D7075: copies: add an explicit test using multiple roots

[marmoute (Pierre-Yves David)]

marmoute added inline comments.

INLINE COMMENTS

> martinvonz wrote in test-copies-unrelated.t:403-406
> nit: These seem unlikely to have any effect on the result. remove them? Or at least one of them? OTOH, you seem to have deliberately made the contents match in revision 2 and revision 7. What's the reason for that? Did that trigger a bug in an earlier version of this series?

I don't want to write too simple test. There are various optimisation to have around revision without copy informations. So I am adding them in various situation to cache potential error if we introduce such optimisation.

The content match is just here so that `hg merge does not complains about a content conflicT)

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7075/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7075

To: marmoute, #hg-reviewers
Cc: martinvonz, mercurial-devel