Add test coverage

osu.Game.Rulesets.Catch.Tests/Mods/TestSceneCatchModNoScope.cs

@@ -18,6 +18,36 @@ namespace osu.Game.Rulesets.Catch.Tests.Mods
     {
         protected override Ruleset CreatePlayerRuleset() => new CatchRuleset();
 
+        [Test]
+        public void TestAlwaysHidden()
+        {
+            CreateModTest(new ModTestData
+            {
+                Mod = new CatchModNoScope
+                {
+                    HiddenComboCount = { Value = 0 },
+                },
+                Autoplay = true,
+                PassCondition = () => Player.ScoreProcessor.Combo.Value == 2,
+                Beatmap = new Beatmap
+                {
+                    HitObjects = new List<HitObject>
+                    {
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X * 0.5f,
+                            StartTime = 1000,
+                        },
+                        new Fruit
+                        {
+                            X = CatchPlayfield.CENTER_X * 1.5f,
+                            StartTime = 2000,
+                        }
+                    }
+                }
+            });
+        }
+
         [Test]
         public void TestVisibleDuringBreak()
         {