public async Task AddNoteWithAttachments_ShouldReturnOk_OnSuccessfulServiceCall()
        {
            var model = new NoteWithAttachments
            {
                Attachments            = new List <StockportGovUK.NetStandard.Models.FileManagement.File>(),
                AttachmentsDescription = "description",
                CaseRef = 123456789123
            };

            var result = await _caseController.AddNoteWithAttachments(model);

            _mockCaseService.Verify(service => service.CreateNotesWithAttachment(It.IsAny <NoteWithAttachments>()), Times.Once);
            var okResult = Assert.IsType <OkResult>(result);

            Assert.Equal(200, okResult.StatusCode);
        }