tests/test-merge-subrepos.t

hghave: check darcs version more strictly

test-convert-darcs.t suddenly started failing on my Debian sid machine. The
reason was Darcs was upgraded from 2.12.0 to 2.12.4 so the original pattern
got to match the last two digits. Fix the pattern to match 2.2+.

  $ hg init

  $ echo a > a
  $ hg ci -qAm 'add a'

  $ hg init subrepo
  $ echo 'subrepo = http://example.net/libfoo' > .hgsub
  $ hg ci -qAm 'added subrepo'

  $ hg up -qC 0
  $ echo ax > a
  $ hg ci -m 'changed a'
  created new head

  $ hg up -qC 1
  $ cd subrepo
  $ echo b > b
  $ hg add b
  $ cd ..

Should fail, since there are added files to subrepo:

  $ hg merge
  abort: uncommitted changes in subrepository 'subrepo'
  [255]