public async Task AddUserAsync_NoRestrictions_Success()
        {
            // Arrange
            moqService.Setup(x => x.AddUserAsync(It.IsAny <User>())).ReturnsAsync(expectedUser);

            // Act
            var response = await controller.AddUserAsync(user) as ObjectResult;

            var actualUser = response.Value;

            // Assert
            moqService.VerifyAll();
            Assert.IsInstanceOfType(response, typeof(OkObjectResult));
            Assert.AreEqual(expectedUser, actualUser);
        }