Added backportsclone test package to test bug #6.

src/z3c/autoinclude/dependency.txt

@@ -22,6 +22,7 @@ for the requirements of that distribution::
     >>> pprint(sorted(reqs, key=lambda r:r.project_name))
     [Requirement.parse('BCPackage'),
      Requirement.parse('TestDirective'),
+     Requirement.parse('backportsclone'),
      Requirement.parse('z3c.autoinclude')]
 
 We can turn this requirement into a distribution::

src/z3c/autoinclude/tests/APackage/setup.py

@@ -22,6 +22,7 @@
         'BCPackage',
 	'z3c.autoinclude',
 	'TestDirective',
+	'backportsclone',
       ],
       entry_points="""
       # -*- Entry points: -*-

src/z3c/autoinclude/tests/backportsclone/setup.py

@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+from distutils.core import setup
+setup(name='backportsclone',
+      version='1.0',
+      description='Namespace for backported Python features',
+      long_description=u"""\
+Copy of the empty backports package.
+See https://pypi.org/project/backports/
+and code: https://bitbucket.org/brandon/backports
+
+I (Maurits van Rees) am seeing problems in z3c.autoinclude with this.
+See https://github.com/zopefoundation/z3c.autoinclude/issues/6
+So I copied it to backportsclone so I can test with it.
+
+To continue a part of the original readme:
+
+
+Building your own backports module
+----------------------------------
+
+Placing a module of your own inside of the ``backports`` namespace
+requires only a few simple steps. First, set your project up like::
+
+    project/
+    project/setup.py
+    project/backports/
+    project/backports/__init__.py   <--- SPECIAL - see below!
+    project/backports/yourpkg/
+    project/backports/yourpkg/__init__.py
+    project/backports/yourpkg/foo.py
+    project/backports/yourpkg/bar.py
+
+This places your own package inside of the ``backports`` namespace,
+so your package and its modules can be imported like this::
+
+    import backports.yourpkg
+    import backports.yourpkg.foo
+
+The one **absolutely essential rule** is that the ``__init__.py`` inside
+of the ``backports`` directory itself **must** have the following code
+as its content::
+
+    # A Python "namespace package" http://www.python.org/dev/peps/pep-0382/
+    # This always goes inside of a namespace package's __init__.py
+
+    from pkgutil import extend_path
+    __path__ = extend_path(__path__, __name__)
+
+If you fail to include this code, then the namespace package might fail
+to see all of the packages beneath it, and ``import`` statements might
+return errors.
+
+A live example of a package that implements all of this can be
+downloaded from the Python Package Index:
+
+http://pypi.python.org/pypi/backports.ssl_match_hostname/3.2a3
+
+""",
+      author='Brandon Craig Rhodes and Maurits van Rees',
+      author_email='info@example.org',
+      url='http://bitbucket.org/brandon/backports',
+      # packages=['backportsclone'],
+      )

src/z3c/autoinclude/tests/tests.py

@@ -16,7 +16,9 @@
 test_packages = ['APackage', 'BCPackage', 'XYZPackage',
                  'SiblingPackage', 'BasePackage', 'FooPackage',
                  'base2', 'base2_plug', 'TestDirective',
-                 'enolp.ppa.foo', 'enolp.ppa.bar']
+                 'enolp.ppa.foo', 'enolp.ppa.bar',
+                 'backportsclone',
+                 ]
 
 
 from zc.buildout.easy_install import install