Update.

test/websocket/large_binary.wren

@@ -0,0 +1,69 @@
+// retoor <retoor@molodetz.nl>
+
+import "websocket" for WebSocket, WebSocketServer
+import "scheduler" for Scheduler
+import "timer" for Timer
+
+var port = 19877
+var payloadSize = 3 * 1024 * 1024
+var result = "pending"
+
+Scheduler.add {
+  var server = WebSocketServer.bind("127.0.0.1", port)
+  var ws = server.accept()
+
+  if (ws != null) {
+    var msg = ws.receive()
+    if (msg != null && msg.isBinary) {
+      ws.sendBinary(msg.bytes)
+    }
+    ws.close()
+  }
+  server.close()
+}
+
+Timer.sleep(50)
+
+Scheduler.add {
+  var ws = WebSocket.connect("ws://127.0.0.1:%(port)")
+
+  var payload = []
+  var i = 0
+  while (i < payloadSize) {
+    payload.add(i % 256)
+    i = i + 1
+  }
+
+  ws.sendBinary(payload)
+
+  var response = ws.receive()
+
+  if (response == null) {
+    result = "error: no response"
+  } else if (!response.isBinary) {
+    result = "error: not binary"
+  } else if (response.bytes.count != payloadSize) {
+    result = "error: size mismatch %(response.bytes.count) != %(payloadSize)"
+  } else {
+    var mismatch = false
+    i = 0
+    while (i < payloadSize) {
+      if (response.bytes[i] != (i % 256)) {
+        mismatch = true
+        break
+      }
+      i = i + 1
+    }
+    if (mismatch) {
+      result = "error: data mismatch at %(i)"
+    } else {
+      result = "ok"
+    }
+  }
+
+  ws.close()
+}
+
+Timer.sleep(30000)
+
+System.print(result) // expect: ok