function test_filter_c2c_admin_post_navigation_orderby()
{
add_filter('c2c_admin_post_navigation_orderby', array($this, 'c2c_admin_post_navigation_orderby'), 10, 2);
$posts = $this->create_posts();
// Change post dates so post ordering by date is 3, 0, 2, 4, 1
$new_post_dates = array('2015-06-13 12:30:00', '2015-03-13 12:30:00', '2015-05-13 12:30:00', '2015-07-13 12:30:00', '2015-04-13 12:30:00');
foreach ($new_post_dates as $i => $date) {
$post = get_post($posts[$i]);
$post->post_date = $date;
wp_update_post($post);
}
$next_post = c2c_AdminPostNavigation::next_post();
$this->assertEquals($posts[0], $next_post->ID);
$previous_post = c2c_AdminPostNavigation::previous_post();
$this->assertEquals($posts[4], $previous_post->ID);
}
