assertFalse(generator.isGenerateCalled());
        assertTrue(generator.generate("id123", outputFile));
        assertTrue(generator.isGenerateCalled());
    }

    public void test_destroy() {
        // Test destroy method is called correctly
        generator = new TestThumbnailGenerator();

        assertFalse(generator.isDestroyCalled());
        generator.destroy();

        assertFalse(emptyGenerator.generate(null, outputFile));
        assertFalse(emptyGenerator.generate("thumbnailId", null));
        assertFalse(emptyGenerator.generate(null, null));
    }

    public void test_destroy() {
        // Initialize without container
        emptyGenerator = new EmptyGenerator();

        // Test that destroy method can be called without error
        emptyGenerator.destroy();

    }

    public void test_isAvailable() {
        // Test availability check
        assertTrue(thumbnailGenerator.isAvailable());
    }

    public void test_destroy() {
        // Test destroy method - should not throw exception
        thumbnailGenerator.destroy();
        // After destroy, generator should not be available
        assertFalse(thumbnailGenerator.isAvailable());

        // Skip this test as it requires container components
        // The process method needs actual ThumbnailQueueBhv and other components
        assertTrue(true);
    }

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

    // Test purge with expired files
    public void test_purge_withExpiredFiles() throws IOException {

            }
        };

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

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

    // Test doFilter when WebApiManagerFactory returns null WebApiManager