Club Drupal

<?php

/**

 * @file

 * Tests for menu.module.

 */

class MenuTestCase extends DrupalWebTestCase {

  protected $big_user;

  protected $std_user;

  protected $menu;

  protected $items;

  public static function getInfo() {

    return array(

      'name' => 'Menu link creation/deletion',

      'description' => 'Add a custom menu, add menu links to the custom menu and Navigation menu, check their data, and delete them using the menu module UI.',

      'group' => 'Menu'

    );

  }

  function setUp() {

    parent::setUp('menu');

    // Create users.

    $this->big_user = $this->drupalCreateUser(array('access administration pages', 'administer blocks', 'administer menu', 'create article content'));

    $this->std_user = $this->drupalCreateUser(array());

  }

  /**

   * Login users, add menus and menu links, and test menu functionality through the admin and user interfaces.

   */

  function testMenu() {

    // Login the user.

    $this->drupalLogin($this->big_user);

    $this->items = array();

    // Do standard menu tests.

    $this->doStandardMenuTests();

    // Do custom menu tests.

    $this->doCustomMenuTests();

    // Do standard user tests.

    // Login the user.

    $this->drupalLogin($this->std_user);

    $this->verifyAccess(403);

    foreach ($this->items as $item) {

      $node = node_load(substr($item['link_path'], 5)); // Paths were set as 'node/$nid'.

      $this->verifyMenuLink($item, $node);

    }

    // Login the user.

    $this->drupalLogin($this->big_user);

    // Delete menu links.

    foreach ($this->items as $item) {

      $this->deleteMenuLink($item);

    }

    // Delete custom menu.

    $this->deleteCustomMenu($this->menu);

    // Modify and reset a standard menu link.

    $item = $this->getStandardMenuLink();

    $old_title = $item['link_title'];

    $this->modifyMenuLink($item);

    $item = menu_link_load($item['mlid']);

    // Verify that a change to the description is saved.

    $description = $this->randomName(16);

    $item['options']['attributes']['title']  = $description;

    menu_link_save($item);

    $saved_item = menu_link_load($item['mlid']);

    $this->assertEqual($description, $saved_item['options']['attributes']['title'], 'Saving an existing link updates the description (title attribute)');

    $this->resetMenuLink($item, $old_title);

  }

  /**

   * Test standard menu functionality using navigation menu.

   *

   */

  function doStandardMenuTests() {

    $this->doMenuTests();

    $this->addInvalidMenuLink();

  }

  /**

   * Test custom menu functionality using navigation menu.

   *

   */

  function doCustomMenuTests() {

    $this->menu = $this->addCustomMenu();

    $this->doMenuTests($this->menu['menu_name']);

    $this->addInvalidMenuLink($this->menu['menu_name']);

    $this->addCustomMenuCRUD();

  }

  /**

   * Add custom menu using CRUD functions.

   */

  function addCustomMenuCRUD() {

    // Add a new custom menu.

    $menu_name = substr(hash('sha256', $this->randomName(16)), 0, MENU_MAX_MENU_NAME_LENGTH_UI);

    $title = $this->randomName(16);

    $menu = array(

      'menu_name' => $menu_name,

      'title' => $title,

      'description' => 'Description text',

    );

    menu_save($menu);

    // Assert the new menu.

    $this->drupalGet('admin/structure/menu/manage/' . $menu_name . '/edit');

    $this->assertRaw($title, 'Custom menu was added.');

    // Edit the menu.

    $new_title = $this->randomName(16);

    $menu['title'] = $new_title;

    menu_save($menu);

    $this->drupalGet('admin/structure/menu/manage/' . $menu_name . '/edit');

    $this->assertRaw($new_title, 'Custom menu was edited.');

  }

  /**

   * Add custom menu.

   */

  function addCustomMenu() {

    // Add custom menu.

    // Try adding a menu using a menu_name that is too long.

