Mocking a javascript callback in a c# host application

Question

I am creating a c# application that has an embedded webbrowser control. From javascript I am calling a c# method and passing a javascript callback. I am using the dynamic technique from this answer:

public void CallbackTest(object callback)
{
    dynamic callbackFunc = callback;
    callbackFunc("Hello!");
}

My problem is how would I go about unit testing this method? How do I mock (or fake) the callback parameter? For what it's worth, my mocking library of choice is Moq.

Justin Pihony · Accepted Answer · 2014-02-05 19:32:13Z

1

I would imagine that you could just pass in an Action<String> and this should work as a callback. I am not sure if you can get support for this kind of dynamic in Moq directly, though. But, using an Action is pretty straightforward anyway

var mockCallBack = new Action<String>(str => {return;});
CallbackTest(mockCallBack)

answered Feb 5, 2014 at 19:32

Justin Pihony

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1 Comment

arch-imp Over a year ago

That's it. Don't know why I had such trouble coming up with that on my own. :) Thanks.

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