test that a commit clears the merge state.

  $ hg init repo

  $ cd repo

  $ echo foo > file

  $ hg commit -Am 'add file'

  adding file

  $ echo bar >> file

  $ hg commit -Am 'append bar'

create a second head

  $ hg up -C 0

  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ echo baz >> file

  $ hg commit -Am 'append baz'

  created new head

failing merge

  $ HGMERGE=internal:fail hg merge

  0 files updated, 0 files merged, 0 files removed, 1 files unresolved

  use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon

  $ echo resolved > file

  $ hg resolve -m file

  $ hg commit -m 'resolved'

resolve -l, should be empty

  $ hg resolve -l

test crashed merge with empty mergestate

  $ mkdir .hg/merge

  $ touch .hg/merge/state

resolve -l, should be empty

  $ hg resolve -l