    $this->drupalGet('admin/structure/menu/add');

    $menu_name = substr(hash('sha256', $this->randomName(16)), 0, MENU_MAX_MENU_NAME_LENGTH_UI + 1);

    $title = $this->randomName(16);

    $edit = array(

      'menu_name' => $menu_name,

      'description' => '',

      'title' =>  $title,

    );

    $this->drupalPost('admin/structure/menu/add', $edit, t('Save'));

    // Verify that using a menu_name that is too long results in a validation message.

    $this->assertRaw(t('!name cannot be longer than %max characters but is currently %length characters long.', array(

      '!name' => t('Menu name'),

      '%max' => MENU_MAX_MENU_NAME_LENGTH_UI,

      '%length' => drupal_strlen($menu_name),

    )));

    // Change the menu_name so it no longer exceeds the maximum length.

    $menu_name = substr(hash('sha256', $this->randomName(16)), 0, MENU_MAX_MENU_NAME_LENGTH_UI);

    $edit['menu_name'] = $menu_name;

    $this->drupalPost('admin/structure/menu/add', $edit, t('Save'));

    // Verify that no validation error is given for menu_name length.

    $this->assertNoRaw(t('!name cannot be longer than %max characters but is currently %length characters long.', array(

      '!name' => t('Menu name'),

      '%max' => MENU_MAX_MENU_NAME_LENGTH_UI,

      '%length' => drupal_strlen($menu_name),

    )));

    // Unlike most other modules, there is no confirmation message displayed.

    $this->drupalGet('admin/structure/menu');

    $this->assertText($title, 'Menu created');

    // Enable the custom menu block.

    $menu_name = 'menu-' . $menu_name; // Drupal prepends the name with 'menu-'.

    $edit = array();

    $edit['blocks[menu_' . $menu_name . '][region]'] = 'sidebar_first';

    $this->drupalPost('admin/structure/block', $edit, t('Save blocks'));

    $this->assertResponse(200);

    $this->assertText(t('The block settings have been updated.'), 'Custom menu block was enabled');

    return menu_load($menu_name);

  }

  /**

   * Delete custom menu.

   *

   * @param string $menu_name Custom menu name.

   */

  function deleteCustomMenu($menu) {

    $menu_name = $this->menu['menu_name'];

    $title = $this->menu['title'];

    // Delete custom menu.

    $this->drupalPost("admin/structure/menu/manage/$menu_name/delete", array(), t('Delete'));

    $this->assertResponse(200);

    $this->assertRaw(t('The custom menu %title has been deleted.', array('%title' => $title)), 'Custom menu was deleted');

    $this->assertFalse(menu_load($menu_name), 'Custom menu was deleted');

    // Test if all menu links associated to the menu were removed from database.

    $result = db_query("SELECT menu_name FROM {menu_links} WHERE menu_name = :menu_name", array(':menu_name' => $menu_name))->fetchField();

    $this->assertFalse($result, 'All menu links associated to the custom menu were deleted.');

  }

  /**

   * Test menu functionality using navigation menu.

   *

   */

  function doMenuTests($menu_name = 'navigation') {

    // Add nodes to use as links for menu links.

    $node1 = $this->drupalCreateNode(array('type' => 'article'));

    $node2 = $this->drupalCreateNode(array('type' => 'article'));

    $node3 = $this->drupalCreateNode(array('type' => 'article'));

    $node4 = $this->drupalCreateNode(array('type' => 'article'));

    $node5 = $this->drupalCreateNode(array('type' => 'article'));

    // Add menu links.

