fix udp BorrowMutError (#6221)

1 files changed, 15 insertions, 0 deletions

diff --git a/cli/tests/unit/net_test.ts b/cli/tests/unit/net_test.ts
index 4fd253a6c..cda5a536e 100644
--- a/cli/tests/unit/net_test.ts
+++ b/cli/tests/unit/net_test.ts
@@ -255,6 +255,21 @@ unitTest(
 );
 
 unitTest(
+  { ignore: Deno.build.os === "windows", perms: { net: true } },
+  async function netUdpBorrowMutError(): Promise<void> {
+    const socket = Deno.listenDatagram({
+      port: 4501,
+      transport: "udp",
+    });
+    // Panic happened on second send: BorrowMutError
+    const a = socket.send(new Uint8Array(), socket.addr);
+    const b = socket.send(new Uint8Array(), socket.addr);
+    await Promise.all([a, b]);
+    socket.close();
+  }
+);
+
+unitTest(
   { ignore: Deno.build.os === "windows", perms: { read: true, write: true } },
   async function netUnixPacketSendReceive(): Promise<void> {
     const filePath = await Deno.makeTempFile();