Fix for the two remaining bugs:

diff --git a/Lib/test/test_asyncio/test_base_events.py b/Lib/test/test_asyncio/test_base_events.py
index 8d72df6a72..6489f50f27 100644
--- a/Lib/test/test_asyncio/test_base_events.py
+++ b/Lib/test/test_asyncio/test_base_events.py
@@ -1917,6 +1917,7 @@ class BaseLoopSendfileTests(test_utils.TestCase):
 
     def test_nonstream_socket(self):
         sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        sock.setblocking(False)
         self.addCleanup(sock.close)
         with self.assertRaisesRegex(ValueError, "only SOCK_STREAM type"):
             self.run_loop(self.loop.sock_sendfile(sock, self.file))
diff --git a/Lib/test/test_asyncio/test_tasks.py b/Lib/test/test_asyncio/test_tasks.py
index d2162c31b4..9b62d207e4 100644
--- a/Lib/test/test_asyncio/test_tasks.py
+++ b/Lib/test/test_asyncio/test_tasks.py
@@ -2470,7 +2470,7 @@ class CTask_Future_Tests(test_utils.TestCase):
         self.loop = asyncio.new_event_loop()
         try:
             fut = Fut(loop=self.loop)
-            self.loop.call_later(0.1, fut.set_result(1))
+            self.loop.call_later(0.1, fut.set_result, 1)
             task = asyncio.Task(coro(), loop=self.loop)
             res = self.loop.run_until_complete(task)
         finally:

---

Nathaniel: do you want to include these fixes in your PR as well?

Hum, I'm concerned that "self.loop.call_later(0.1, fut.set_result(1))" bug wasn't spotted previously.

I plan to always run the Python test suite (especially when running on our CIs) in the new Python 3.7 "development mode" (python3 -X dev) which enables asyncio debug mode. Are you ok with that?