@Test
  public void testGetPriority() {
    mMultiplexProducer.produceResults(mConsumer1, mProducerContext1);
    assertEquals(Priority.MEDIUM, mMultiplexedContext1.getPriority());
  }
An extra flag to check we maintain other flags than just whether this is the last result
imagepipeline/src/test/java/com/facebook/imagepipeline/producers/MultiplexProducerTest.java