How do I raise an event when a method is called using Moq?

Question

I've got an interface like this:

public interface IMyInterface {     event EventHandler<bool> Triggered;     void Trigger(); } 

And I've got a mocked object in my unit test like this:

private Mock<IMyInterface> _mockedObject = new Mock<IMyInterface>(); 

I want to do something like this:

// pseudo-code _mockedObject.Setup(i => i.Trigger()).Raise(i => i.Triggered += null, this, true); 

However it doesn't look like Raise is available on the ISetup interface that gets returned. How do I do this?

Answer 1

Your pseudo-code was almost spot on. You needed to use Raises instead of Raise. Check the Moq Quickstart: Events for versions Moq 4.x and you will see where you made the mistake.

_mockedObject.Setup(i => i.Trigger()).Raises(i => i.Triggered += null, this, true); 

Here is the snippet form GitHub

// Raising an event on the mock mock.Raise(m => m.FooEvent += null, new FooEventArgs(fooValue));  // Raising an event on a descendant down the hierarchy mock.Raise(m => m.Child.First.FooEvent += null, new FooEventArgs(fooValue));  // Causing an event to raise automatically when Submit is invoked mock.Setup(foo => foo.Submit()).Raises(f => f.Sent += null, EventArgs.Empty); // The raised event would trigger behavior on the object under test, which  // you would make assertions about later (how its state changed as a consequence, typically)  // Raising a custom event which does not adhere to the EventHandler pattern public delegate void MyEventHandler(int i, bool b); public interface IFoo {   event MyEventHandler MyEvent;  }  var mock = new Mock<IFoo>(); ... // Raise passing the custom arguments expected by the event delegate mock.Raise(foo => foo.MyEvent += null, 25, true);