test(ext/node): add worker_threads test for SharedArrayBuffer (#22850)

Follow up to https://github.com/denoland/deno/pull/22815

2 files changed, 37 insertions, 0 deletions

diff --git a/tests/unit_node/testdata/worker_threads2.mjs b/tests/unit_node/testdata/worker_threads2.mjs
new file mode 100644
index 000000000..52d906bdf
--- /dev/null
+++ b/tests/unit_node/testdata/worker_threads2.mjs
@@ -0,0 +1,17 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { parentPort, workerData } from "node:worker_threads";
+import { once } from "node:events";
+
+async function message(expectedMessage) {
+  const [message] = await once(parentPort, "message");
+  if (message !== expectedMessage) {
+    console.log(`Expected the message "${expectedMessage}", but got`, message);
+    // fail test
+    parentPort.close();
+  }
+}
+
+const uint = new Uint8Array(workerData.sharedArrayBuffer);
+uint[0]++;
+await message("Hello");
+parentPort.postMessage("Hello");
diff --git a/tests/unit_node/worker_threads_test.ts b/tests/unit_node/worker_threads_test.ts
index bc451e33f..1ded9a591 100644
--- a/tests/unit_node/worker_threads_test.ts
+++ b/tests/unit_node/worker_threads_test.ts
@@ -218,3 +218,23 @@ Deno.test({
     clearTimeout(timeout);
   },
 });
+
+Deno.test({
+  name: "[worker_threads] SharedArrayBuffer",
+  async fn() {
+    const sab = new SharedArrayBuffer(Uint8Array.BYTES_PER_ELEMENT);
+    const uint = new Uint8Array(sab);
+    const worker = new workerThreads.Worker(
+      new URL("./testdata/worker_threads2.mjs", import.meta.url),
+      {
+        workerData: { sharedArrayBuffer: sab },
+      },
+    );
+    worker.postMessage("Hello");
+    if ((await once(worker, "message"))[0] != "Hello") throw new Error();
+    await new Promise((resolve) => setTimeout(resolve, 100));
+    worker.terminate();
+    if (uint[0] != 1) throw new Error();
+  },
+  sanitizeResources: false,
+});