view tests/test-diff-issue2761.t @ 37367:87c4253bebdb

py3: suppress the output of open() using `and None`

This patch suppresses the output of open() on Python 3 as it does not return any
output on Python 2.

This makes test-diffstat.t pass on Python 3.5

Differential Revision: https://phab.mercurial-scm.org/D3128

Test issue2761

  $ hg init

  $ touch to-be-deleted
  $ hg add
  adding to-be-deleted
  $ hg ci -m first
  $ echo a > to-be-deleted
  $ hg ci -m second
  $ rm to-be-deleted
  $ hg diff -r 0

Same issue, different code path

  $ hg up -C
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ touch does-not-exist-in-1
  $ hg add
  adding does-not-exist-in-1
  $ hg ci -m third
  $ rm does-not-exist-in-1
  $ hg diff -r 1