Added interface-verification tests for managers

transaction/tests/test__manager.py

@@ -14,6 +14,10 @@
 import mock
 import unittest
 
+import zope.interface.verify
+
+from .. import interfaces
+
 
 class TransactionManagerTests(unittest.TestCase):
 
@@ -32,6 +36,10 @@ def _makePopulated(self):
         nosub1 = DataObject(mgr, nost=1)
         return mgr, sub1, sub2, sub3, nosub1
 
+    def test_interface(self):
+        zope.interface.verify.verifyObject(interfaces.ITransactionManager,
+                                           self._makeOne())
+
     def test_ctor(self):
         tm = self._makeOne()
         self.assertTrue(tm._txn is None)
@@ -698,6 +706,11 @@ def run(self):
 
 class TestThreadTransactionManager(unittest.TestCase):
 
+    def test_interface(self):
+        import transaction
+        zope.interface.verify.verifyObject(interfaces.ITransactionManager,
+                                           transaction.manager)
+
     def test_sync_registration_thread_local_manager(self):
         import transaction