that

src/Controls/tests/Core.UnitTests/TestClasses/ApplicationStub.cs

@@ -6,6 +6,10 @@ namespace Microsoft.Maui.Controls.Core.UnitTests
 	{
 		readonly List<IWindow> _windows = new List<IWindow>();
 
+		public IElementHandler Handler { get; set; }
+
+		public IElement Parent { get; set; }
+
 		public IReadOnlyList<IWindow> Windows => _windows.AsReadOnly();
 
 		public string Property { get; set; } = "Default";

src/Core/tests/Benchmarks/Stubs/ApplicationStub.cs

@@ -6,6 +6,10 @@ namespace Microsoft.Maui.Handlers.Benchmarks
 	{
 		readonly List<IWindow> _windows = new List<IWindow>();
 
+		public IElementHandler Handler { get; set; }
+
+		public IElement Parent { get; set; }
+
 		public IReadOnlyList<IWindow> Windows => _windows.AsReadOnly();
 
 		public IWindow CreateWindow(IActivationState state)

src/Core/tests/UnitTests/TestClasses/ApplicationStub.cs

@@ -6,6 +6,10 @@ namespace Microsoft.Maui.UnitTests
 	{
 		readonly List<IWindow> _windows = new List<IWindow>();
 
+		public IElementHandler Handler { get; set; }
+
+		public IElement Parent { get; set; }
+
 		public IReadOnlyList<IWindow> Windows => _windows.AsReadOnly();
 
 		public string Property { get; set; } = "Default";