tests/test-empty.t

rank: compute property incrementally

This replaces the naive rank computation with a more efficient incremental
method, avoiding computing the whole ancestor set when possible.

Differential Revision: https://phab.mercurial-scm.org/D12143

Create an empty repo:

  $ hg init a
  $ cd a

Try some commands:

  $ hg log
  $ hg grep wah
  [1]
  $ hg manifest
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 0 changesets with 0 changes to 0 files

Check the basic files created:

  $ ls .hg
  00changelog.i
  cache
  requires
  store
  wcache

Should be empty (except for the "basic" requires):

  $ ls .hg/store
  requires

Poke at a clone:

  $ cd ..
  $ hg clone a b
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cd b
  $ hg verify
  checking changesets
  checking manifests
  crosschecking files in changesets and manifests
  checking files
  checked 0 changesets with 0 changes to 0 files
  $ ls .hg
  00changelog.i
  cache
  dirstate
  hgrc
  requires
  store
  wcache

Should be empty (except for the "basic" requires):

  $ ls .hg/store
  requires

  $ cd ..