Question

class A
{
    event EventHandler Event1;
}
var mock = new Mock<A>();

How do I verify Event1 was fired? (without using manual event handlers / triggered flags)

Answer 1

var mock = new Mock<IInterfaceWithEvent>();
mock.Raise(e => e.MyEvent += null, EventArgs.Empty);
mock.VerifyAll();

or if you want to make sure that act raises an event, your setup should look like:

mock.Setup(foo => foo.Submit()).Raises(f => f.Sent += null, EventArgs.Empty);
// ...
mock.VerifyAll();