Fix failing tests.

src/Avalonia.Visuals/Media/Immutable/ImmutableDashStyle.cs

@@ -28,7 +28,7 @@ namespace Avalonia.Media.Immutable
         public double Offset { get; }
 
         /// <inheritdoc/>
-        public override bool Equals(object obj) => Equals(this, obj as IDashStyle);
+        public override bool Equals(object obj) => Equals(obj as IDashStyle);
 
         /// <inheritdoc/>
         public bool Equals(IDashStyle other)

tests/Avalonia.Visuals.UnitTests/Media/PenTests.cs

@@ -45,20 +45,20 @@ namespace Avalonia.Visuals.UnitTests.Media
         }
 
         [Fact]
-        public void Equality_Is_Implemented_Between_Mutable_And_Immutable_Pens()
+        public void Equality_Is_Implemented_Between_Immutable_And_Mmutable_Pens()
         {
             var brush = new SolidColorBrush(Colors.Red);
-            var target1 = new Pen(
+            var target1 = new ImmutablePen(
                 brush: brush,
                 thickness: 2,
-                dashStyle: DashStyle.Dash,
+                dashStyle: (ImmutableDashStyle)DashStyle.Dash,
                 lineCap: PenLineCap.Round,
                 lineJoin: PenLineJoin.Round,
                 miterLimit: 21);
-            var target2 = new ImmutablePen(
+            var target2 = new Pen(
                 brush: brush,
                 thickness: 2,
-                dashStyle: (ImmutableDashStyle)DashStyle.Dash,
+                dashStyle: DashStyle.Dash,
                 lineCap: PenLineCap.Round,
                 lineJoin: PenLineJoin.Round,
                 miterLimit: 21);
@@ -70,17 +70,17 @@ namespace Avalonia.Visuals.UnitTests.Media
         public void Equality_Is_Implemented_Between_Mutable_And_Immutable_DashStyles()
         {
             var brush = new SolidColorBrush(Colors.Red);
-            var target1 = new Pen(
+            var target1 = new ImmutablePen(
                 brush: brush,
                 thickness: 2,
-                dashStyle: new DashStyle(new[] { 0.1, 0.2 }, 5),
+                dashStyle: new ImmutableDashStyle(new[] { 0.1, 0.2 }, 5),
                 lineCap: PenLineCap.Round,
                 lineJoin: PenLineJoin.Round,
                 miterLimit: 21);
-            var target2 = new ImmutablePen(
+            var target2 = new Pen(
                 brush: brush,
                 thickness: 2,
-                dashStyle: new ImmutableDashStyle(new[] { 0.1, 0.2 }, 5),
+                dashStyle: new DashStyle(new[] { 0.1, 0.2 }, 5),
                 lineCap: PenLineCap.Round,
                 lineJoin: PenLineJoin.Round,
                 miterLimit: 21);