How to write mock test for EventHandler

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C#2.0

C#3.0

C#

ASP.NET

MVC

C#3.5

, +

public sealed class AllExceptionHandler : IHttpModule
    {

        void IHttpModule.Init(HttpApplication context)
        {
            context.Error += new EventHandler(UncaughtException);
        }

        void IHttpModule.Dispose()
        {

        }

        private void UncaughtException(object sender, EventArgs e)
        {
            log.Error("Test Message");  
        }
    }

I Wrote :

[TestMethod, CategorizeByConvention]
        public void WhenValidParameter_ShouldSetHandleUnCaughtException()
        {
            //Arrange
            var target = new AllExceptionHandler() as IHttpModule;
            var context = new Mock<HttpApplication>(MockBehavior.Strict);

            context.Raise(e => e.Error += null, new EventArgs());

            //Assert

        }

I am getting exception :

An exception of type 'System.ArgumentException' occurred in Moq.dll but was not handled in user code

Additional information: Expression is not an event attach or detach, or the event is declared in a class but not marked virtual.