Pierre-Yves David <pierre-yves.david@octobus.net> [Sun, 06 Oct 2019 23:36:51 -0400] rev 43139
sidedatacopies: introduce a sidedata testcase for test-copies.t
For now it is equivalent to the filelog case, but introducing this early helps
make the comings changesets clearer.
Differential Revision: https://phab.mercurial-scm.org/D6947