}
        };

        // Should not throw any exception
        webApiFilter.init(filterConfig);
        assertTrue(true);
    }

    // Test destroy method
    @Test
    public void test_destroy() {
        // Should not throw any exception
        webApiFilter.destroy();
        assertTrue(true);
    }

    // Test doFilter when WebApiManagerFactory returns null WebApiManager
    @Test

        // The process method needs actual ThumbnailQueueBhv and other components
        assertTrue(true);
    }

    // Test destroy
    @Test
    public void test_destroy() {
        thumbnailManager.destroy();
        assertFalse(thumbnailManager.generating);
    }

    // Test purge with expired files
    @Test

        final long currentTime = systemHelper.getCurrentTimeAsLong();
        final long now = System.currentTimeMillis();
        assertTrue(Math.abs(currentTime - now) < 1000);
    }

    @Test
    public void test_destroy() {
        final AtomicReference<Boolean> hookExecuted = new AtomicReference<>(false);
        systemHelper.addShutdownHook(() -> hookExecuted.set(true));
        systemHelper.destroy();