public async Task CreateNoteShouldSuccess()
        {
            string userId = "*****@*****.**";
            Note   note   = new Note {
                Id = 2, Title = "Test", Content = "Unit Testing using Nunit", CreationDate = DateTime.Now
            };
            await noteRepository.AddNoteForExistingUser(userId, note);

            var result = await noteRepository.GetNotesByUser(userId);

            Assert.AreEqual(2, result.Count);
            Assert.AreEqual("Test", result[1].Title);
            Assert.AreEqual(2, result[1].Id);
        }