nebulab-dropbox

describe 'Dropbox.Util.EventSource', -> beforeEach -> @source = new Dropbox.Util.EventSource @cancelable = new Dropbox.Util.EventSource cancelable: true # 3 listeners, 1 and 2 are already hooked up @event1 = null @listener1 = (event) => @event1 = event @listener1.returnValue @listener1.returnValue = true @source.addListener @listener1 @cancelable.addListener @listener1 @event2 = null @listener2 = (event) => @event2 = event @listener2.returnValue @listener2.returnValue = false @source.addListener @listener2 @cancelable.addListener @listener2 @event3 = null @listener3 = (event) => @event3 = event @listener3.returnValue @listener3.returnValue = true describe '#addListener', -> it 'adds a new listener', -> @source.addListener @listener3 expect(@source._listeners).to.deep. equal [@listener1, @listener2, @listener3] it 'does not add an existing listener', -> @source.addListener @listener2 expect(@source._listeners).to.deep.equal [@listener1, @listener2] it 'is idempotent', -> @source.addListener @listener3 @source.addListener @listener3 expect(@source._listeners).to.deep. equal [@listener1, @listener2, @listener3] it 'refuses to add non-functions', -> expect(=> @source.addListener 42).to.throw(TypeError, /listener type/) describe '#removeListener', -> it 'does nothing for a non-existing listener', -> @source.removeListener @listener3 expect(@source._listeners).to.deep.equal [@listener1, @listener2] it 'removes a listener at the end of the queue', -> @source.removeListener @listener2 expect(@source._listeners).to.deep.equal [@listener1] it 'removes a listener at the beginning of the queue', -> @source.removeListener @listener1 expect(@source._listeners).to.deep.equal [@listener2] it 'removes a listener at the middle of the queue', -> @source.addListener @listener3 @source.removeListener @listener2 expect(@source._listeners).to.deep.equal [@listener1, @listener3] it 'removes all the listeners', -> @source.removeListener @listener1 @source.removeListener @listener2 expect(@source._listeners).to.deep.equal [] describe 'without ES5 Array#indexOf', -> beforeEach -> @source._listeners.indexOf = null afterEach -> delete @source._listeners.indexOf assertArraysEqual = (array1, array2) -> expect(array1.length).to.equal(array2.length) for i in [0...array1.length] expect(array1[i]).to.equal(array2[i]) it 'does nothing for a non-existing listener', -> @source.removeListener @listener3 assertArraysEqual @source._listeners, [@listener1, @listener2] it 'removes a listener at the end of the queue', -> @source.removeListener @listener2 assertArraysEqual @source._listeners, [@listener1] it 'removes a listener at the beginning of the queue', -> @source.removeListener @listener1 assertArraysEqual @source._listeners, [@listener2] it 'removes a listener at the middle of the queue', -> @source.addListener @listener3 @source.removeListener @listener2 assertArraysEqual @source._listeners, [@listener1, @listener3] it 'removes all the listeners', -> @source.removeListener @listener1 @source.removeListener @listener2 assertArraysEqual @source._listeners, [] describe '#dispatch', -> beforeEach -> @event = { answer: 42 } it 'passes event to all listeners', -> @source.dispatch @event expect(@event1).to.equal @event expect(@event2).to.equal @event expect(@event3).to.equal null describe 'on non-cancelable events', -> beforeEach -> @source.addListener @listener3 @returnValue = @source.dispatch @event it 'calls all the listeners', -> expect(@event1).to.equal @event expect(@event2).to.equal @event expect(@event3).to.equal @event it 'ignores the listener return values', -> expect(@returnValue).to.equal true describe 'on cancelable events', -> beforeEach -> @cancelable.addListener @listener3 @returnValue = @cancelable.dispatch @event it 'stops calling listeners after cancelation', -> expect(@event1).to.equal @event expect(@event2).to.equal @event expect(@event3).to.equal null it 'reports cancelation', -> expect(@returnValue).to.equal false it 'calls all listeners if no cancelation occurs', -> @listener2.returnValue = true @returnValue = @cancelable.dispatch @event expect(@returnValue).to.equal true expect(@event3).to.equal @event