When editing pages each version is recorded in the versions list.

Create a page to be requested.
!|Page creator.|
|Page name.|valid?|
|VersionsPage|true|

Now save the page a couple times.  This will produce a version history.
!|Response Requester.|
|uri|status?|
|VersionsPage?responder=saveData&pageContent=a+change&editTime=0&ticketId=0|303|
|VersionsPage?responder=saveData&pageContent=another+change&editTime=0&ticketId=0|303|

Now load up the version list.
!|Response Requester.|
|uri|status?|
|VersionsPage?versions|200|

The version list has the correct headings.
|Response Examiner.|
|type|pattern|matches?|
|contents|>Compare<|true|
|contents|>Name<|true|
|contents|>Author<|true|
|contents|>Age<|true|

The version list has 3 entries and each has a checkbox.
|Response Examiner.|
|type|pattern|matches?|matchCount?|
|contents|!-href="\?responder=viewVersion&amp;version=-!|true|4|
|contents|!-input type="checkbox" name="Version_-!|true|4|

Show the contents.
|Response Examiner.|
|contents?|
||