This test requires parentrevspec support in revsets, so check for that

and skip the test if we're on an unusual hg that supports .t tests but

not parentrevspec.

  $ python -c 'from mercurial import revset ; revset.methods["parentpost"]' || exit 80

Enable extensions used by this test.

  $ cat >>$HGRCPATH <<EOF

  > [extensions]

  > graphlog=

  > histedit=

  > EOF

Repo setup.

  $ hg init foo

  $ cd foo

  $ echo alpha >> alpha

  $ hg addr

  adding alpha

  $ hg ci -m one

  $ echo alpha >> alpha

  $ hg ci -m two

  $ echo alpha >> alpha

  $ hg ci -m three

  $ echo alpha >> alpha

  $ hg ci -m four

  $ echo alpha >> alpha

  $ hg ci -m five

  $ hg log --style compact --graph

  @  4[tip]   08d98a8350f3   1970-01-01 00:00 +0000   test

  |    five

  |

  o  3   c8e68270e35a   1970-01-01 00:00 +0000   test

  |    four

  |

  o  2   eb57da33312f   1970-01-01 00:00 +0000   test

  |    three

  |

  o  1   579e40513370   1970-01-01 00:00 +0000   test

  |    two

  |

  o  0   6058cbb6cfd7   1970-01-01 00:00 +0000   test

       one

Run a dummy edit to make sure we get tip^^ correctly via revsingle.

  $ HGEDITOR=cat hg histedit tip^^

  pick eb57da33312f 2 three

  pick c8e68270e35a 3 four

  pick 08d98a8350f3 4 five

  # Edit history between eb57da33312f and 08d98a8350f3

  #

  # Commands:

  #  p, pick = use commit

  #  e, edit = use commit, but stop for amending

  #  f, fold = use commit, but fold into previous commit (combines N and N-1)

  #  d, drop = remove commit from history

  #  m, mess = edit message without changing commit content

  #

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