Merge de12a4c into 9d64102

.travis.yml

@@ -1,5 +1,9 @@
 language: python
 
+env:
+  global:
+    ZOPE_INTERFACE_STRICT_IRO: 1
+
 python:
   - 2.7
   - 3.5

CHANGES.rst

@@ -4,7 +4,8 @@ Changes
 4.6.1 (unreleased)
 ------------------
 
-- Nothing changed yet.
+- Ensure the resolution order of ``BaseGlobalComponents`` is
+  consistent. See `issue 45 <https://github.com/zopefoundation/zope.component/issues/45>`_.
 
 
 4.6 (2019-11-12)

src/zope/component/globalregistry.py

@@ -37,7 +37,7 @@ def __init__(self, parent, name):
     def __reduce__(self):
         return GAR, (self.__parent__, self.__name__)
 
-@implementer(IComponentLookup)
+
 class BaseGlobalComponents(Components):
 
     def _init_registries(self):

src/zope/component/tests/test_globalregistry.py

@@ -244,3 +244,31 @@ class IFoo(Interface):
         self.assertEqual(list(hr.required), [IFoo])
         self.assertEqual(hr.name, '')
         self.assertTrue(hr.factory is _handler)
+
+
+class TestBaseGlobalComponents(unittest.TestCase):
+
+    from zope.component.testing import setUp, tearDown
+
+    def _getTargetClass(self):
+        from zope.component.globalregistry import BaseGlobalComponents
+        return BaseGlobalComponents
+
+    def _getTargetInterfaces(self):
+        from zope.interface.interfaces import IComponentLookup
+        from zope.interface.interfaces import IComponents
+        from zope.interface.interfaces import IComponentRegistry
+        return [IComponents, IComponentLookup, IComponentRegistry]
+
+    def _makeOne(self):
+        return self._getTargetClass()()
+
+    def test_verifyInstance(self):
+        from zope.interface.verify import verifyObject
+        for iface in self._getTargetInterfaces():
+            verifyObject(iface, self._makeOne())
+
+    def test_verifyClass(self):
+        from zope.interface.verify import verifyClass
+        for iface in self._getTargetInterfaces():
+            verifyClass(iface, self._getTargetClass())

tox.ini

@@ -19,6 +19,8 @@ deps =
 commands =
     zope-testrunner --test-path=src
     sphinx-build -b doctest -d {envdir}/.cache/doctrees docs {envdir}/.cache/doctest
+setenv =
+    ZOPE_INTERFACE_STRICT_IRO = 1
 
 [testenv:py27-minimal]
 basepython =
@@ -28,24 +30,20 @@ deps =
 commands =
     zope-testrunner --test-path=src
 
-[testenv:py34-pure]
-basepython =
-    python3.4
-setenv =
-    PURE_PYTHON = 1
-    PIP_CACHE_DIR = {envdir}/.cache
 
 [testenv:py35-pure]
 basepython =
     python3.5
 setenv =
+    {[testenv]setenv}
     PURE_PYTHON = 1
     PIP_CACHE_DIR = {envdir}/.cache
 
 [testenv:py27-pure]
 basepython =
     python3.4
 setenv =
+    {[testenv]setenv}
     PURE_PYTHON = 1
     PIP_CACHE_DIR = {envdir}/.cache