// Generous tolerance for CI environments like GitHub Actions
        assertTrue("Expected less than 200ms sleep, got " + elapsed + "ms", elapsed < 200);
    }

    @Test
    public void test_waitForNext_withZeroInterval() {
        configHelper.setReloadInterval(0L);

        long startTime = System.currentTimeMillis();
        configHelper.waitForNext();
        long endTime = System.currentTimeMillis();