public void Can_list_posts_with_certain_tag()
{
var postList = new List<Post>();
postService.Expect(x => x.GetPostsByTagPaged(blog, "myTag", 0, 10)).Return(postList);
var result = controller.ListByTag("myTag", 1) as ViewResult;
var data = result.ViewData.Model;
Assert.That(data, Is.Not.Null);
}