How to find out if Remapper / ClassRemapper actually remapped anything?

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Hello.

This might be a naive question, but is there a simple (or not so simple,
if necessary) way to find out if a ClassRemapper or Remapper actually
did remap anything?

Background: I am using Maven Shade Plugin, which in turn uses ASM in
order to implement relocating packages. For that purpose is provides a

>>> RelocatorRemapper extends Remapper

If a plugin configuration contains any relocation rules, Maven Shade
will either replace package names in Java source files or - if the
target file is a class file - pass the class through to Remapper in
order too do the magic. So far, so good, this works nicely.

Now here is my problem: In build verification steps I would like to
check which classes were actually remapped, at least for some expected
relocations. Negative tests would check thatt other classes remain
unchanged. But the latter does not work, because Shade passes through
all classes, which often changes them, because e.g. the constant pool
gets overwritten, even if no actual relocation took place because the
target class neither needs to be relocated itself nor imports/references
another relocated class. But still, the byte code looks different, i.e.
a simple checksum comparison between the class files before and after
the (basically and semantically no-op) relocation yields a difference.

My idea was to try and create a pull request for Maven Shade which
writes the original class into the resulting JAR file, if the relocator
(and hence the remapper) did not effectively change anything. Do you
have any suggestion how to do that?

Thanks in advance
-- 
Alexander Kriegisch
https://scrum-master.de

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