Use the doctest module from the standard library and no longer depend on zope.testing.

CHANGES.txt

@@ -4,6 +4,8 @@ Changelog
 2.13.3 (unreleased)
 -------------------
 
+- Use the doctest module from the standard library and no longer depend on
+  zope.testing.
 
 2.13.2 (2010-04-04)
 -------------------

setup.py

@@ -36,7 +36,7 @@ setup(name='Acquisition',
                                            '_Acquisition.c')],
                              include_dirs=['include', 'src']),
                    ],
-      install_requires=['ExtensionClass', 'zope.interface', 'zope.testing'],
+      install_requires=['ExtensionClass', 'zope.interface'],
       include_package_data=True,
       zip_safe=False,
       )

src/Acquisition/tests.py

@@ -2436,7 +2436,7 @@ def test___parent__parent__circles():
     """
 
 import unittest
-from zope.testing.doctest import DocTestSuite, DocFileSuite
+from doctest import DocTestSuite, DocFileSuite
 
 def test_suite():
     return unittest.TestSuite((