Skips handling of "file not found" errors.
public function fileNotFoundErrorHandler($error_level, $message, $filename, $line, $context) {
// Skip error handling if this is a "file not found" error.
if (strpos($message, 'is missing from the file system:') !== FALSE || strpos($message, 'has moved within the file system:') !== FALSE) {
$this->getFilenameTestTriggeredError = $message;
return;
}
_drupal_error_handler($error_level, $message, $filename, $line, $context);
}