public static <T extends Closeable> CloseableReference<T> eqUnderlying(
      CloseableReference<T> closeableReference) {
    return argThat(new CloseableReferenceMatcher<T>(closeableReference));
  }
Returns a Mockito ArgumentMatcher that checks that its argument has the same underlying {@link
SharedReference}
imagepipeline/src/test/java/com/facebook/imagepipeline/memory/CloseableReferences.java