maui-linux/Xamarin.Forms.Core.UnitTests/ContentFormUnitTests.cs

using System;
using System.Collections.Generic;
using System.Linq;
using NUnit.Framework;


namespace Xamarin.Forms.Core.UnitTests
{
	[TestFixture]
	public class ContentPageUnitTests : BaseTestFixture 
	{
		[Test]
		public void PropagateBindingContextBefore()
		{
			var stack = new StackLayout();

			var content = new ContentPage();
			content.Content = stack;

			object context = new object();
			content.BindingContext = context;

			Assert.AreSame (context, stack.BindingContext);
		}

		[Test]
		public void PropagateBindingContextAfter()
		{
			var stack = new StackLayout();

			var content = new ContentPage();

			object context = new object();
			content.BindingContext = context;

			content.Content = stack;

			Assert.AreSame (context, stack.BindingContext);
		}

		[Test]
		public void PropagateToolbarItemBindingContextPreAdd ()
		{
			var page = new ContentPage ();
			object context = "hello";

			var toolbarItem = new ToolbarItem ();
			page.ToolbarItems.Add (toolbarItem);

			page.BindingContext = context;

			Assert.AreEqual (context, toolbarItem.BindingContext);
		}

		[Test]
		public void PropagateToolbarItemBindingContextPostAdd ()
		{
			var page = new ContentPage ();
			object context = "hello";

			var toolbarItem = new ToolbarItem ();
			page.BindingContext = context;

			page.ToolbarItems.Add (toolbarItem);

			Assert.AreEqual (context, toolbarItem.BindingContext);
		}

        [Test]
        public void ContentPage_should_have_the_InternalChildren_correctly_when_Content_changed()
        {
            var sut = new ContentPage();
            IList<Element> internalChildren = ((IControlTemplated)sut).InternalChildren;
            internalChildren.Add(new VisualElement());
            internalChildren.Add(new VisualElement());
            internalChildren.Add(new VisualElement());

            var expected = new View();
            sut.Content = expected;

            Assert.AreEqual(1, internalChildren.Count);
            Assert.AreSame(expected, internalChildren[0]);
        }
	}
}