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var { Emitter } = require('..');
function Custom() {
Emitter.call(this)
}
Custom.prototype.__proto__ = Emitter.prototype;
describe('Custom', function(){
describe('with Emitter.call(this)', function(){
it('should work', function(done){
var emitter = new Custom;
emitter.on('foo', done);
emitter.emit('foo');
})
})
})
describe('Emitter', function(){
describe('.on(event, fn)', function(){
it('should add listeners', function(){
var emitter = new Emitter;
var calls = [];
emitter.on('foo', function(val){
calls.push('one', val);
});
emitter.on('foo', function(val){
calls.push('two', val);
});
emitter.emit('foo', 1);
emitter.emit('bar', 1);
emitter.emit('foo', 2);
calls.should.eql([ 'one', 1, 'two', 1, 'one', 2, 'two', 2 ]);
})
it('should add listeners for events which are same names with methods of Object.prototype', function(){
var emitter = new Emitter;
var calls = [];
emitter.on('constructor', function(val){
calls.push('one', val);
});
emitter.on('__proto__', function(val){
calls.push('two', val);
});
emitter.emit('constructor', 1);
emitter.emit('__proto__', 2);
calls.should.eql([ 'one', 1, 'two', 2 ]);
})
})
describe('.once(event, fn)', function(){
it('should add a single-shot listener', function(){
var emitter = new Emitter;
var calls = [];
emitter.once('foo', function(val){
calls.push('one', val);
});
emitter.emit('foo', 1);
emitter.emit('foo', 2);
emitter.emit('foo', 3);
emitter.emit('bar', 1);
calls.should.eql([ 'one', 1 ]);
})
})
describe('.off(event, fn)', function(){
it('should remove a listener', function(){
var emitter = new Emitter;
var calls = [];
function one() { calls.push('one'); }
function two() { calls.push('two'); }
emitter.on('foo', one);
emitter.on('foo', two);
emitter.off('foo', two);
emitter.emit('foo');
calls.should.eql([ 'one' ]);
})
it('should work with .once()', function(){
var emitter = new Emitter;
var calls = [];
function one() { calls.push('one'); }
emitter.once('foo', one);
emitter.once('fee', one);
emitter.off('foo', one);
emitter.emit('foo');
calls.should.eql([]);
})
it('should work when called from an event', function(){
var emitter = new Emitter
, called
function b () {
called = true;
}
emitter.on('tobi', function () {
emitter.off('tobi', b);
});
emitter.on('tobi', b);
emitter.emit('tobi');
called.should.be.true;
called = false;
emitter.emit('tobi');
called.should.be.false;
});
})
describe('.off(event)', function(){
it('should remove all listeners for an event', function(){
var emitter = new Emitter;
var calls = [];
function one() { calls.push('one'); }
function two() { calls.push('two'); }
emitter.on('foo', one);
emitter.on('foo', two);
emitter.off('foo');
emitter.emit('foo');
emitter.emit('foo');
calls.should.eql([]);
})
it('should remove event array to avoid memory leak', function() {
var emitter = new Emitter;
var calls = [];
function cb() {}
emitter.on('foo', cb);
emitter.off('foo', cb);
emitter._callbacks.should.not.have.property('$foo');
})
it('should only remove the event array when the last subscriber unsubscribes', function() {
var emitter = new Emitter;
var calls = [];
function cb1() {}
function cb2() {}
emitter.on('foo', cb1);
emitter.on('foo', cb2);
emitter.off('foo', cb1);
emitter._callbacks.should.have.property('$foo');
})
})
describe('.off()', function(){
it('should remove all listeners', function(){
var emitter = new Emitter;
var calls = [];
function one() { calls.push('one'); }
function two() { calls.push('two'); }
emitter.on('foo', one);
emitter.on('bar', two);
emitter.emit('foo');
emitter.emit('bar');
emitter.off();
emitter.emit('foo');
emitter.emit('bar');
calls.should.eql(['one', 'two']);
})
})
describe('.listeners(event)', function(){
describe('when handlers are present', function(){
it('should return an array of callbacks', function(){
var emitter = new Emitter;
function foo(){}
emitter.on('foo', foo);
emitter.listeners('foo').should.eql([foo]);
})
})
describe('when no handlers are present', function(){
it('should return an empty array', function(){
var emitter = new Emitter;
emitter.listeners('foo').should.eql([]);
})
})
})
describe('.hasListeners(event)', function(){
describe('when handlers are present', function(){
it('should return true', function(){
var emitter = new Emitter;
emitter.on('foo', function(){});
emitter.hasListeners('foo').should.be.true;
})
})
describe('when no handlers are present', function(){
it('should return false', function(){
var emitter = new Emitter;
emitter.hasListeners('foo').should.be.false;
})
})
})
})
describe('Emitter(obj)', function(){
it('should mixin', function(done){
var proto = {};
Emitter(proto);
proto.on('something', done);
proto.emit('something');
})
})
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