docMap.put("mimetype", "application/pdf");

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

    @Test
    public void test_createTask_withNullDocMap() {
        // Test task creation with null document map
        String path = "/path/to/document.pdf";

        Tuple3<String, String, String> task = thumbnailGenerator.createTask(path, null);