[Updated] D8782: tests: make flag parsing test more future safe

[indygreg (Gregory Szorc)]

This revision is now accepted and ready to land.
indygreg accepted this revision.

REPOSITORY
  rHG Mercurial

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D8782/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D8782

To: joerg.sonnenberger, #hg-reviewers, indygreg
Cc: mercurial-patches
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