asyncio: sync with Tulip

* PipeHandle now uses None instead of -1 for a closed handle
* Sort imports in windows_utils.
* Fix test_events on Python older than 3.5. Skip SSL tests on the
  ProactorEventLoop if ssl.MemoryIO is missing
* Fix BaseEventLoop._create_connection_transport(). Close the transport if the
  creation of the transport (if the waiter) gets an exception.
* _ProactorBasePipeTransport now sets _sock to None when the transport is
  closed.
* Fix BaseSubprocessTransport.close(). Ignore pipes for which the protocol is
  not set yet (still equal to None).
* TestLoop.close() now calls the close() method of the parent class
  (BaseEventLoop).
* Cleanup BaseSelectorEventLoop: create the protocol on a separated line for
  readability and ease debugging.
* Fix BaseSubprocessTransport._kill_wait(). Set the _returncode attribute, so
  close() doesn't try to terminate the process.
* Tests: explicitly close event loops and transports
* UNIX pipe transports: add closed/closing in repr(). Add "closed" or "closing"
  state in the __repr__() method of _UnixReadPipeTransport and
  _UnixWritePipeTransport classes.

Lib/test/test_asyncio/test_base_events.py

@@ -409,6 +409,7 @@ class BaseEventLoopTests(test_utils.TestCase):
     def test_run_until_complete_loop(self):
         task = asyncio.Future(loop=self.loop)
         other_loop = self.new_test_loop()
+        self.addCleanup(other_loop.close)
         self.assertRaises(ValueError,
             other_loop.run_until_complete, task)
 

Lib/test/test_asyncio/test_events.py

@@ -25,6 +25,7 @@ import weakref
 import asyncio
 from asyncio import proactor_events
 from asyncio import selector_events
+from asyncio import sslproto
 from asyncio import test_utils
 try:
     from test import support
@@ -1585,6 +1586,7 @@ class SubprocessTestsMixin:
         self.assertTrue(all(f.done() for f in proto.disconnects.values()))
         self.assertEqual(proto.data[1].rstrip(b'\r\n'), b'Python')
         self.assertEqual(proto.data[2], b'')
+        transp.close()
 
     def test_subprocess_exitcode(self):
         connect = self.loop.subprocess_shell(
@@ -1594,6 +1596,7 @@ class SubprocessTestsMixin:
         self.assertIsInstance(proto, MySubprocessProtocol)
         self.loop.run_until_complete(proto.completed)
         self.assertEqual(7, proto.returncode)
+        transp.close()
 
     def test_subprocess_close_after_finish(self):
         connect = self.loop.subprocess_shell(
@@ -1621,6 +1624,7 @@ class SubprocessTestsMixin:
         transp.kill()
         self.loop.run_until_complete(proto.completed)
         self.check_killed(proto.returncode)
+        transp.close()
 
     def test_subprocess_terminate(self):
         prog = os.path.join(os.path.dirname(__file__), 'echo.py')
@@ -1635,6 +1639,7 @@ class SubprocessTestsMixin:
         transp.terminate()
         self.loop.run_until_complete(proto.completed)
         self.check_terminated(proto.returncode)
+        transp.close()
 
     @unittest.skipIf(sys.platform == 'win32', "Don't have SIGHUP")
     def test_subprocess_send_signal(self):
@@ -1650,6 +1655,7 @@ class SubprocessTestsMixin:
         transp.send_signal(signal.SIGHUP)
         self.loop.run_until_complete(proto.completed)
         self.assertEqual(-signal.SIGHUP, proto.returncode)
+        transp.close()
 
     def test_subprocess_stderr(self):
         prog = os.path.join(os.path.dirname(__file__), 'echo2.py')
@@ -1784,6 +1790,22 @@ if sys.platform == 'win32':
         def create_event_loop(self):
             return asyncio.ProactorEventLoop()
 
+        if not sslproto._is_sslproto_available():
+            def test_create_ssl_connection(self):
+                raise unittest.SkipTest("need python 3.5 (ssl.MemoryBIO)")
+
+            def test_create_server_ssl(self):
+                raise unittest.SkipTest("need python 3.5 (ssl.MemoryBIO)")
+
+            def test_create_server_ssl_verify_failed(self):
+                raise unittest.SkipTest("need python 3.5 (ssl.MemoryBIO)")
+
+            def test_create_server_ssl_match_failed(self):
+                raise unittest.SkipTest("need python 3.5 (ssl.MemoryBIO)")
+
+            def test_create_server_ssl_verified(self):
+                raise unittest.SkipTest("need python 3.5 (ssl.MemoryBIO)")
+
         def test_legacy_create_ssl_connection(self):
             raise unittest.SkipTest("IocpEventLoop incompatible with legacy SSL")
 

Lib/test/test_asyncio/test_futures.py

@@ -29,6 +29,7 @@ class FutureTests(test_utils.TestCase):
 
     def setUp(self):
         self.loop = self.new_test_loop()
+        self.addCleanup(self.loop.close)
 
     def test_initial_state(self):
         f = asyncio.Future(loop=self.loop)

Lib/test/test_asyncio/test_selector_events.py

@@ -1744,6 +1744,7 @@ class SelectorDatagramTransportTests(test_utils.TestCase):
             test_utils.MockPattern(
                 'Fatal error on transport\nprotocol:.*\ntransport:.*'),
             exc_info=(ConnectionRefusedError, MOCK_ANY, MOCK_ANY))
+        transport.close()
 
 
 if __name__ == '__main__':

Lib/test/test_asyncio/test_unix_events.py

@@ -598,6 +598,7 @@ class UnixWritePipeTransportTests(test_utils.TestCase):
         # This is a bit overspecified. :-(
         m_log.warning.assert_called_with(
             'pipe closed by peer or os.write(pipe, data) raised exception.')
+        tr.close()
 
     @mock.patch('os.write')
     def test_write_close(self, m_write):