node/test/simple/test-event-emitter-max-listeners.js

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var common = require('../common');
var assert = require('assert');
var events = require('events');

var gotEvent = false;

process.on('exit', function() {
  assert(gotEvent);
});

var e = new events.EventEmitter();

e.on('maxListeners', function() {
  gotEvent = true;
});

// Should not corrupt the 'maxListeners' queue.
e.setMaxListeners(42);

assert.throws(function() {
  e.setMaxListeners(NaN);
});

assert.throws(function() {
  e.setMaxListeners(-1);
});

assert.throws(function() {
  e.setMaxListeners("and even this");
});

e.emit('maxListeners');