assertEquals(TimeZone.getDefault(), FessUserTimeZoneProcessProvider.centralTimeZone);

        // Verify it's the same instance for all provider instances
        FessUserTimeZoneProcessProvider provider1 = new FessUserTimeZoneProcessProvider();
        FessUserTimeZoneProcessProvider provider2 = new FessUserTimeZoneProcessProvider();

        }
    }

    // Test centralTimeZone reference
    @Test
    public void test_centralTimeZone() {
        // Test that centralTimeZone is accessible and not null
        TimeZone centralTz = FessUserTimeZoneProcessProvider.centralTimeZone;
        assertNotNull(centralTz);
        assertEquals(TimeZone.getDefault(), centralTz);
    }

    // Test toString method
    @Test
    public void test_toString() {