public RingbufferConfig setAsyncBackupCount(int asyncBackupCount) {
        this.asyncBackupCount = checkAsyncBackupCount(backupCount, asyncBackupCount);
        return this;
    }
@Test
    public void setAsyncBackupCount() {
        RingbufferConfig config = new RingbufferConfig(NAME);

        config.setAsyncBackupCount(4);

        assertEquals(4, config.getAsyncBackupCount());
    }