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using System;
using NUnit.Framework;
namespace Xamarin.Forms.Core.UnitTests
{
class MockBehavior<T> : Behavior<T> where T:BindableObject
{
public static int AttachCount { get; set; }
public bool attached;
public bool detached;
protected override void OnAttachedTo (BindableObject bindable)
{
base.OnAttachedTo (bindable);
attached = true;
AttachCount++;
AssociatedObject = bindable;
}
protected override void OnDetachingFrom (BindableObject bindable)
{
AttachCount--;
detached = true;
base.OnDetachingFrom (bindable);
AssociatedObject = null;
}
public BindableObject AssociatedObject {get;set;}
}
[TestFixture]
public class BehaviorTest : BaseTestFixture
{
[Test]
public void AttachAndDetach ()
{
var behavior = new MockBehavior<MockBindable> ();
var bindable = new MockBindable ();
Assert.False (behavior.attached);
Assert.False (behavior.detached);
Assert.Null (behavior.AssociatedObject);
((IAttachedObject)behavior).AttachTo (bindable);
Assert.True (behavior.attached);
Assert.False (behavior.detached);
Assert.AreSame (bindable, behavior.AssociatedObject);
((IAttachedObject)behavior).DetachFrom (bindable);
Assert.True (behavior.attached);
Assert.True (behavior.detached);
Assert.Null (behavior.AssociatedObject);
}
[Test]
public void AttachToTypeCompatibleWithTargetType ()
{
var behavior = new MockBehavior<MockBindable> ();
var bindable = new View ();
Assert.Throws<InvalidOperationException> (() => ((IAttachedObject)behavior).AttachTo (bindable));
}
[Test]
public void BehaviorsInCollectionAreAttachedWhenCollectionIsAttached ()
{
var behavior = new MockBehavior<MockBindable> ();
var collection = new AttachedCollection<Behavior> ();
var bindable = new MockBindable ();
collection.Add (behavior);
Assert.Null (behavior.AssociatedObject);
((IAttachedObject)collection).AttachTo (bindable);
Assert.AreSame (bindable, behavior.AssociatedObject);
((IAttachedObject)collection).DetachFrom (bindable);
Assert.Null (behavior.AssociatedObject);
}
[Test]
public void BehaviorsAddedToAttachedCollectionAreAttached ()
{
var behavior = new MockBehavior<MockBindable> ();
var collection = new AttachedCollection<Behavior> ();
var bindable = new MockBindable ();
((IAttachedObject)collection).AttachTo (bindable);
Assert.Null (behavior.AssociatedObject);
collection.Add (behavior);
Assert.AreSame (bindable, behavior.AssociatedObject);
collection.Remove (behavior);
Assert.Null (behavior.AssociatedObject);
}
[Test]
public void TestBehaviorsAttachedDP ()
{
var behavior = new MockBehavior<MockBindable> ();
var bindable = new MockBindable ();
var collection = bindable.Behaviors;
Assert.Null (behavior.AssociatedObject);
collection.Add (behavior);
Assert.AreSame (bindable, behavior.AssociatedObject);
collection.Remove (behavior);
Assert.Null (behavior.AssociatedObject);
}
[Test]
//https://bugzilla.xamarin.com/show_bug.cgi?id=44074
public void TestBehaviorsAreDetachedBeforeGarbageCollection()
{
WeakReference weakBindable = null;
var attachCount = MockBehavior<VisualElement>.AttachCount;
int i = 0;
Action create = null;
create = () =>
{
if (i++ < 1024)
{
create();
return;
}
var bindable = new MockBindable
{
Behaviors = {
new MockBehavior<VisualElement> ()
}
};
weakBindable = new WeakReference(bindable);
};
create();
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
Assert.False(weakBindable.IsAlive);
Assert.AreEqual(attachCount, MockBehavior<VisualElement>.AttachCount);
}
}
}
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