test,worker: verify that .terminate() breaks microtask queue

PR-URL: #25480
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: addaleax

test/parallel/test-worker-terminate-microtask-loop.js

@@ -0,0 +1,19 @@
+'use strict';
+constcommon=require('../common');
+constassert=require('assert');
+const{ Worker }=require('worker_threads');
+
+// Verify that `.terminate()` interrupts the microtask queue.
+
+constworker=newWorker(`
+function loop() { Promise.resolve().then(loop); } loop();
+require('worker_threads').parentPort.postMessage('up');
+`,{eval: true});
+
+worker.once('message',common.mustCall(()=>{
+setImmediate(()=>worker.terminate());
+}));
+
+worker.once('exit',common.mustCall((code)=>{
+assert.strictEqual(code,1);
+}));