LogEvent result = policy.rewrite(event);

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

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

        assertNotNull(policy);

        LogEvent event = Log4jLogEvent.newBuilder()