@@ -258,6 +258,18 @@ def __fspath__(self):
         with self.assertRaisesRegex(TypeError, r"expected C.__fspath__\(\) to return str or bytes, not bytearray"):
             os.open(C(), 0)
 
+    def test_open_bytes_path(self):
+        try:
+            with open(os.fsencode(TEST_FULL_PATH1), os.O_WRONLY | os.O_CREAT) as fd:
+                os.write(fd, b'hello')
+            with open(os.fsencode(TEST_FULL_PATH1), os.O_RDONLY) as fd:
+                self.assertEqual(b'hello', os.read(fd, 5))
+        finally:
+            try:
+                os.unlink(TEST_FULL_PATH1)
+            except Exception:
+                pass
+
     def test_fd_converter(self):
         class MyInt(int):
             def fileno(self): return 0
 
@@ -110,3 +110,33 @@ def server():
         sock.recv_into(buffer, 1)
         assert b == b'123'
     thread.join()
+
+
+def test_sendto_recvfrom_roundtrip():
+    try:
+        if __graalpython__.posix_module_backend() == "java":
+            return
+    except NameError:
+        pass
+
+    with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as server:
+        server.bind(("127.0.0.1", 0))
+        server_addr = server.getsockname()
+
+        with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as client:
+            client.bind(("127.0.0.1", 0))
+            client_addr = client.getsockname()
+
+            sent = client.sendto(b"phase5", server_addr)
+            assert sent == 6
+
+            data, addr = server.recvfrom(64)
+            assert data == b"phase5"
+            assert addr == client_addr
+
+            sent = server.sendto(b"reply", client_addr)
+            assert sent == 5
+
+            data, addr = client.recvfrom(64)
+            assert data == b"reply"
+            assert addr == server_addr