asyncio: Fix spelling and typos.

Thanks to Vajrasky Kok for discovering some of them.

Lib/test/test_asyncio/test_base_events.py

@@ -277,7 +277,7 @@ class BaseEventLoopTests(unittest.TestCase):
             asyncio.SubprocessProtocol, *args, bufsize=4096)
 
     def test_subprocess_shell_invalid_args(self):
-        # exepected a string, not an int or a list
+        # expected a string, not an int or a list
         self.assertRaises(TypeError,
             self.loop.run_until_complete, self.loop.subprocess_shell,
             asyncio.SubprocessProtocol, 123)

Lib/test/test_asyncio/test_events.py

@@ -503,7 +503,6 @@ class EventLoopTestsMixin:
         tr, pr = self.loop.run_until_complete(connection_fut)
         self.assertIsInstance(tr, asyncio.Transport)
         self.assertIsInstance(pr, asyncio.Protocol)
-        self.assertIsNotNone(tr.get_extra_info('sockname'))
         self.loop.run_until_complete(pr.done)
         self.assertGreater(pr.nbytes, 0)
         tr.close()

Lib/test/test_asyncio/test_futures.py

@@ -38,7 +38,7 @@ class FutureTests(unittest.TestCase):
             asyncio.set_event_loop(None)
 
     def test_constructor_positional(self):
-        # Make sure Future does't accept a positional argument
+        # Make sure Future doesn't accept a positional argument
         self.assertRaises(TypeError, asyncio.Future, 42)
 
     def test_cancel(self):

Lib/test/test_asyncio/test_streams.py

@@ -239,7 +239,7 @@ class StreamReaderTests(unittest.TestCase):
         # No b'\n' at the end. The 'limit' is set to 3. So before
         # waiting for the new data in buffer, 'readline' will consume
         # the entire buffer, and since the length of the consumed data
-        # is more than 3, it will raise a ValudError. The buffer is
+        # is more than 3, it will raise a ValueError. The buffer is
         # expected to be empty now.
         self.assertEqual(b'', stream._buffer)
 

Lib/test/test_asyncio/test_unix_events.py

@@ -965,7 +965,7 @@ class ChildWatcherTestsMixin:
         self.assertFalse(m.WEXITSTATUS.called)
         self.assertFalse(m.WTERMSIG.called)
 
-        # childen are running
+        # children are running
         self.watcher._sig_chld()
 
         self.assertFalse(callback1.called)
@@ -1069,7 +1069,7 @@ class ChildWatcherTestsMixin:
         self.assertFalse(m.WEXITSTATUS.called)
         self.assertFalse(m.WTERMSIG.called)
 
-        # childen are running
+        # children are running
         self.watcher._sig_chld()
 
         self.assertFalse(callback1.called)
@@ -1425,7 +1425,7 @@ class ChildWatcherTestsMixin:
         self.add_zombie(61, 11)
         self.add_zombie(62, -5)
 
-        # SIGCHLD was not catched
+        # SIGCHLD was not caught
         self.assertFalse(callback1.called)
         self.assertFalse(callback2.called)
         self.assertFalse(callback3.called)