test: move common.fires() to inspector-helper

common.fires() is specific to the inspector tests so move it to
inspector-helper.js. The one REPL test that used common.fires() does not
seem to need it. It provided a 1 second timeout for operations, but that
timeout appears both arbitrary and ineffective as the test passes if it
is reduced to even 1 millisecond.

PR-URL: https://github.com/nodejs/node/pull/17401
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 39 insertions, 2 deletions

diff --git a/test/common/inspector-helper.js b/test/common/inspector-helper.js
index 454eef4c5e..8fc778555d 100644
--- a/test/common/inspector-helper.js
+++ b/test/common/inspector-helper.js
@@ -216,7 +216,7 @@ class InspectorSession {
   waitForNotification(methodOrPredicate, description) {
     const desc = description || methodOrPredicate;
     const message = `Timed out waiting for matching notification (${desc}))`;
-    return common.fires(
+    return fires(
       this._asyncWaitForNotification(methodOrPredicate), message, TIMEOUT);
   }
 
@@ -323,7 +323,7 @@ class NodeInstance {
     const instance = new NodeInstance(
       [], `${scriptContents}\nprocess._rawDebug('started');`, undefined);
     const msg = 'Timed out waiting for process to start';
-    while (await common.fires(instance.nextStderrString(), msg, TIMEOUT) !==
+    while (await fires(instance.nextStderrString(), msg, TIMEOUT) !==
              'started') {}
     process._debugProcess(instance._process.pid);
     return instance;
@@ -412,6 +412,43 @@ function readMainScriptSource() {
   return fs.readFileSync(_MAINSCRIPT, 'utf8');
 }
 
+function onResolvedOrRejected(promise, callback) {
+  return promise.then((result) => {
+    callback();
+    return result;
+  }, (error) => {
+    callback();
+    throw error;
+  });
+}
+
+function timeoutPromise(error, timeoutMs) {
+  let clearCallback = null;
+  let done = false;
+  const promise = onResolvedOrRejected(new Promise((resolve, reject) => {
+    const timeout = setTimeout(() => reject(error), timeoutMs);
+    clearCallback = () => {
+      if (done)
+        return;
+      clearTimeout(timeout);
+      resolve();
+    };
+  }), () => done = true);
+  promise.clear = clearCallback;
+  return promise;
+}
+
+// Returns a new promise that will propagate `promise` resolution or rejection
+// if that happens within the `timeoutMs` timespan, or rejects with `error` as
+// a reason otherwise.
+function fires(promise, error, timeoutMs) {
+  const timeout = timeoutPromise(error, timeoutMs);
+  return Promise.race([
+    onResolvedOrRejected(promise, () => timeout.clear()),
+    timeout
+  ]);
+}
+
 module.exports = {
   mainScriptPath: _MAINSCRIPT,
   readMainScriptSource,