public void SomeTest()
{
// Arrange
var context = new ActionExecutingContext();
var fakeHttpContext = new Mock<HttpContextBase>();
var fakeRequest = new Mock<HttpRequestBase>();
var user = new Mock<Brony>();
context.HttpContext = fakeHttpContext.Object;
fakeHttpContext.Get(x=>x.Request, fakeRequest.Object);
fakeRequest.Get(x => x.User, fakeUser.Object);
user.Get(x=> x.FavouritePony, "Rainbow Dash");
var loggerMock = new Mock<FavouritePonyLogger>();
var attribute = new LogMyFavouritePony(logger.Object);
// Act
attribute.OnActionExecuting(context.Object);
// Assert
loggerMock.WasCalled(x=>x.LogFavouritePony(y=> Is.EqualTo(y, "Rainbow Dash")));
}