Queueing for a book

[esanmiguelc]

As a registered User #4
Given I want to take a book loaned #9
When I search for a book
And that book is not available
Then I should be able to get in the queue

Given I want to take a book loaned #9
And I am in the queue
And i am the first in queue
When someone returns a book
Then the loaned book should be assigned to me

Given I want to take a book loaned #9
And I am in the queue
And i'm not the first in queue
When someone returns a book
Then I should be notified of my place in the queue