Where to look in the Xbox app for how long my Xbox Lide Gold is still available? The same question with the Xbox itself.
So you can see that on the Xbox homepage.
If you have a test subscription, you will not see it.
With the app, this is not possible as far as I know.
On the console, however. To do this you go to Settings and there equal the first point at the top account. Now select the field Subscriptions on the right side and get all subscriptions completed with Microsoft.
Alternatively you can also see that as already answered on the Microsoft side.