@Test
  public void testCacheMiss_UnderlyingNull() {
    Consumer consumer = performCacheMiss();
    consumer.onNewResult(null, Consumer.IS_LAST);
    verify(mConsumer).onNewResult(null, Consumer.IS_LAST);
  }
Checks basic properties of post-processed bitmap memory cache producer operation, that is: - it
delegates to the {@link MemoryCache#get(Object)} - if {@link MemoryCache#get(Object)} is
unsuccessful, then it passes the request to the next producer in the sequence. - if the next
producer returns the value, then it is put into the bitmap cache. - responses from the next
producer are passed back down to the consumer.
imagepipeline/src/test/java/com/facebook/imagepipeline/producers/PostprocessedBitmapMemoryCacheProducerTest.java