$ cat >> $HGRCPATH <<EOF

  > [defaults]

  > amend=-d "0 0"

  > [extensions]

  > hgext.rebase=

  > hgext.graphlog=

  > EOF

  $ echo "evolve=$(echo $(dirname $TESTDIR))/hgext/evolve.py" >> $HGRCPATH

  $ glog() {

  >   hg glog --template '{rev}@{branch}({phase}) {desc|firstline}\n' "$@"

  > }

  $ hg init repo --traceback

  $ cd repo

  $ echo a > a

  $ hg ci -Am adda

  adding a

Test amend captures branches

  $ hg branch foo

  marked working directory as branch foo

  (branches are permanent and global, did you want a bookmark?)

  $ hg amend

  $ hg debugobsolete

  $ hg branch

  foo

  $ hg branches

  $ glog

  @  2@foo(draft) adda

Test no-op

  $ hg amend

  $ glog

  @  2@foo(draft) adda

Test forcing the message to the same value, no intermediate revision.

  $ hg amend -m 'adda'

  $ glog

  @  2@foo(draft) adda

Test collapsing into an existing revision, no intermediate revision.

  $ echo a >> a

  $ hg ci -m changea

  $ echo a > a

  $ hg status

  M a

  $ hg pstatus

  $ hg diff

  --- a/a	Thu Jan 01 00:00:00 1970 +0000

  +++ b/a	* +0000 (glob)

  @@ -1,2 +1,1 @@

   a

  -a

  $ hg pdiff

  $ hg ci -m reseta

  $ hg debugobsolete

  $ hg phase 2

  2: draft

  $ glog

  @  4@foo(draft) reseta

  |

  o  3@foo(draft) changea

  |

  o  2@foo(draft) adda