Store handles with data inside Messages when Connector receives messages

mojo/python/tests/messaging_unittest.py

Index: mojo/python/tests/messaging_unittest.py
diff --git a/mojo/python/tests/messaging_unittest.py b/mojo/python/tests/messaging_unittest.py
index 767ba745f36d901bf0824a9e48aae70daf3a4519..e09532f0c423576fc8b10afa0a38ab73228a9e5a 100644
--- a/mojo/python/tests/messaging_unittest.py
+++ b/mojo/python/tests/messaging_unittest.py
@@ -45,6 +45,8 @@ class ConnectorTest(mojo_unittest.MojoTestCase):
   def tearDown(self):
     self.connector = None
     self.handle = None
+    self.received_messages = []
+    self.received_errors = []
     super(ConnectorTest, self).tearDown()
 
   def testConnectorRead(self):
@@ -72,6 +74,14 @@ class ConnectorTest(mojo_unittest.MojoTestCase):
     (result, _, _) = self.handle.ReadMessage()
     self.assertEquals(result, system.RESULT_FAILED_PRECONDITION)
 
+  def testConnectorWriteHandle(self):
+    new_handles = system.MessagePipe()
+    self.handle.WriteMessage(None, [new_handles.handle0])
+    self.loop.RunUntilIdle()
+    self.assertTrue(self.received_messages)
+    self.assertTrue(self.received_messages[0].handles)
+    self.assertFalse(self.received_errors)
+
 
 class HeaderTest(unittest.TestCase):