1 files changed, 118 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core.UnitTests/MotionTests.cs b/Xamarin.Forms.Core.UnitTests/MotionTests.cs
new file mode 100644
index 00000000..acb764d7
--- /dev/null
+++ b/Xamarin.Forms.Core.UnitTests/MotionTests.cs
@@ -0,0 +1,118 @@
+using System;
+using System.Collections.Generic;
+using NUnit.Framework;
+
+namespace Xamarin.Forms.Core.UnitTests
+{
+	internal class BlockingTicker : Ticker
+	{
+		bool enabled;
+
+		protected override void EnableTimer ()
+		{
+			enabled = true;
+
+			while (enabled) {
+				SendSignals (16);
+			}
+		}
+
+		protected override void DisableTimer ()
+		{
+			enabled = false;
+		}
+	}
+
+	[TestFixture]
+	public class MotionTests : BaseTestFixture
+	{
+		[TestFixtureSetUp]
+		public void Init ()
+		{
+			Device.PlatformServices = new MockPlatformServices ();
+			Ticker.Default = new BlockingTicker ();
+		}
+
+		[TestFixtureTearDown]
+		public void End ()
+		{
+			Device.PlatformServices = null;
+			Ticker.Default = null;
+		}
+
+		[Test]
+		public void TestLinearTween ()
+		{
+			var tweener = new Tweener (250);
+
+			double value = 0;
+			int updates = 0;
+			tweener.ValueUpdated += (sender, args) => {
+				Assert.That (tweener.Value, Is.GreaterThanOrEqualTo (value));
+				value = tweener.Value;
+				updates++;
+			};
+			tweener.Start ();
+
+			Assert.That (updates, Is.GreaterThanOrEqualTo (10));
+		}
+
+		[Test]
+		public void ThrowsWithNullCallback ()
+		{
+			Assert.Throws<ArgumentNullException> (() => new View().Animate ("Test", (Action<double>) null));
+		}
+
+		[Test]
+		public void ThrowsWithNullTransform ()
+		{
+			Assert.Throws<ArgumentNullException> (() => new View().Animate<float> ("Test", null, f => { }));
+		}
+
+		[Test]
+		public void ThrowsWithNullSelf ()
+		{
+			Assert.Throws<ArgumentNullException> (() => AnimationExtensions.Animate (null, "Foo", d => (float)d, f => { }));
+		}
+
+		[Test]
+		public void Kinetic ()
+		{
+			var view = new View ();
+			var resultList = new List<Tuple<double, double>> ();
+			view.AnimateKinetic (
+				name: "Kinetics",
+				callback: (distance, velocity) => {
+					resultList.Add (new Tuple<double, double> (distance, velocity));
+					return true;
+				}, 
+				velocity: 100, 
+				drag: 1);
+
+			Assert.That (resultList, Is.Not.Empty);
+			int checkVelo = 100;
+			int dragStep = 16;
+
+			foreach (var item in resultList) {
+				checkVelo -= dragStep;
+				Assert.AreEqual (checkVelo, item.Item2);
+				Assert.AreEqual (checkVelo * dragStep, item.Item1);
+			}
+		}
+
+		[Test]
+		public void KineticFinished ()
+		{
+			var view = new View ();
+			bool finished = false;
+			view.AnimateKinetic (
+				name: "Kinetics",
+				callback: (distance, velocity) => true, 
+				velocity: 100, 
+				drag: 1,
+				finished: () => finished = true);
+
+			Assert.True (finished);
+		}
+	}
+}