Make sure the cron UI reads from the state storage.
function testCronUI() {
$admin_user = $this
->drupalCreateUser(array(
'administer site configuration',
));
$this
->drupalLogin($admin_user);
$this
->drupalGet('admin/config/system/cron');
// Don't use REQUEST to calculate the exact time, because that will
// fail randomly. Look for the word 'years', because without a timestamp,
// the time will start at 1 January 1970.
$this
->assertNoText('years');
}