    $item1 = $this->addMenuLink(0, 'node/' . $node1->nid, $menu_name);

    $item2 = $this->addMenuLink($item1['mlid'], 'node/' . $node2->nid, $menu_name, FALSE);

    $item3 = $this->addMenuLink($item2['mlid'], 'node/' . $node3->nid, $menu_name);

    $this->assertMenuLink($item1['mlid'], array('depth' => 1, 'has_children' => 1, 'p1' => $item1['mlid'], 'p2' => 0));

    $this->assertMenuLink($item2['mlid'], array('depth' => 2, 'has_children' => 1, 'p1' => $item1['mlid'], 'p2' => $item2['mlid'], 'p3' => 0));

    $this->assertMenuLink($item3['mlid'], array('depth' => 3, 'has_children' => 0, 'p1' => $item1['mlid'], 'p2' => $item2['mlid'], 'p3' => $item3['mlid'], 'p4' => 0));

    // Verify menu links.

    $this->verifyMenuLink($item1, $node1);

    $this->verifyMenuLink($item2, $node2, $item1, $node1);

    $this->verifyMenuLink($item3, $node3, $item2, $node2);

    // Add more menu links.

    $item4 = $this->addMenuLink(0, 'node/' . $node4->nid, $menu_name);

    $item5 = $this->addMenuLink($item4['mlid'], 'node/' . $node5->nid, $menu_name);

    $this->assertMenuLink($item4['mlid'], array('depth' => 1, 'has_children' => 1, 'p1' => $item4['mlid'], 'p2' => 0));

    $this->assertMenuLink($item5['mlid'], array('depth' => 2, 'has_children' => 0, 'p1' => $item4['mlid'], 'p2' => $item5['mlid'], 'p3' => 0));

    // Modify menu links.

    $this->modifyMenuLink($item1);

    $this->modifyMenuLink($item2);

    // Toggle menu links.

    $this->toggleMenuLink($item1);

    $this->toggleMenuLink($item2);

    // Move link and verify that descendants are updated.

    $this->moveMenuLink($item2, $item5['mlid'], $menu_name);

    $this->assertMenuLink($item1['mlid'], array('depth' => 1, 'has_children' => 0, 'p1' => $item1['mlid'], 'p2' => 0));

    $this->assertMenuLink($item4['mlid'], array('depth' => 1, 'has_children' => 1, 'p1' => $item4['mlid'], 'p2' => 0));

    $this->assertMenuLink($item5['mlid'], array('depth' => 2, 'has_children' => 1, 'p1' => $item4['mlid'], 'p2' => $item5['mlid'], 'p3' => 0));

    $this->assertMenuLink($item2['mlid'], array('depth' => 3, 'has_children' => 1, 'p1' => $item4['mlid'], 'p2' => $item5['mlid'], 'p3' => $item2['mlid'], 'p4' => 0));

    $this->assertMenuLink($item3['mlid'], array('depth' => 4, 'has_children' => 0, 'p1' => $item4['mlid'], 'p2' => $item5['mlid'], 'p3' => $item2['mlid'], 'p4' => $item3['mlid'], 'p5' => 0));

    // Enable a link via the overview form.

    $this->disableMenuLink($item1);

    $edit = array();

    // Note in the UI the 'mlid:x[hidden]' form element maps to enabled, or

    // NOT hidden.

    $edit['mlid:' . $item1['mlid'] . '[hidden]'] = TRUE;

    $this->drupalPost('admin/structure/menu/manage/' . $item1['menu_name'], $edit, t('Save configuration'));

    // Verify in the database.

    $this->assertMenuLink($item1['mlid'], array('hidden' => 0));

    // Save menu links for later tests.

    $this->items[] = $item1;

    $this->items[] = $item2;

  }

  /**

   * Add and remove a menu link with a query string and fragment.

   */

  function testMenuQueryAndFragment() {

    $this->drupalLogin($this->big_user);

    // Make a path with query and fragment on.

    $path = 'node?arg1=value1&arg2=value2';

    $item = $this->addMenuLink(0, $path);

    $this->drupalGet('admin/structure/menu/item/' . $item['mlid'] . '/edit');

    $this->assertFieldByName('link_path', $path, 'Path is found with both query and fragment.');

    // Now change the path to something without query and fragment.

