assertNotNull(providers[i], "Thread " + i + " failed to create provider");
        }
    }

    // Test with very large time adjustment values
    @Test
    public void test_largeTimeAdjustmentValues() {
        // Test with milliseconds in a year
        long yearInMillis = 365L * 24L * 60L * 60L * 1000L;

        FessConfig yearConfig = new FessConfig.SimpleImpl() {