BindingTests.cs

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

namespace Xamarin.Forms.Core.UnitTests
{
	[TestFixture]
	internal class BindingSystemTests : BaseTestFixture
	{
		[SetUp]
		public override void Setup()
		{
			base.Setup ();
			Device.PlatformServices = new MockPlatformServices ();
		}

		[TearDown]
		public override void TearDown()
		{
			base.TearDown ();
			Device.PlatformServices = null;
		}

		class BindableViewCell : ViewCell
		{
			public static readonly BindableProperty NameProperty = 
				BindableProperty.Create<BindableViewCell, string> (w => w.Name, "");

			public Label NameLabel { get; set; }

			public string Name
			{
				get { return (string) GetValue (NameProperty); }
				set { SetValue (NameProperty, value); }
			}

			public BindableViewCell ()
			{
				NameLabel = new Label {BindingContext = this};
				NameLabel.SetBinding (Label.TextProperty, new Binding ("Name"));
				View = NameLabel;
			}
		}

		[Test]
		public void RecursiveSettingInSystem ()
		{
			var tempObjects = new[] {
				new {Name = "Test1"},
				new {Name = "Test2"}
			};

			var template = new DataTemplate (typeof (BindableViewCell)) {
				Bindings = { {BindableViewCell.NameProperty, new Binding ("Name")} }
			};

			var cell1 = (Cell)template.CreateContent ();
			cell1.BindingContext = tempObjects[0];
			cell1.Parent = new ListView ();

			var cell2 = (Cell)template.CreateContent ();
			cell2.BindingContext = tempObjects[1];
			cell2.Parent = new ListView ();

			var viewCell1 = (BindableViewCell) cell1;
			var viewCell2 = (BindableViewCell) cell2;

			Assert.AreEqual ("Test1", viewCell1.Name);
			Assert.AreEqual ("Test2", viewCell2.Name);

			Assert.AreEqual ("Test1", viewCell1.NameLabel.Text);
			Assert.AreEqual ("Test2", viewCell2.NameLabel.Text);
		}
	}
}