Tests that popstate events fire when navigating between pages (and history entries created via pushState) that are in the page cache.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

load fired
pushState with new state object for page 1
going to page 2
load fired
going back to page 1 with new state object
popstate fired with state newState
going back to page 1 in initial state
popstate fired with state null
PASS successfullyParsed is true

TEST COMPLETE