1 files changed, 121 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core.UnitTests/EffectTests.cs b/Xamarin.Forms.Core.UnitTests/EffectTests.cs
new file mode 100644
index 00000000..66399bc8
--- /dev/null
+++ b/Xamarin.Forms.Core.UnitTests/EffectTests.cs
@@ -0,0 +1,121 @@
+using System;
+using NUnit.Framework;
+
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Xamarin.Forms.Core.UnitTests
+{
+	[TestFixture]
+	public class EffectTests : BaseTestFixture
+	{
+		[Test]
+		public void ResolveSetsId ()
+		{
+			string id = "Unknown";
+			var effect = Effect.Resolve (id);
+			Assert.AreEqual (id, effect.ResolveId);
+		}
+
+		[Test]
+		public void UnknownIdReturnsNullEffect ()
+		{
+			var effect = Effect.Resolve ("Foo");
+			Assert.IsInstanceOf<NullEffect> (effect);
+		}
+
+		[Test]
+		public void SendAttachedSetsFlag ()
+		{
+			var effect = Effect.Resolve ("Foo");
+			effect.SendAttached ();
+			Assert.True (effect.IsAttached);
+		}
+
+		[Test]
+		public void SendDetachedUnsetsFlag ()
+		{
+			var effect = Effect.Resolve ("Foo");
+			effect.SendAttached ();
+			effect.SendDetached ();
+			Assert.False (effect.IsAttached);
+		}
+
+		[Test]
+		public void EffectLifecyclePreProvider ()
+		{
+			var effect = new CustomEffect ();
+			var element = new Label ();
+
+			element.Effects.Add (effect);
+			((IVisualElementController)element).EffectControlProvider = new EffectControlProvider ();
+
+			Assert.True (effect.IsAttached);
+			Assert.True (effect.OnAttachedCalled);
+			Assert.True (effect.Registered);
+			Assert.False (effect.OnDetachedCalled);
+
+			element.Effects.Remove (effect);
+			Assert.True (effect.OnDetachedCalled);
+		}
+
+		[Test]
+		public void EffectLifecyclePostProvider ()
+		{
+			var effect = new CustomEffect ();
+			var element = new Label ();
+
+			((IVisualElementController)element).EffectControlProvider = new EffectControlProvider ();
+			element.Effects.Add (effect);
+
+			Assert.True (effect.IsAttached);
+			Assert.True (effect.OnAttachedCalled);
+			Assert.True (effect.Registered);
+			Assert.False (effect.OnDetachedCalled);
+
+			element.Effects.Remove (effect);
+			Assert.True (effect.OnDetachedCalled);
+		}
+
+		[Test]
+		public void EffectsClearDetachesEffect ()
+		{
+			var effect = new CustomEffect ();
+			var element = new Label ();
+
+			((IVisualElementController)element).EffectControlProvider = new EffectControlProvider ();
+			element.Effects.Add (effect);
+
+			element.Effects.Clear ();
+
+			Assert.True (effect.OnDetachedCalled);
+		}
+
+		class EffectControlProvider : IEffectControlProvider
+		{
+			public void RegisterEffect (Effect effect)
+			{
+				var e = effect as CustomEffect;
+				if (e != null)
+					e.Registered = true;
+			}
+		}
+
+		class CustomEffect : Effect
+		{
+			public bool OnAttachedCalled;
+			public bool OnDetachedCalled;
+			public bool Registered;
+
+			protected override void OnAttached ()
+			{
+				OnAttachedCalled = true;
+			}
+
+			protected override void OnDetached ()
+			{
+				OnDetachedCalled = true;
+			}
+		}
+	}	
+}