### Question:
SubTaskBuilder { public static final List<ProcessingJobSubTask> colourExtraction() { return Arrays.asList( new ProcessingJobSubTask(ProcessingJobSubTaskType.COLOR_EXTRACTION, null)); }  static final List<ProcessingJobSubTask> thumbnailGeneration(); static final List<ProcessingJobSubTask> metaExtraction(); static final List<ProcessingJobSubTask> colourExtraction();  }### Answer:
@Test public void test_colorExtraction() { final List<ProcessingJobSubTask> subTasks = SubTaskBuilder.colourExtraction(); assertEquals (1, subTasks.size()); assertEquals (ProcessingJobSubTaskType.COLOR_EXTRACTION, subTasks.get(0).getTaskType()); assertNull (subTasks.get(0).getConfig()); }