The following used to work in Python 2.4.x but fails
under Python 2.5:

>>> import setuptools
>>> import distutils.core
>>> distutils.core._setup_stop_after = 'config'
>>> 
>>> import setup
>>> setup.dist.run_command('test')

Where setup.dist is an instance of
distutils.core.Distribution (which setuptools replaces
with setuptools.dist.Distribution).

Under Python 2.4.x, this code would execute setuptools'
test command. Under Python 2.5b2 (as of r50855), this
code results in the following exception:

/opt/dev/python/2.5/lib/python2.5/distutils/dist.py:263:
UserWarning: Unknown distribution option: 'test_suite'
  warnings.warn(msg)
Traceback (most recent call last):
  File "test.py", line 8, in <module>
    setup.dist.run_command('test')
  File
"/opt/dev/python/2.5/lib/python2.5/distutils/dist.py",
line 992, in run_command
    cmd_obj = self.get_command_obj(command)
  File
"/opt/dev/python/2.5/lib/python2.5/distutils/dist.py",
line 868, in get_command_obj
    klass = self.get_command_class(command)
  File
"/opt/dev/python/2.5/lib/python2.5/site-packages/setuptools/dist.py",
line 357, in get_command_class
    return _Distribution.get_command_class(self, command)
  File
"/opt/dev/python/2.5/lib/python2.5/distutils/dist.py",
line 851, in get_command_class
    raise DistutilsModuleError("invalid command '%s'" %
command)
distutils.errors.DistutilsModuleError: invalid command
'test'

I'd greatly appreciate it if this regression could be
fixed before Python 2.5 is released.