public async Task ExportJson_RedirectToIndex()
        {
            Mock <AnnualLeaveService> mock       = new Mock <AnnualLeaveService>();
            AnnualLeaveController     controller = GetNewAnnualLeaveControllerWithControllerContext(mock.Object, null);

            FilePathResult result = (await controller.ExportJson()) as FilePathResult;

            Assert.AreEqual("application/json", result.ContentType);
            Assert.AreEqual("AnnualLeaves.json", result.FileDownloadName);
            Assert.AreEqual("./DiplomMSSQLApp.WEB/Results/AnnualLeaves.json", result.FileName);
        }