test: ItemsSource - Items sync

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml_Controls/Given_ListViewBase.Items.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Private.Infrastructure;
+#if NETFX_CORE
+using Uno.UI.Extensions;
+#elif __IOS__
+using UIKit;
+#elif __MACOS__
+using AppKit;
+#else
+using Uno.UI;
+#endif
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Controls.Primitives;
+using static Private.Infrastructure.TestServices;
+
+namespace Uno.UI.RuntimeTests.Tests.Windows_UI_Xaml_Controls
+{
+	[TestClass]
+	[Ignore("Items-ItemsSource sync not implemented yet")]
+	public partial class Given_ListViewBase_Items
+	{
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_Items_Added_Count_Updated()
+		{
+			var listView = new ListView();
+			listView.Items.Add(1);
+			Assert.AreEqual(1, listView.Items.Count);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_Items_Added_ItemsSource_Stays_Null()
+		{
+			var listView = new ListView();
+			listView.Items.Add(1);
+			Assert.IsNull(listView.ItemsSource);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Used_Items_NotNull()
+		{
+			var listView = new ListView();
+			listView.ItemsSource = new List<int>() { 1, 2 };
+			Assert.IsNotNull(listView.Items);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Unset_Items_NotNull()
+		{
+			var listView = new ListView();
+			listView.ItemsSource = new List<int>() { 1, 2 };
+			Assert.IsNotNull(listView.Items);
+			listView.ItemsSource = null;
+			Assert.IsNotNull(listView.Items);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Set_To_Empty_Items_Cleared()
+		{
+			var listView = new ListView();
+			listView.Items.Add(1);
+			listView.ItemsSource = new List<int>();
+			Assert.AreEqual(0, listView.Items.Count);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Unset_Items_Not_Cleared()
+		{
+			var listView = new ListView();
+			listView.Items.Add(1);
+			listView.ItemsSource = new List<int>() { 1, 3 };
+			listView.ItemsSource = null;
+			Assert.AreEqual(1, listView.Items.Count);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Unset_When_Already_Null_Items_Not_Cleared()
+		{
+			var listView = new ListView();
+			listView.Items.Add(1);
+			listView.ItemsSource = null;
+			Assert.AreEqual(1, listView.Items.Count);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Set_Items_Not_Modifiable()
+		{
+			var listView = new ListView();
+			listView.ItemsSource = new List<int>() { 1 };
+
+			var thrown = false;
+			try
+			{
+				listView.Items.Add(2);
+			}
+			catch (Exception) // Instead of Assert.ThrowsException as Uno throws InvalidOperationException, while UWP throws a generic Exception
+			{
+				thrown = true;
+			}
+
+			Assert.IsTrue(thrown);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Unset_Items_Modifiable()
+		{
+			var listView = new ListView();
+			listView.ItemsSource = new List<int>() { 1 };
+			listView.ItemsSource = null;
+			listView.Items.Add(2);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_List_Modified_Change_Is_Reflected()
+		{
+			var listView = new ListView();
+			var items = new List<int>() { 1 };
+			listView.ItemsSource = items;
+			Assert.AreEqual(1, listView.Items.Count);
+			items.Add(2);
+			Assert.AreEqual(2, listView.Items.Count);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_List_Modified_VectorChange_Not_Triggered()
+		{
+			var listView = new ListView();
+			var items = new List<int>() { 1 };
+			listView.ItemsSource = items;
+			Assert.AreEqual(1, listView.Items.Count);
+			var notified = false;
+			listView.Items.VectorChanged += (s, e) =>
+			{
+				notified = true;
+			};
+			items.Add(2);
+			Assert.AreEqual(2, listView.Items.Count);
+			Assert.IsFalse(notified);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Resets_ItemsCollection_Reference_Does_Not_Change()
+		{
+			var listView = new ListView();
+			var oldItems = listView.Items;
+
+			listView.ItemsSource = new List<int>() { 1 };
+
+			Assert.AreEqual(oldItems, listView.Items);
+
+			listView.ItemsSource = new ObservableCollection<int>() { 3, 1 };
+
+			Assert.AreEqual(oldItems, listView.Items);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_ObservableCollection_Modified_VectorChange_Not_Triggered()
+		{
+			var listView = new ListView();
+			var items = new ObservableCollection<int>() { 1 };
+			listView.ItemsSource = items;
+			Assert.AreEqual(1, listView.Items.Count);
+			var notified = false;
+			listView.Items.VectorChanged += (s, e) =>
+			{
+				notified = true;
+			};
+			items.Add(2);
+			Assert.AreEqual(2, listView.Items.Count);
+			Assert.IsTrue(notified);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Set_Items_Sync()
+		{
+			var listView = new ListView();
+
+			Assert.AreEqual(0, listView.Items.Count);
+
+			listView.ItemsSource = new List<int>() { 1, 2, 3 };
+
+			Assert.AreEqual(2, listView.Items[1]);
+		}
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Updated_Items_Sync()
+		{
+			var listView = new ListView();
+
+			Assert.AreEqual(0, listView.Items.Count);
+
+			var items = new List<int>() { 1, 2, 3 };
+			listView.ItemsSource = items;
+
+			Assert.AreEqual(2, listView.Items[1]);
+
+			items[1] = 6;
+
+			Assert.AreEqual(6, listView.Items[1]);
+		}
+
+
+		[TestMethod]
+		[RunsOnUIThread]
+		public async Task When_ItemsSource_Changes_Items_VectorChanged_Triggered()
+		{
+			var listView = new ListView();
+
+			var triggerCount = 0;
+			listView.Items.VectorChanged += (s, e) =>
+			{
+				triggerCount++;
+			};
+
+			listView.ItemsSource = new List<int>() { 1, 2 };
+
+			Assert.AreEqual(1, triggerCount);
+
+			listView.ItemsSource = new List<int>() { 3, 4 };
+
+			Assert.AreEqual(2, triggerCount);
+
+			listView.ItemsSource = null;
+
+			Assert.AreEqual(3, triggerCount);
+		}
+
+		[TestMethod]
+		public async Task When_ItemsSource_Enumerable_Changes_Items_Do_Not_Sync()
+		{
+			var listView = new ListView();
+
+			var items = new List<int>() { 0, 1, 2, 3, 4 };
+
+			listView.ItemsSource = items.Where(i => i % 2 == 0);
+
+			Assert.AreEqual(3, listView.Items.Count);
+
+			items.Add(5);
+			items.Add(6);
+
+			Assert.AreEqual(3, listView.Items.Count);
+		}
+
+
+		[TestMethod]
+		public async Task When_ItemsSource_ReadOnly_Items_ReadOnly_Does_Not_Change()
+		{
+			var listView = new ListView();
+			Assert.IsFalse(listView.Items.IsReadOnly);
+			listView.ItemsSource = new ReadOnlyCollection<int>(new List<int>());
+			Assert.IsFalse(listView.Items.IsReadOnly);
+		}
+
+		[TestMethod]
+		public async Task When_ItemsSource_ICollection_Items_Do_Not_Sync()
+		{
+			var listView = new ListView();
+			var items = new Dictionary<int, string>() { { 1, "Hello" } };
+
+			listView.ItemsSource = items;
+			Assert.AreEqual(1, listView.Items.Count);
+
+			items.Add(2, "World");
+			Assert.AreEqual(1, listView.Items.Count);
+		}
+	}
+}