    $path = 'node';

    $this->drupalPost('admin/structure/menu/item/' . $item['mlid'] . '/edit', array('link_path' => $path), t('Save'));

    $this->drupalGet('admin/structure/menu/item/' . $item['mlid'] . '/edit');

    $this->assertFieldByName('link_path', $path, 'Path no longer has query or fragment.');

  }

  /**

   * Add a menu link using the menu module UI.

   *

   * @param integer $plid Parent menu link id.

   * @param string $link Link path.

   * @param string $menu_name Menu name.

   * @return array Menu link created.

   */

  function addMenuLink($plid = 0, $link = '<front>', $menu_name = 'navigation', $expanded = TRUE) {

    // View add menu link page.

    $this->drupalGet("admin/structure/menu/manage/$menu_name/add");

    $this->assertResponse(200);

    $title = '!link_' . $this->randomName(16);

    $edit = array(

      'link_path' => $link,

      'link_title' => $title,

      'description' => '',

      'enabled' => TRUE, // Use this to disable the menu and test.

      'expanded' => $expanded, // Setting this to true should test whether it works when we do the std_user tests.

      'parent' =>  $menu_name . ':' . $plid,

      'weight' => '0',

    );

    // Add menu link.

    $this->drupalPost(NULL, $edit, t('Save'));

    $this->assertResponse(200);

    // Unlike most other modules, there is no confirmation message displayed.

    $this->assertText($title, 'Menu link was added');

    $item = db_query('SELECT * FROM {menu_links} WHERE link_title = :title', array(':title' => $title))->fetchAssoc();

    $this->assertTrue(t('Menu link was found in database.'));

    $this->assertMenuLink($item['mlid'], array('menu_name' => $menu_name, 'link_path' => $link, 'has_children' => 0, 'plid' => $plid));

    return $item;

  }

  /**

   * Attempt to add menu link with invalid path or no access permission.

   *

   * @param string $menu_name Menu name.

   */

  function addInvalidMenuLink($menu_name = 'navigation') {

    foreach (array('-&-', 'admin/people/permissions', '#') as $link_path) {

      $edit = array(

        'link_path' => $link_path,

        'link_title' => 'title',

      );

      $this->drupalPost("admin/structure/menu/manage/$menu_name/add", $edit, t('Save'));

      $this->assertRaw(t("The path '@path' is either invalid or you do not have access to it.", array('@path' => $link_path)), 'Menu link was not created');

    }

  }

  /**

   * Verify a menu link using the menu module UI.

   *

   * @param array $item Menu link.

   * @param object $item_node Menu link content node.

   * @param array $parent Parent menu link.

   * @param object $parent_node Parent menu link content node.

   */

  function verifyMenuLink($item, $item_node, $parent = NULL, $parent_node = NULL) {

    // View home page.

    $this->drupalGet('');

    $this->assertResponse(200);

    // Verify parent menu link.

    if (isset($parent)) {

      // Verify menu link.

      $title = $parent['link_title'];

      $this->assertLink($title, 0, 'Parent menu link was displayed');

      // Verify menu link link.

      $this->clickLink($title);

      $title = $parent_node->title;

      $this->assertTitle(t("@title | Drupal", array('@title' => $title)), 'Parent menu link link target was correct');

    }

    // Verify menu link.

    $title = $item['link_title'];

    $this->assertLink($title, 0, 'Menu link was displayed');

    // Verify menu link link.

    $this->clickLink($title);

    $title = $item_node->title;

    $this->assertTitle(t("@title | Drupal", array('@title' => $title)), 'Menu link link target was correct');

  }

  /**

   * Change the parent of a menu link using the menu module UI.

   */

  function moveMenuLink($item, $plid, $menu_name) {

    $mlid = $item['mlid'];

    $edit = array(

      'parent' => $menu_name . ':' . $plid,

    );

    $this->drupalPost("admin/structure/menu/item/$mlid/edit", $edit, t('Save'));

    $this->assertResponse(200);

  }

  /**

   * Modify a menu link using the menu module UI.

