}

    public void test_generate_withEmptyThumbnailId() {
        // Test generation with empty thumbnail ID
        assertFalse(thumbnailGenerator.generate("", tempOutputFile));
    }

    public void test_generate_withNullOutputFile() {
        // Test generation with null output file
        String thumbnailId = "test-thumbnail-002";
        assertFalse(thumbnailGenerator.generate(thumbnailId, null));
    }