public void FindBeetwenDatePublishOkResultTest() { var startDate = new DateTime(2018, 1, 1); var endDate = new DateTime(2019, 1, 1); var response = _controller.FindBeetwenDatePublish(startDate, endDate).Result as OkObjectResult; Assert.IsNotNull(response); Assert.AreEqual(200, response.StatusCode); Assert.IsInstanceOfType(response.Value, typeof(IQueryable <BookDto>)); }