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var common = require('../common');
var assert = require('assert');
var events = require('events');
function expect(expected) {
var actual = [];
process.on('exit', function() {
assert.deepEqual(actual.sort(), expected.sort());
});
function listener(name) {
actual.push(name)
}
return common.mustCall(listener, expected.length);
}
function listener() {}
var e1 = new events.EventEmitter();
e1.on('foo', listener);
e1.on('bar', listener);
e1.on('baz', listener);
e1.on('baz', listener);
var fooListeners = e1.listeners('foo');
var barListeners = e1.listeners('bar');
var bazListeners = e1.listeners('baz');
e1.on('removeListener', expect(['bar', 'baz', 'baz']));
e1.removeAllListeners('bar');
e1.removeAllListeners('baz');
assert.deepEqual(e1.listeners('foo'), [listener]);
assert.deepEqual(e1.listeners('bar'), []);
assert.deepEqual(e1.listeners('baz'), []);
// after calling removeAllListeners,
// the old listeners array should stay unchanged
assert.deepEqual(fooListeners, [listener]);
assert.deepEqual(barListeners, [listener]);
assert.deepEqual(bazListeners, [listener, listener]);
// after calling removeAllListeners,
// new listeners arrays are different from the old
assert.notEqual(e1.listeners('bar'), barListeners);
assert.notEqual(e1.listeners('baz'), bazListeners);
var e2 = new events.EventEmitter();
e2.on('foo', listener);
e2.on('bar', listener);
// expect LIFO order
e2.on('removeListener', expect(['foo', 'bar', 'removeListener']));
e2.on('removeListener', expect(['foo', 'bar']));
e2.removeAllListeners();
console.error(e2);
assert.deepEqual([], e2.listeners('foo'));
assert.deepEqual([], e2.listeners('bar'));
var e3 = new events.EventEmitter();
e3.on('removeListener', listener);
// check for regression where removeAllListeners throws when
// there exists a removeListener listener, but there exists
// no listeners for the provided event type
assert.doesNotThrow(e3.removeAllListeners.bind(e3, 'foo'));
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