public async Task AddToCartAsync_Requires_Authentication()
{
var req = TestHelper.CreateHttpRequest("https://nzb.mtighe.dev/api/cart/add/123");
_authService.Setup(s => s.IsAuthenticated(req)).ReturnsAsync(false);
var result = await _function.AddToCartAsync(req, new MockCloudTable().Object, _cartTable.Object, _log.Object, "123");
Assert.IsType <UnauthorizedResult>(result);
}