   *

   * @param array $item Menu link passed by reference.

   */

  function modifyMenuLink(&$item) {

    $item['link_title'] = $this->randomName(16);

    $mlid = $item['mlid'];

    $title = $item['link_title'];

    // Edit menu link.

    $edit = array();

    $edit['link_title'] = $title;

    $this->drupalPost("admin/structure/menu/item/$mlid/edit", $edit, t('Save'));

    $this->assertResponse(200);

    // Unlike most other modules, there is no confirmation message displayed.

    // Verify menu link.

    $this->drupalGet('admin/structure/menu/manage/' . $item['menu_name']);

    $this->assertText($title, 'Menu link was edited');

  }

  /**

   * Reset a standard menu link using the menu module UI.

   *

   * @param array $item Menu link.

   * @param string $old_title Original title for menu link.

   */

  function resetMenuLink($item, $old_title) {

    $mlid = $item['mlid'];

    $title = $item['link_title'];

    // Reset menu link.

    $this->drupalPost("admin/structure/menu/item/$mlid/reset", array(), t('Reset'));

    $this->assertResponse(200);

    $this->assertRaw(t('The menu link was reset to its default settings.'), 'Menu link was reset');

    // Verify menu link.

    $this->drupalGet('');

    $this->assertNoText($title, 'Menu link was reset');

    $this->assertText($old_title, 'Menu link was reset');

  }

  /**

   * Delete a menu link using the menu module UI.

   *

   * @param array $item Menu link.

   */

  function deleteMenuLink($item) {

    $mlid = $item['mlid'];

    $title = $item['link_title'];

    // Delete menu link.

    $this->drupalPost("admin/structure/menu/item/$mlid/delete", array(), t('Confirm'));

    $this->assertResponse(200);

    $this->assertRaw(t('The menu link %title has been deleted.', array('%title' => $title)), 'Menu link was deleted');

    // Verify deletion.

    $this->drupalGet('');

    $this->assertNoText($title, 'Menu link was deleted');

  }

  /**

   * Alternately disable and enable a menu link.

   *

   * @param $item

   *   Menu link.

   */

  function toggleMenuLink($item) {

    $this->disableMenuLink($item);

    // Verify menu link is absent.

    $this->drupalGet('');

    $this->assertNoText($item['link_title'], 'Menu link was not displayed');

    $this->enableMenuLink($item);

    // Verify menu link is displayed.

    $this->drupalGet('');

    $this->assertText($item['link_title'], 'Menu link was displayed');

  }

  /**

   * Disable a menu link.

   *

   * @param $item

   *   Menu link.

   */

  function disableMenuLink($item) {

    $mlid = $item['mlid'];

    $edit['enabled'] = FALSE;

    $this->drupalPost("admin/structure/menu/item/$mlid/edit", $edit, t('Save'));

    // Unlike most other modules, there is no confirmation message displayed.

    // Verify in the database.

    $this->assertMenuLink($mlid, array('hidden' => 1));

  }

  /**

   * Enable a menu link.

   *

   * @param $item

   *   Menu link.

   */

  function enableMenuLink($item) {

    $mlid = $item['mlid'];

    $edit['enabled'] = TRUE;

    $this->drupalPost("admin/structure/menu/item/$mlid/edit", $edit, t('Save'));

    // Verify in the database.

    $this->assertMenuLink($mlid, array('hidden' => 0));

  }

  /**

   * Fetch the menu item from the database and compare it to the specified

   * array.

   *

   * @param $mlid

   *   Menu item id.

   * @param $item

   *   Array containing properties to verify.

   */

  function assertMenuLink($mlid, array $expected_item) {

    // Retrieve menu link.

