Expect call for delegate function

public class class1
{
private class2 c2;

public class1()
{
c2 = new class2();
c2.EventReceived += new c2.NotifyEventReceived(this.OnEventReceived);
}

private void OnEventReceived(int a){}
}

public class class2
{
public delegate void NotifyEventReceived(int a);
public event NotifyEventReceived EventReceived;

public class2(){}

}

[Test]
public void test()
{
MockManager.Init();
Mock mockClass2 = MockManager.Mock(typeof(class2));

class1 c1 = new class1();

MockManager.Verify();

}

May i know how to expect call the delegate function - c2.EventReceived += new c2.NotifyEventReceived(this.OnEventReceived); Thankss.. Any idea for it?