<?php

function fp_menu() {
  $items['fp'] = array(
    'page callback' => 'fp_page',
    'access arguments' => array('access content'),
 );
 return $items;
}

// This page displays all out fields and nothing else.
// It does not run through theme('page') in order to isolate fields.
function fp_page() {
  $output = '';
  
  $sql = "SELECT * FROM {test_entity}";
  $all = db_query($sql);
  foreach ($all as $row) {
    $entity = field_test_entity_load($row->ftid);
    $entity->content = field_attach_view('test_entity', $entity);
    $output .= drupal_render($entity->content); 
  }
  print $output;
  exit();
}