public void WhenInstanceIsNull_ThenHandlerIsDetached()
{
WeakEventListenerFixture instance = null;
var sender = new EventSource();
var invoked = false;
var detached = false;
var weakHandler =
new WeakEventHandler <WeakEventListenerFixture, object, EventArgs>(
instance,
(i, s, e) =>
{
invoked = true;
},
handler =>
{
sender.Event -= handler.OnEvent;
detached = true;
});
sender.Event += weakHandler.OnEvent;
sender.FireEvent(new EventArgs());
Assert.IsFalse(invoked);
Assert.IsTrue(detached);
}
public void WhenDetached_ThenDoesNotInvokeCallbackOnEvent()
{
var instance = this;
var sender = new EventSource();
var invoked = false;
var weakHandler =
new WeakEventHandler <WeakEventListenerFixture, object, EventArgs>(
instance,
(i, s, e) =>
{
invoked = true;
},
handler => { sender.Event -= handler.OnEvent; });
sender.Event += weakHandler.OnEvent;
weakHandler.Detach();
sender.FireEvent(new EventArgs());
Assert.IsFalse(invoked);
}
public void WhenDetachedWithNullDetachAction_ThenInvokesCallbackOnEvent()
{
var instance = this;
var sender = new EventSource();
var invoked = false;
var weakHandler =
new WeakEventHandler <WeakEventListenerFixture, object, EventArgs>(
instance,
(i, s, e) =>
{
invoked = true;
},
null);
sender.Event += weakHandler.OnEvent;
weakHandler.Detach();
sender.FireEvent(new EventArgs());
Assert.IsTrue(invoked);
}
public void WhenDetached_ThenDoesNotInvokeCallbackOnEvent()
{
var instance = this;
var sender = new EventSource();
var invoked = false;
var weakHandler =
new WeakEventHandler<WeakEventListenerFixture, object, EventArgs>(
instance,
(i, s, e) =>
{
invoked = true;
},
handler => { sender.Event -= handler.OnEvent; });
sender.Event += weakHandler.OnEvent;
weakHandler.Detach();
sender.FireEvent(new EventArgs());
Assert.IsFalse(invoked);
}
public void WhenAttachedToAnEvent_ThenInvokesCallbackOnEvent()
{
var instance = this;
var sender = new EventSource();
var args = new EventArgs();
var invoked = false;
var weakHandler =
new WeakEventHandler <WeakEventListenerFixture, object, EventArgs>(
instance,
(i, s, e) =>
{
Assert.AreSame(this, i);
Assert.AreSame(sender, s);
Assert.AreSame(args, e);
invoked = true;
},
handler => { sender.Event -= handler.OnEvent; });
sender.Event += weakHandler.OnEvent;
sender.FireEvent(args);
Assert.IsTrue(invoked);
}
public void WhenAttachedToAnEvent_ThenInvokesCallbackOnEvent()
{
var instance = this;
var sender = new EventSource();
var args = new EventArgs();
var invoked = false;
var weakHandler =
new WeakEventHandler<WeakEventListenerFixture, object, EventArgs>(
instance,
(i, s, e) =>
{
Assert.AreSame(this, i);
Assert.AreSame(sender, s);
Assert.AreSame(args, e);
invoked = true;
},
handler => { sender.Event -= handler.OnEvent; });
sender.Event += weakHandler.OnEvent;
sender.FireEvent(args);
Assert.IsTrue(invoked);
}
public void WhenInstanceIsNull_ThenHandlerIsDetached()
{
WeakEventListenerFixture instance = null;
var sender = new EventSource();
var invoked = false;
var detached = false;
var weakHandler =
new WeakEventHandler<WeakEventListenerFixture, object, EventArgs>(
instance,
(i, s, e) =>
{
invoked = true;
},
handler =>
{
sender.Event -= handler.OnEvent;
detached = true;
});
sender.Event += weakHandler.OnEvent;
sender.FireEvent(new EventArgs());
Assert.IsFalse(invoked);
Assert.IsTrue(detached);
}
public void WhenDetachedWithNullDetachAction_ThenInvokesCallbackOnEvent()
{
var instance = this;
var sender = new EventSource();
var invoked = false;
var weakHandler =
new WeakEventHandler<WeakEventListenerFixture, object, EventArgs>(
instance,
(i, s, e) =>
{
invoked = true;
},
null);
sender.Event += weakHandler.OnEvent;
weakHandler.Detach();
sender.FireEvent(new EventArgs());
Assert.IsTrue(invoked);
}