Tuple3<String, String, String> task = thumbnailGenerator.createTask(path, docMap);
        assertNull(task);
    }

    @Test
    public void test_multipleGenerations() {
        // Test multiple thumbnail generations
        for (int i = 0; i < 5; i++) {
            String thumbnailId = "test-thumbnail-" + i;
            File outputFile = new File(tempDir.toFile(), "thumbnail-" + i + ".png");

bulance\u000bassociation\nballooning\u0003caa\u0005cargo\rcertification\u000cchampionship\u0007charter\rcivilaviation\nconference\nconsultant\u0007control\u0007council\u0004crew\u0004dgca\u0008educator\u0009emergency\u0006engine\rentertainment\nfederation\u0006flight\u0007freight\u0004fuel\u0007gliding\ngovernment\u000egroundhandling\u000bhanggliding\u0009homebuilt\u0007journal\njournalist\u0007leasing\u0009logistics\u0008magazine\u000bmaintenance\u000bmarketplace\nmicrolight\u0009modelling\nnav...