private void setUpCacheEnabled(boolean enabled) {
    when(mImageRequest.isCacheEnabled(ImageRequest.CachesLocationsMasks.BITMAP_READ))
        .thenReturn(enabled);
    when(mImageRequest.isCacheEnabled(ImageRequest.CachesLocationsMasks.BITMAP_WRITE))
        .thenReturn(enabled);
  }
Checks basic properties of 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
of higher quality, 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/BitmapMemoryCacheProducerTest.java