report: add support for Workers

Include a report for each sub-Worker of the current Node.js instance.

This adds a feature that is necessary for eventually making the report
feature stable, as was discussed during the last collaborator summit.

Refs: https://github.com/openjs-foundation/summit/pull/240

PR-URL: https://github.com/nodejs/node/pull/31386
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 50 insertions, 0 deletions

diff --git a/test/report/test-report-worker.js b/test/report/test-report-worker.js
new file mode 100644
index 00000000000..a34c05f0843
--- /dev/null
+++ b/test/report/test-report-worker.js
@@ -0,0 +1,50 @@
+// Flags: --experimental-report
+'use strict';
+const common = require('../common');
+common.skipIfReportDisabled();
+const assert = require('assert');
+const { Worker } = require('worker_threads');
+const { once } = require('events');
+const helper = require('../common/report');
+
+async function basic() {
+  // Test that the report includes basic information about Worker threads.
+
+  const w = new Worker(`
+    const { parentPort } = require('worker_threads');
+    parentPort.once('message', () => {
+      /* Wait for message to stop the Worker */
+    });
+  `, { eval: true });
+
+  await once(w, 'online');
+
+  const report = process.report.getReport();
+  helper.validateContent(report);
+  assert.strictEqual(report.workers.length, 1);
+  helper.validateContent(report.workers[0]);
+
+  w.postMessage({});
+
+  await once(w, 'exit');
+}
+
+async function interruptingJS() {
+  // Test that the report also works when Worker threads are busy in JS land.
+
+  const w = new Worker('while (true);', { eval: true });
+
+  await once(w, 'online');
+
+  const report = process.report.getReport();
+  helper.validateContent(report);
+  assert.strictEqual(report.workers.length, 1);
+  helper.validateContent(report.workers[0]);
+
+  await w.terminate();
+}
+
+(async function() {
+  await basic();
+  await interruptingJS();
+})().then(common.mustCall());