materio-base-d7/modules/simpletest/tests/error_test.module

<?php

/**
 * Implements hook_menu().
 */
function error_test_menu() {
  $items['error-test/generate-warnings'] = array(
    'title' => 'Generate warnings',
    'page callback' => 'error_test_generate_warnings',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );
  $items['error-test/generate-warnings-with-report'] = array(
    'title' => 'Generate warnings with Simpletest reporting',
    'page callback' => 'error_test_generate_warnings',
    'page arguments' => array(TRUE),
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );
  $items['error-test/trigger-exception'] = array(
    'title' => 'Trigger an exception',
    'page callback' => 'error_test_trigger_exception',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );
  $items['error-test/trigger-pdo-exception'] = array(
    'title' => 'Trigger a PDO exception',
    'page callback' => 'error_test_trigger_pdo_exception',
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Menu callback; generate warnings to test the error handler.
 */
function error_test_generate_warnings($collect_errors = FALSE) {
  // Tell Drupal error reporter to send errors to Simpletest or not.
  define('SIMPLETEST_COLLECT_ERRORS', $collect_errors);
  // This will generate a notice.
  $monkey_love = $bananas;
  // This will generate a warning.
  $awesomely_big = 1/0;
  // This will generate a user error.
  trigger_error("Drupal is awesome", E_USER_WARNING);
  return "";
}

/**
 * Menu callback; trigger an exception to test the exception handler.
 */
function error_test_trigger_exception() {
  define('SIMPLETEST_COLLECT_ERRORS', FALSE);
  throw new Exception("Drupal is awesome");
}

/**
 * Menu callback; trigger an exception to test the exception handler.
 */
function error_test_trigger_pdo_exception() {
  define('SIMPLETEST_COLLECT_ERRORS', FALSE);
  db_query('SELECT * FROM bananas_are_awesome');
}