Temporary workarounds for 2.7 and PyPy issues

.travis.yml

@@ -9,6 +9,8 @@ python:
 install:
     - pip install -U pip setuptools
     - pip install -U coverage coveralls
+    # workaround https://github.com/zopefoundation/BTrees/issues/70
+    - pip install -U --no-binary ":all:" persistent
     - pip install -e  git+https://github.com/zopefoundation/zope.proxy.git#egg=zope.proxy
     - pip install -U -e .[test]
 script:

src/zope/app/container/browser/tests/__init__.py

@@ -6,6 +6,10 @@
 
 from zope import component
 
+from zope.security.interfaces import ForbiddenAttribute
+from zope.security.proxy import Proxy
+from zope.security.checker import Checker, CheckerPublic
+
 def provideAdapter(required, provided, factory):
     gsm = component.getGlobalSiteManager()
     gsm.registerAdapter(factory, [required], provided, event=False)
@@ -26,6 +30,24 @@ def setUp(self):
         component.getGlobalSiteManager().registerUtility(PrincipalAnnotationUtility(),
                                                          IPrincipalAnnotationUtility)
 
+        # Temporarily check for and workaround (if needed) the issue with
+        # security checkers of BTreeItems on PyPy.
+        # https://github.com/zopefoundation/zope.security/issues/20
+        import BTrees
+        tree = BTrees.OOBTree.OOBTree()
+        tree['a'] = 42
+
+        checker = Checker({'items': CheckerPublic})
+        proxy = Proxy(tree, checker)
+        items = proxy.items()
+        try:
+            list(items)
+        except ForbiddenAttribute:
+            checker = Checker({'__iter__': CheckerPublic})
+            import BTrees._base
+            BTrees._base._TreeItems.__Security_checker__ = checker
+            self.addCleanup(lambda: delattr(BTrees._base._TreeItems, '__Security_checker__'))
+
     def publish(self, path, basic=None, form=None):
         if basic:
             self._testapp.authorization = ('Basic', tuple(basic.split(':')))