maui-linux/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla31395.cs

using System;

using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;

#if UITEST
using Xamarin.UITest;
using NUnit.Framework;
#endif

namespace Xamarin.Forms.Controls.Issues
{
	[Preserve (AllMembers = true)]
	[Issue (IssueTracker.Bugzilla, 31395, "Crash when switching MainPage and using a Custom Render")]
	public class Bugzilla31395 : TestContentPage // or TestMasterDetailPage, etc ...
	{
		protected override void Init ()
		{
			Content = new CustomContentView { // Replace with ContentView and everything works fine
				Content = new StackLayout {
					VerticalOptions = LayoutOptions.Center,
					Children = {
						new Button {
							Text = "Switch Main Page",
							Command = new Command (() => SwitchMainPage ())
						}
					}
				}
			};
		}

		void SwitchMainPage ()
		{
			Application.Current.MainPage = new ContentPage { Content = new Label { Text = "Hello" } };
		}

		public class CustomContentView : ContentView
		{
			
		}

		#if UITEST
		[Test]
		public void Bugzilla31395Test ()
		{
			RunningApp.WaitForElement (q => q.Marked ("Switch Main Page"));
			Assert.DoesNotThrow (() => {
				RunningApp.Tap (c => c.Marked ("Switch Main Page"));
			});
			RunningApp.WaitForElement (q => q.Marked ("Hello"));
		}
		#endif
	}
}