implement 'wss-rw' luau test to ensure we can read and write to sockets

tests/net/socket/wss-rw.luau

@@ -0,0 +1,26 @@
+local net = require("@lune/net")
+local process = require("@lune/process")
+local task = require("@lune/task")
+
+-- We're going to use Discord's WebSocket gateway server
+-- for testing that we can both read from a stream,
+-- as well as write to the same stream concurrently
+local socket = net.socket("wss://gateway.discord.gg/?v=10&encoding=json")
+
+task.spawn(function()
+	while not socket.closeCode do
+		socket.next()
+	end
+end)
+
+task.delay(1, function()
+	socket.send('{"op":1,"d":null}')
+	socket.close(1000)
+
+	process.exit(1)
+end)
+
+task.wait(5)
+
+task.defer(process.exit, 1)
+error("`socket.send` halted, failed to write to socket")