function test_set_error_handlers()
 {
     $handlers = array('test');
     $old_handlers = Environmentalist::set_error_handlers($handlers);
     assert_equal($handlers, Environmentalist::error_handlers());
     assert_equal($this->error_handlers, $old_handlers);
 }
 /**
  * Sets the current registered error handlers to the array of handlers specified.
  * Returns the old registered error handlers.
  *
  * @param array $handlers
  * @return array
  **/
 static function set_error_handlers($handlers)
 {
     $old_handlers = self::error_handlers();
     self::$error_handlers = array_unique($handlers);
     return $old_handlers;
 }