// Both logs should be well-formed
        assertNotNull(memoryLog1);
        assertNotNull(memoryLog2);
        assertTrue(memoryLog1.contains("Mem:"));
        assertTrue(memoryLog2.contains("Mem:"));
    }

    // Custom test class for fallback object testing
    private static class CustomTestObject {
        @SuppressWarnings("unused")
        private final String field = "test";

        final long freeMemory = Runtime.getRuntime().freeMemory();
        final String msg = String.format(
                "%d words from %d %s: {\"time\":{\"parse\":%d,\"index\":%d},\"cpu\":%f,\"mem\":{\"heap\":\"%dmb\",\"used\":\"%dmb\"}}",
                items.length, size, type, parseTime, indexTime, cpuLoad, maxMemory / (1024 * 1024),
                (maxMemory - freeMemory) / (1024 * 1024));
        logger.info(msg);