Fixed more unit tests

UnitTests/View/Layout/SetRelativeLayoutTests.cs

@@ -246,6 +246,7 @@ public class SetRelativeLayoutTests
             Height = 1
         };
         superView.Add (testView);
+        superView.Layout ();
         testView.SetRelativeLayout (superView.Frame.Size);
         Assert.Equal (4, testView.Frame.X);
         Assert.Equal (4, testView.Frame.Y);

UnitTests/View/Layout/ToScreenTests.cs

@@ -23,6 +23,8 @@ public class ToScreenTests (ITestOutputHelper output)
     public void FrameToScreen_NoSuperView (int frameX, int frameY, int expectedScreenX, int expectedScreenY)
     {
         var view = new View { X = frameX, Y = frameY, Width = 10, Height = 10 };
+        view.Layout ();
+
         var expected = new Rectangle (expectedScreenX, expectedScreenY, 10, 10);
         Rectangle actual = view.FrameToScreen ();
         Assert.Equal (expected, actual);
@@ -48,6 +50,8 @@ public class ToScreenTests (ITestOutputHelper output)
 
         var view = new View { X = frameX, Y = frameY, Width = 10, Height = 10 };
         super.Add (view);
+        super.Layout ();
+
         var expected = new Rectangle (expectedScreenX, expectedScreenY, 10, 10);
         Rectangle actual = view.FrameToScreen ();
         Assert.Equal (expected, actual);
@@ -337,6 +341,7 @@ public class ToScreenTests (ITestOutputHelper output)
             Width = 10,
             Height = 10
         };
+        view.Layout ();
         view.SetContentSize (new (20, 20));
 
         Point testPoint = new (0, 0);
@@ -633,10 +638,12 @@ public class ToScreenTests (ITestOutputHelper output)
             Height = 10,
             ViewportSettings = ViewportSettings.AllowNegativeLocation
         };
+        view.Layout ();
 
         Rectangle testRect = new Rectangle (0, 0, 1, 1);
         Assert.Equal (new Point (0, 0), view.ViewportToScreen (testRect).Location);
         view.Viewport = view.Viewport with { Location = new Point (1, 1) };
+
         Assert.Equal (new Rectangle (1, 1, 10, 10), view.Viewport);
         Assert.Equal (new Point (0, 0), view.ViewportToScreen (testRect).Location);
     }
@@ -654,6 +661,7 @@ public class ToScreenTests (ITestOutputHelper output)
 
         var view = new View ();
         view.Frame = frame;
+        view.Layout ();
 
         // Act
         var screen = view.ViewportToScreen (new Point (viewportX, 0));

UnitTests/View/Layout/ViewportTests.cs

@@ -160,6 +160,7 @@ public class ViewportTests (ITestOutputHelper output)
             Height = 10,
             ViewportSettings = ViewportSettings.AllowNegativeLocation
         };
+        view.Layout ();
 
         Assert.Equal (new Rectangle (0, 0, 10, 10), view.Frame);
 
@@ -237,6 +238,7 @@ public class ViewportTests (ITestOutputHelper output)
             Width = viewWidth,
             Height = viewHeight,
         };
+        view.Layout ();
         var newViewport = new Rectangle (viewportX, viewportY, viewWidth, viewHeight);
 
         // Act