unit tests and cleanup

lib/Settings/Pages.php

@@ -8,14 +8,14 @@ class Pages {
       'post_type' => 'mailpoet_page'
     ));
 
-    $pages = array_merge($mailpoet_pages, get_pages());
-
-    foreach($pages as $key => $page) {
-      $page = (array)$page;
-      $page['preview_url'] = get_permalink($page['ID']);
-      $page['edit_url'] = get_edit_post_link($page['ID']);
-
-      $pages[$key] = $page;
+    $pages = array();
+    foreach(array_merge($mailpoet_pages, get_pages()) as $page) {
+      $pages[] = array(
+        'id' => $page->ID,
+        'title' => $page->post_title,
+        'preview_url' => get_permalink($page->ID),
+        'edit_url' => get_edit_post_link($page->ID)
+      );
     }
 
     return $pages;