1 files changed, 73 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core.UnitTests/NotifyCollectionChangedEventArgsExtensionsTests.cs b/Xamarin.Forms.Core.UnitTests/NotifyCollectionChangedEventArgsExtensionsTests.cs
new file mode 100644
index 00000000..e9acde45
--- /dev/null
+++ b/Xamarin.Forms.Core.UnitTests/NotifyCollectionChangedEventArgsExtensionsTests.cs
@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using NUnit.Framework;
+
+namespace Xamarin.Forms.Core.UnitTests
+{
+	[TestFixture]
+	public class NotifyCollectionChangedEventArgsExtensionsTests : BaseTestFixture
+	{
+		[Test]
+		public void Add()
+		{
+			List<string> applied = new List<string> { "foo", "bar", "baz" };
+
+			Action reset = () => Assert.Fail ("Reset should not be called");
+			Action<object, int, bool> insert = (o, i, create) => {
+				Assert.That (create, Is.True);
+				applied.Insert (i, (string) o);
+			};
+
+			Action<object, int> removeAt = (o, i) => applied.RemoveAt (i);
+
+			var items = new ObservableCollection<string> (applied);
+			items.CollectionChanged += (s, e) => e.Apply (insert, removeAt, reset);
+
+			items.Add ("monkey");
+
+			CollectionAssert.AreEqual (items, applied);
+		}
+
+		[Test]
+		public void Insert()
+		{
+			List<string> applied = new List<string> { "foo", "bar", "baz" };
+
+			Action reset = () => Assert.Fail ("Reset should not be called");
+			Action<object, int, bool> insert = (o, i, create) => {
+				Assert.That (create, Is.True);
+				applied.Insert (i, (string) o);
+			};
+			Action<object, int> removeAt = (o, i) => applied.RemoveAt (i);
+
+			var items = new ObservableCollection<string> (applied);
+			items.CollectionChanged += (s, e) => e.Apply (insert, removeAt, reset);
+
+			items.Insert (1, "monkey");
+
+			CollectionAssert.AreEqual (items, applied);
+		}
+
+		[Test]
+		public void Move()
+		{
+			List<string> applied = new List<string> { "foo", "bar", "baz" };
+
+			Action reset = () => Assert.Fail ("Reset should not be called");
+			Action<object, int, bool> insert = (o, i, create) => {
+				Assert.That (create, Is.False);
+				applied.Insert (i, (string) o);
+			};
+
+			Action<object, int> removeAt = (o, i) => applied.RemoveAt (i);
+
+			var items = new ObservableCollection<string> (applied);
+			items.CollectionChanged += (s, e) => e.Apply (insert, removeAt, reset);
+
+			items.Move (0, 2);
+
+			CollectionAssert.AreEqual (items, applied);
+		}
+	}
+}