        public void TestRateBelowOne()
+        {
+            var ruleset = new OsuRuleset();
+            var difficulty = new BeatmapDifficulty();
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 0.75);
+
+            Assert.That(adjustedDifficulty.ApproachRate, Is.EqualTo(1.67).Within(0.01));
+            Assert.That(adjustedDifficulty.OverallDifficulty, Is.EqualTo(2.22).Within(0.01));
+        }
+
+        [Test]
+        public void TestRateAboveOne()
+        {
+            var ruleset = new OsuRuleset();
+            var difficulty = new BeatmapDifficulty();
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 1.5);
+
+            Assert.That(adjustedDifficulty.ApproachRate, Is.EqualTo(7.67).Within(0.01));
+            Assert.That(adjustedDifficulty.OverallDifficulty, Is.EqualTo(7.77).Within(0.01));
+        }
+    }
+}
diff --git a/osu.Game.Rulesets.Taiko.Tests/TaikoRateAdjustedDisplayDifficultyTest.cs b/osu.Game.Rulesets.Taiko.Tests/TaikoRateAdjustedDisplayDifficultyTest.cs
new file mode 100644
index 0000000000..4ab3f502ad
--- /dev/null
+++ b/osu.Game.Rulesets.Taiko.Tests/TaikoRateAdjustedDisplayDifficultyTest.cs
@@ -0,0 +1,52 @@
+// 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 System.Collections.Generic;
+using NUnit.Framework;
+using osu.Game.Beatmaps;
+
+namespace osu.Game.Rulesets.Taiko.Tests
+{
+    [TestFixture]
+    public class TaikoRateAdjustedDisplayDifficultyTest
+    {
+        private static IEnumerable<float> difficultyValuesToTest()
+        {
+            for (float i = 0; i <= 10; i += 0.5f)
+                yield return i;
+        }
+
+        [TestCaseSource(nameof(difficultyValuesToTest))]
+        public void TestOverallDifficultyIsUnchangedWithRateEqualToOne(float originalOverallDifficulty)
+        {
+            var ruleset = new TaikoRuleset();
+            var difficulty = new BeatmapDifficulty { OverallDifficulty = originalOverallDifficulty };
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 1);
+
+            Assert.That(adjustedDifficulty.OverallDifficulty, Is.EqualTo(originalOverallDifficulty));
+        }
+
+        [Test]
+        public void TestRateBelowOne()
+        {
+            var ruleset = new TaikoRuleset();
+            var difficulty = new BeatmapDifficulty();
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 0.75);
+
+            Assert.That(adjustedDifficulty.OverallDifficulty, Is.EqualTo(1.11).Within(0.01));
+        }
+
+        [Test]
+        public void TestRateAboveOne()
+        {
+            var ruleset = new TaikoRuleset();
+            var difficulty = new BeatmapDifficulty();
+
+            var adjustedDifficulty = ruleset.GetRateAdjustedDisplayDifficulty(difficulty, 1.5);
+
+            Assert.That(adjustedDifficulty.OverallDifficulty, Is.EqualTo(8.89).Within(0.01));
+        }
+    }
+}