Unsubscribe to a User's Posts

[askingalot]

As a reader I would like to unsubscribe from an author's Posts so that I won't see the Posts of author's I am no longer interested in reading.

Given a user is viewing the Post details of an author they are subscribed to
When they select the option to unsubscribe to the author
Then the Subscription end datetime should be updated with the current datetime
And the system should behave as it did before the user had created the Subscription