    $item = db_query('SELECT * FROM {menu_links} WHERE mlid = :mlid', array(':mlid' => $mlid))->fetchAssoc();

    $options = unserialize($item['options']);

    if (!empty($options['query'])) {

      $item['link_path'] .= '?' . drupal_http_build_query($options['query']);

    }

    if (!empty($options['fragment'])) {

      $item['link_path'] .= '#' . $options['fragment'];

    }

    foreach ($expected_item as $key => $value) {

      $this->assertEqual($item[$key], $value, format_string('Parameter %key had expected value.', array('%key' => $key)));

    }

  }

  /**

   * Get standard menu link.

   */

  private function getStandardMenuLink() {

    // Retrieve menu link id of the Log out menu link, which will always be on the front page.

    $mlid = db_query("SELECT mlid FROM {menu_links} WHERE module = 'system' AND router_path = 'user/logout'")->fetchField();

    $this->assertTrue($mlid > 0, 'Standard menu link id was found');

    // Load menu link.

    // Use api function so that link is translated for rendering.

    $item = menu_link_load($mlid);

    $this->assertTrue((bool) $item, 'Standard menu link was loaded');

    return $item;

  }

  /**

   * Verify the logged in user has the desired access to the various menu nodes.

   *

   * @param integer $response HTTP response code.

   */

  private function verifyAccess($response = 200) {

    // View menu help node.

    $this->drupalGet('admin/help/menu');

    $this->assertResponse($response);

    if ($response == 200) {

      $this->assertText(t('Menu'), 'Menu help was displayed');

    }

    // View menu build overview node.

    $this->drupalGet('admin/structure/menu');

    $this->assertResponse($response);

    if ($response == 200) {

      $this->assertText(t('Menus'), 'Menu build overview node was displayed');

    }

    // View navigation menu customization node.

    $this->drupalGet('admin/structure/menu/manage/navigation');

        $this->assertResponse($response);

    if ($response == 200) {

      $this->assertText(t('Navigation'), 'Navigation menu node was displayed');

    }

    // View menu edit node.

    $item = $this->getStandardMenuLink();

    $this->drupalGet('admin/structure/menu/item/' . $item['mlid'] . '/edit');

    $this->assertResponse($response);

    if ($response == 200) {

      $this->assertText(t('Edit menu item'), 'Menu edit node was displayed');

    }

    // View menu settings node.

    $this->drupalGet('admin/structure/menu/settings');

    $this->assertResponse($response);

    if ($response == 200) {

      $this->assertText(t('Menus'), 'Menu settings node was displayed');

    }

    // View add menu node.

    $this->drupalGet('admin/structure/menu/add');

    $this->assertResponse($response);

    if ($response == 200) {

      $this->assertText(t('Menus'), 'Add menu node was displayed');

    }

  }

}

/**

 * Test menu settings for nodes.

 */

class MenuNodeTestCase extends DrupalWebTestCase {

  public static function getInfo() {

    return array(

      'name' => 'Menu settings for nodes',

      'description' => 'Add, edit, and delete a node with menu link.',

      'group' => 'Menu',

    );

  }

  function setUp() {

    parent::setUp('menu');

    $this->admin_user = $this->drupalCreateUser(array(

      'access administration pages',

      'administer content types',

      'administer menu',

      'create page content',

      'edit any page content',

      'delete any page content',

    ));

    $this->drupalLogin($this->admin_user);

  }

  /**

   * Test creating, editing, deleting menu links via node form widget.

   */

  function testMenuNodeFormWidget() {

    // Enable Navigation menu as available menu.

    $edit = array(

      'menu_options[navigation]' => 1,

    );

    $this->drupalPost('admin/structure/types/manage/page', $edit, t('Save content type'));

    // Change default parent item to Navigation menu, so we can assert more

    // easily.

    $edit = array(

      'menu_parent' => 'navigation:0',

    );

    $this->drupalPost('admin/structure/types/manage/page', $edit, t('Save content type'));

    // Create a node.

