tests/test-empty-dir.t

run-tests: initial support for running tests with unittest

The unittest package in Python's standard library provides an almost
universal mechanism for defining and running tests. This patch starts
the process of making run-tests.py talk to it.

The main benefit of speaking unittest is that this will enable
Mercurial's tests to be more easily consumed by other testing tools,
like nose. This is useful for 3rd party extensions having their own
test infrastructure, for example.

Running tests in unittest mode will not result in completely sane
behavior until the unittest mode is made the default execution mode.
Expect things like double printing of output until support stabilizes.

  $ hg init

  $ echo 123 > a
  $ hg add a
  $ hg commit -m "first" a

  $ mkdir sub
  $ echo 321 > sub/b
  $ hg add sub/b
  $ hg commit -m "second" sub/b

  $ cat sub/b
  321

  $ hg co 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

  $ cat sub/b 2>/dev/null || echo "sub/b not present"
  sub/b not present

  $ test -d sub || echo "sub not present"
  sub not present