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test: ensure removeListener event fires for once() listeners
Adds test coverage for the removeListener event being emitted
when a once() listener is automatically removed after execution.
This verifies that streams and other EventEmitters correctly
emit removeListener events when once() wrappers clean up.
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Han5991 committed Oct 9, 2025
commit e04ddfc92a8fffa79d91ddeb5eaf338a3f73054d
16 changes: 16 additions & 0 deletions test/parallel/test-event-emitter-remove-listeners.js
Original file line number Diff line number Diff line change
Expand Up @@ -168,3 +168,19 @@ function listener2() {}
ee.removeListener('foo', listener1);
assert.strictEqual(ee._events.foo, listener2);
}

{
const { Writable } = require('stream');
const stream = new Writable({
write(chunk, encoding, callback) {
callback();
}
});

stream.on('removeListener', common.mustCall((eventName, listener) => {
assert.strictEqual(eventName, 'finish');
}));

stream.once('finish', common.mustCall());
stream.end();
}