Minimal hgk check

  $ echo "[extensions]" >> $HGRCPATH

  $ echo "hgk=" >> $HGRCPATH

  $ hg init repo

  $ cd repo

  $ echo a > a

  $ hg ci -Am adda

  adding a

  $ hg debug-cat-file commit 0

  tree a0c8bcbbb45c

  parent 000000000000

  author test 0 0

  revision 0

  branch default

  phase draft

  adda

  $ echo b > b

  $ hg ci -Am addb

  adding b

  $ hg log -T '{node}\n'

  102a90ea7b4a3361e4082ed620918c261189a36a

  07f4944404050f47db2e5c5071e0e84e7a27bba9

  $ hg debug-diff-tree 07f494440405 102a90ea7b4a

  :000000 100664 000000000000 1e88685f5dde N	b	b

  $ hg debug-diff-tree 07f494440405 102a90ea7b4a --patch

  diff --git a/b b/b

  new file mode 100644

  --- /dev/null

  +++ b/b

  @@ -0,0 +1,1 @@

  +b

Ensure that diff-tree output isn't affected by diffopts

  $ hg --config diff.noprefix=True debug-diff-tree 07f494440405 102a90ea7b4a

  :000000 100664 000000000000 1e88685f5dde N	b	b

  $ hg --config diff.noprefix=True debug-diff-tree --patch 07f494440405 102a90ea7b4a

  diff --git a/b b/b

  new file mode 100644

  --- /dev/null

  +++ b/b

  @@ -0,0 +1,1 @@

  +b

  $ cd ..