tests/test-execute-bit.t

tests: cover revision conversion logic in githelp tests

There was no test involving actual conversion of option values when they
contain a git revision name (to be converted as a hg one by
hgext.githelp.convert()). Adding one. This test would fail on Python 3
without https://phab.mercurial-scm.org/D7537.

Differential Revision: https://phab.mercurial-scm.org/D7540

#require execbit

  $ hg init
  $ echo a > a
  $ hg ci -Am'not executable'
  adding a

  $ chmod +x a
  $ hg ci -m'executable'
  $ hg id
  79abf14474dc tip

Make sure we notice the change of mode if the cached size == -1:

  $ hg rm a
  $ hg revert -r 0 a
  $ hg debugstate
  n   0         -1 unset               a
  $ hg status
  M a

  $ hg up 0
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ hg id
  d69afc33ff8a
  $ test -x a && echo executable -- bad || echo not executable -- good
  not executable -- good