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

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

        FessConfig yearConfig = new FessConfig.SimpleImpl() {