Add tox environments for testing ZODB integration and ZODB integration in...

Add tox environments for testing ZODB integration and ZODB integration in pure-python mode; run one of these environments on Travis. This reveals a bug in the new ContainedProxy object: it must be weakly referencable to go in the picklecache, so make that possible.

.travis.yml

@@ -6,6 +6,7 @@ env:
     - TOXENV=pypy
     - TOXENV=py33
     - TOXENV=py34
+    - TOXENV=py27-pure-zodb
 install:
     - pip install tox
 script:

src/zope/container/_proxy.py

@@ -35,7 +35,7 @@ def _special_name(name):
 class PyContainedProxyBase(AbstractPyProxyBase, Persistent):
     """Persistent proxy
     """
-    __slots__ = ('_wrapped', '__parent__', '__name__')
+    __slots__ = ('_wrapped', '__parent__', '__name__', '__weakref__')
 
     def __new__(cls, obj):
         inst = super(PyContainedProxyBase, cls).__new__(cls, obj)

tox.ini

 [tox]
-envlist = py26,py27,pypy,py33,py34,docs
+envlist = py26,py27,pypy,py33,py34,py27-zodb,pypy-zodb,py27-pure-zodb,docs
 
 [testenv]
 commands = python setup.py -q test -q
@@ -23,6 +23,29 @@ deps =
     zope.testrunner
     zope.testing
 
+[testenv:py27-zodb]
+basepython =
+    python2.7
+deps =
+    {[testenv]deps}
+    ZODB
+
+[testenv:py27-pure-zodb]
+basepython =
+    python2.7
+setenv =
+    PURE_PYTHON = 1
+deps =
+    {[testenv]deps}
+    ZODB
+
+[testenv:pypy-zodb]
+basepython =
+    pypy
+deps =
+    {[testenv]deps}
+    ZODB
+
 [testenv:coverage]
 usedevelop = true
 basepython =