public void CanDeleteCategory()
{
PostRepo repo = new PostRepo();
List <Category> Cats = repo.GetAllCategories();
Assert.AreEqual(3, Cats.Count);
repo.DeleteCategory(1);
List <Category> Cats2 = repo.GetAllCategories();
Assert.AreEqual(2, Cats2.Count);
Assert.AreEqual(2, Cats2[0].CategoryID);
}