Issue #28652: Make loop methods reject socket kinds they do not support.

Lib/test/test_asyncio/test_unix_events.py

@@ -280,6 +280,33 @@ class SelectorEventLoopUnixSocketTests(test_utils.TestCase):
                                         'A UNIX Domain Stream.*was expected'):
                 self.loop.run_until_complete(coro)
 
+    def test_create_unix_server_path_dgram(self):
+        sock = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
+        with sock:
+            coro = self.loop.create_unix_server(lambda: None, path=None,
+                                                sock=sock)
+            with self.assertRaisesRegex(ValueError,
+                                        'A UNIX Domain Stream.*was expected'):
+                self.loop.run_until_complete(coro)
+
+    @unittest.skipUnless(hasattr(socket, 'SOCK_NONBLOCK'),
+                         'no socket.SOCK_NONBLOCK (linux only)')
+    def test_create_unix_server_path_stream_bittype(self):
+        sock = socket.socket(
+            socket.AF_UNIX, socket.SOCK_STREAM | socket.SOCK_NONBLOCK)
+        with tempfile.NamedTemporaryFile() as file:
+            fn = file.name
+        try:
+            with sock:
+                sock.bind(fn)
+                coro = self.loop.create_unix_server(lambda: None, path=None,
+                                                    sock=sock)
+                srv = self.loop.run_until_complete(coro)
+                srv.close()
+                self.loop.run_until_complete(srv.wait_closed())
+        finally:
+            os.unlink(fn)
+
     def test_create_unix_connection_path_inetsock(self):
         sock = socket.socket()
         with sock: