public void ShouldSuccessWhenParameterIsUserAndUserIsAllowed()
{
_controller.ControllerContext.RequestContext.Principal =
new GenericPrincipal(new GenericIdentity("foo", "bar"), new[] { "user" });
_userResource.Setup(a => a.GetByUserName(It.IsAny<string>())).Returns(new User { Id = 1 });
_httpActionContext.ActionArguments.Add("dummy", new User { Id = 1 });
var attribute = new PreventCrossUserManipulationAttribute { UsersResource = _userResource.Object };
Assert.DoesNotThrow(() => attribute.OnActionExecuting(_httpActionContext));
}