diff -r 9ac8df41dde7 Lib/test/test_asynchat.py
--- a/Lib/test/test_asynchat.py	Fri Jun 05 21:03:08 2015 -0500
+++ b/Lib/test/test_asynchat.py	Sat Jun 06 15:31:36 2015 +0200
@@ -30,6 +30,7 @@
             # This will be set if the client wants us to wait before echoing data
             # back.
             self.start_resend_event = None
+            self.received_len = 0
 
         def run(self):
             self.sock.listen(1)
@@ -41,6 +42,7 @@
                 data = conn.recv(1)
                 if not data:
                     break
+                self.received_len += len(data)
                 self.buffer = self.buffer + data
 
             # remove the SERVER_QUIT message
@@ -230,10 +232,7 @@
         s.join()
 
         self.assertEqual(c.contents, [])
-        # the server might have been able to send a byte or two back, but this
-        # at least checks that it received something and didn't just fail
-        # (which could still result in the client not having received anything)
-        self.assertTrue(len(s.buffer) > 0)
+        self.assertTrue(s.received_len > 0)
 
 
 class TestAsynchat_WithPoll(TestAsynchat):