chore: add tests for node:async_hooks (#18004)

Closes https://github.com/denoland/deno/issues/17878

---------

Co-authored-by: crowlkats <crowlkats@toaxl.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/cli/tests/unit_node/async_hooks_test.ts b/cli/tests/unit_node/async_hooks_test.ts
new file mode 100644
index 000000000..73d6a99bc
--- /dev/null
+++ b/cli/tests/unit_node/async_hooks_test.ts
@@ -0,0 +1,83 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+import { AsyncLocalStorage, AsyncResource } from "node:async_hooks";
+import {
+  assert,
+  assertEquals,
+} from "../../../test_util/std/testing/asserts.ts";
+import { deferred } from "../../../test_util/std/async/deferred.ts";
+
+Deno.test(async function foo() {
+  const asyncLocalStorage = new AsyncLocalStorage();
+
+  const out: string[] = [];
+  function logWithId(msg: string) {
+    const id = asyncLocalStorage.getStore();
+    out.push(`${id !== undefined ? id : "-"}: ${msg}`);
+  }
+
+  async function exec() {
+    logWithId("start");
+    await new Promise((resolve) => setTimeout(resolve, 100));
+    logWithId("finish");
+  }
+
+  for (const foo of [1, 2, 3]) {
+    asyncLocalStorage.run(foo, exec);
+  }
+
+  await new Promise((resolve) => setTimeout(resolve, 500));
+
+  assertEquals(out, [
+    "1: start",
+    "2: start",
+    "3: start",
+    "1: finish",
+    "2: finish",
+    "3: finish",
+  ]);
+});
+
+Deno.test(async function bar() {
+  let differentScopeDone = false;
+  const als = new AsyncLocalStorage();
+  const ac = new AbortController();
+  const server = Deno.serve(() => {
+    const differentScope = als.run(123, () =>
+      AsyncResource.bind(() => {
+        differentScopeDone = true;
+      }));
+    return als.run("Hello World", async () => {
+      // differentScope is attached to a different async context, so
+      // it will see a different value for als.getStore() (123)
+      setTimeout(differentScope, 5);
+      // Some simulated async delay.
+      await new Promise((res) => setTimeout(res, 10));
+      return new Response(als.getStore() as string); // "Hello World"
+    });
+  }, {
+    signal: ac.signal,
+    port: 4000,
+  });
+
+  const res = await fetch("http://localhost:4000");
+  assertEquals(await res.text(), "Hello World");
+  ac.abort();
+  await server;
+  assert(differentScopeDone);
+});
+
+Deno.test(async function nested() {
+  const als = new AsyncLocalStorage();
+  const promise = deferred();
+  const promise1 = deferred();
+
+  als.run(null, () => {
+    als.run({ x: 1 }, () => {
+      promise.resolve(als.getStore());
+    });
+    promise1.resolve(als.getStore());
+  });
+
+  assertEquals(await promise, { x: 1 });
+  assertEquals(await promise1, null);
+});