Re: [nsubstitute] Raise Event not working

[Anthony Egerton]

The PostAuthenticateRequest event has to be virtual for NSubstitute to substitute for it.

Cheers,

Anthony

On Fri, Apr 26, 2013 at 5:49 PM, <ted...@gmail.com> wrote:

I am trying to write a unit test to verify the subscription to PostAuthenticateRequest event in the HttpApplication class using NSubstitute.  Here is what I have:ion

 

var flag = false;

var context = Substitute.For<System.Web.HttpApplication>();

context.PostAuthenticateRequest += (sender, args) => flag = true;

context.PostAuthenticateRequest += Raise.Event();

Assert.IsTrue(flag);

 

The test failed.  The Raise.Event() didn't trigger the delegate.  I tried Raise.EventWith(this, new EventArgs()) and Raise.EventWith(new object(), new EventArgs()) to no avail.

 

What did I do wrong?

 

 

 

 

 

 

 

 

 

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[ted...@gmail.com]

Thanks for the quick reply.  So how can I use NSubstitute to mock the subscription to this event?

[David Tchepak]

Hi tedmkuo,

Thanks for the quick reply.  So how can I use NSubstitute to mock the subscription to this event? 

Short answer is you can't. :-\

There are a few different ways to handle testing when there are mock-unfriendly classes involved. Can you post a specific example you want to test and we'll see what we can come up with?

Regards,

David

[Jordan]

I'm trying to do the same thing for the Activated EventHandler in the Caliburn.Micro framework related to the Screen class (http://caliburnmicro.codeplex.com/SourceControl/latest#src/Caliburn.Micro/Screen.cs). Since I am referencing the source code directly, I tried making the event virtual, but this made no difference. I've tried:

            var activatedWasCalled = false;

            this._vm.Activated += (sender, args) => activatedWasCalled = true;

            this._vm.Activated += Raise.EventWith( new ActivationEventArgs() );

            this._vm.Activated += Raise.EventWith( new object(), new ActivationEventArgs() );

            Assert.IsTrue( activatedWasCalled );

but activatedWasCalled continues to be false.

Any ideas?

[David Tchepak]

I've raised a bug for this: https://github.com/nsubstitute/NSubstitute/issues/121

For the Screen example there are a few workarounds. The first is to substitute for IScreen instead of Screen. This works:

[Test]

public void Screen()

{

    var vm = Substitute.For<IScreen>();

    var activatedWasCalled = false;

    vm.Activated += (sender, args) => activatedWasCalled = true;

    vm.Activated += Raise.EventWith(new ActivationEventArgs());

    vm.Activated += Raise.EventWith(new object(), new ActivationEventArgs());

    Assert.IsTrue(activatedWasCalled); 

}

Second option which is possible thanks to Caliburn's neat design is to use a real Screen:

[Test]

public void ScreenDirect()

{

    var vm = new Screen();

    var activatedWasCalled = false;

    vm.Activated += (sender, args) => activatedWasCalled = true;

    ((IActivate) vm).Activate();

    Assert.IsTrue(activatedWasCalled); 

}

(I don't think using the real instance will bleed over into other tests, but you'd need to check and confirm)

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