    $node_title = $this->randomName();

    $language = LANGUAGE_NONE;

    $edit = array(

      "title" => $node_title,

      "body[$language][0][value]" => $this->randomString(),

    );

    $this->drupalPost('node/add/page', $edit, t('Save'));

    $node = $this->drupalGetNodeByTitle($node_title);

    // Assert that there is no link for the node.

    $this->drupalGet('');

    $this->assertNoLink($node_title);

    // Edit the node, enable the menu link setting, but skip the link title.

    $edit = array(

      'menu[enabled]' => 1,

    );

    $this->drupalPost('node/' . $node->nid . '/edit', $edit, t('Save'));

    // Assert that there is no link for the node.

    $this->drupalGet('');

    $this->assertNoLink($node_title);

    // Edit the node and create a menu link.

    $edit = array(

      'menu[enabled]' => 1,

      'menu[link_title]' => $node_title,

      'menu[weight]' => 17,

    );

    $this->drupalPost('node/' . $node->nid . '/edit', $edit, t('Save'));

    // Assert that the link exists.

    $this->drupalGet('');

    $this->assertLink($node_title);

    $this->drupalGet('node/' . $node->nid . '/edit');

    $this->assertOptionSelected('edit-menu-weight', 17, 'Menu weight correct in edit form');

    // Edit the node and remove the menu link.

    $edit = array(

      'menu[enabled]' => FALSE,

    );

    $this->drupalPost('node/' . $node->nid . '/edit', $edit, t('Save'));

    // Assert that there is no link for the node.

    $this->drupalGet('');

    $this->assertNoLink($node_title);

    // Add a menu link to the Management menu.

    $item = array(

      'link_path' => 'node/' . $node->nid,

      'link_title' => $this->randomName(16),

      'menu_name' => 'management',

    );

    menu_link_save($item);

    // Assert that disabled Management menu is not shown on the node/$nid/edit page.

    $this->drupalGet('node/' . $node->nid . '/edit');

    $this->assertText('Provide a menu link', 'Link in not allowed menu not shown in node edit form');

    // Assert that the link is still in the management menu after save.

    $this->drupalPost('node/' . $node->nid . '/edit', $edit, t('Save'));

    $link = menu_link_load($item['mlid']);

    $this->assertTrue($link, 'Link in not allowed menu still exists after saving node');

    // Move the menu link back to the Navigation menu.

    $item['menu_name'] = 'navigation';

    menu_link_save($item);

    // Create a second node.

    $child_node = $this->drupalCreateNode(array('type' => 'article'));

    // Assign a menu link to the second node, being a child of the first one.

    $child_item = array(

      'link_path' => 'node/'. $child_node->nid,

      'link_title' => $this->randomName(16),

      'plid' => $item['mlid'],

    );

    menu_link_save($child_item);

    // Edit the first node.

    $this->drupalGet('node/'. $node->nid .'/edit');

    // Assert that it is not possible to set the parent of the first node to itself or the second node.

    $this->assertNoOption('edit-menu-parent', 'navigation:'. $item['mlid']);

    $this->assertNoOption('edit-menu-parent', 'navigation:'. $child_item['mlid']);

    // Assert that unallowed Management menu is not available in options.

    $this->assertNoOption('edit-menu-parent', 'management:0');

  }

  /**

   * Asserts that a select option in the current page does not exist.

   *

   * @param $id

   *   Id of select field to assert.

   * @param $option

   *   Option to assert.

   * @param $message

   *   Message to display.

   * @return

   *   TRUE on pass, FALSE on fail.

   *

   * @todo move to simpletest drupal_web_test_case.php.

   */

  protected function assertNoOption($id, $option, $message = '') {

    $selects = $this->xpath('//select[@id=:id]', array(':id' => $id));

    $options = $this->xpath('//select[@id=:id]//option[@value=:option]', array(':id' => $id, ':option' => $option));

    return $this->assertTrue(isset($selects[0]) && !isset($options[0]), $message ? $message : t('Option @option for field @id does not exist.', array('@option' => $option, '@id' => $id)), t('Browser'));

  }

}