public void Category_Post_Can_Be_Removed()
{
var category = new Category();
var post = new Post();
category.AddPost(post);
Assert.AreEqual(1, category.Posts.Count());
Assert.AreEqual(1, post.Categories.Count());
category.RemovePost(post);
Assert.AreEqual(0, category.Posts.Count());
Assert.AreEqual(0, post.Categories.Count());
}
