assertEquals(Level.ERROR, result.getLevel());
    }

    public void test_createPolicy_with_null_logger_name_prefix() {
        ErrorToWarnRewritePolicy policy = ErrorToWarnRewritePolicy.createPolicy(null);

        assertNotNull(policy);

        LogEvent event = Log4jLogEvent.newBuilder()
                .setLoggerName("any.logger")
                .setLevel(Level.ERROR)

     *
     * @param loggerNamePrefix comma-separated list of logger name prefixes
     * @return a new ErrorToWarnRewritePolicy instance
     */
    @PluginFactory
    public static ErrorToWarnRewritePolicy createPolicy(@PluginAttribute("loggers") final String loggerNamePrefix) {
        final String[] loggerNames = loggerNamePrefix != null