Simulate an ECONNRESET error on a Node.js net.Socket instance

Question

I'm writing some unit tests and I'd like to simulate a connection loss (ECONNRESET) on a net.Socket instance as part of one of the tests.

What would be the best way to go about doing this?

Thanks

Answer 1

The way I went for in the end was as follows:

client.end();
client.emit('error', new Error('ECONNRESET'));

was all I needed for the purposes of the test

Answer 2

There is a bit more short-hand solution existing for such cases:

socket.destroy(new Error('ECONNRESET'))

According to socket.destroy([exception]) docs:

If exception is specified, an 'error' event will be emitted and any listeners for that event will receive exception as an argument.

Also, there is a subtle difference between end (it is possible the server will still send some data) and destroy (ensures that no more I/O activity happens on this socket). For ECONNRESET the latter would be the best choice as this code generally means abrupt peer disconnection and will error on subsequent writes.