public void CallingPostAssetsReturnsCreatedResponse()
        {
            var sut         = new AssetsController();
            var assetToPost = new DocumentAsset
            {
                Identifier   = "54321",
                DocumentType = "Doc Type"
            };
            var result = sut.Post(assetToPost.SerialiseToJson());

            Assert.NotNull(result);
            Assert.IsInstanceOf <IActionResult>(result);
            Assert.IsInstanceOf <ObjectResult>(result);

            var actionResult = result as ObjectResult;

            Assert.AreEqual(201, actionResult.StatusCode);
            StringAssert.Contains("\"identifier\":\"54321\"", actionResult.Value.ToString());
        }