diff -ur PyProtocols.orig/src/protocols/tests/__init__.py PyProtocols/src/protocols/tests/__init__.py
--- src/protocols/tests/__init__.py	2007-04-25 12:15:46.000000000 +0800
+++ src/protocols/tests/__init__.py	2013-04-10 19:22:28.720647271 +0800
@@ -256,22 +256,6 @@
         makeSuite(GenerationTests,'check'),
     ]
 
-    try:
-        import zope.interface
-    except ImportError:
-        pass
-    else:
-        from protocols.tests import test_zope
-        tests.append( test_zope.test_suite() )
-
-    try:
-        from twisted.python.components import Interface
-    except (ImportError, SystemError):
-        pass
-    else:
-        from protocols.tests import test_twisted
-        tests.append( test_twisted.test_suite() )
-
     return TestSuite(
         tests
     )