public void DeletePost_GivenValidInputs_ReturnOk()
{
var postId = 5;
var user = "******"UserId\" : \"si\"}";
var expected = new OkResult();
var actual = (StatusCodeResult)_topicController.DeletePost(postId, user).Result;
_posts.RemoveAll(p => p.Id == postId);
Assert.AreEqual(expected.StatusCode, actual.StatusCode);
}