Support more ServerProxy options.

`use_builtin_types` is in particular handy for the migration to Python 3 as it returns a `xmlrpc.client.Binary` instead of bytes. This class is not present in Python 2.

CHANGES.rst

@@ -5,7 +5,7 @@
 4.3.0 (unreleased)
 ==================
 
-- Nothing changed yet.
+- Support options `use_datetime` and `use_builtin_types` of ``ServerProxy``.
 
 
 4.2.0 (2019-12-05)

setup.py

@@ -111,7 +111,10 @@ def _read(fname):
       ],
       extras_require={
           'test': tests_require,
-          'testing': 'zope.app.wsgi',
+          'testing': [
+              'six',
+              'zope.app.wsgi',
+          ]
       },
       tests_require=tests_require,
       zip_safe=False,

src/zope/app/publisher/xmlrpc/testing.py

@@ -9,6 +9,7 @@
     import http.client as httplib
 
 from io import BytesIO
+import six
 
 from zope.app.wsgi.testlayer import http as _http
 
@@ -87,12 +88,17 @@ def request(self, host, handler, request_body, verbose=0):
 
 
 def ServerProxy(wsgi_app, uri, transport=None, encoding=None,
-                verbose=0, allow_none=0, handleErrors=True):
+                verbose=0, allow_none=0, handleErrors=True,
+                use_datetime=False, use_builtin_types=False):
     """A factory that creates a server proxy using the ZopeTestTransport
     by default.
     """
+    transport_options = dict(use_datetime=use_datetime)
+    if six.PY3:
+        # use_builtin_types is only available since 3.3
+        transport_options['use_builtin_types'] = use_builtin_types
     if transport is None:
-        transport = ZopeTestTransport()
+        transport = ZopeTestTransport(**transport_options)
         transport.wsgi_app = wsgi_app
     if isinstance(transport, ZopeTestTransport):
         transport.handleErrors = handleErrors