Delete a menu link using the menu module UI.
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');
}