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describe('pub sub', function(){
it('is able to provide a single event pubsub', function(){
var events = pubSub();
expect(events('somethingHappening').on).not.toBeUndefined();
});
it('is provides the same single when asked twice', function(){
var events = pubSub();
expect( events('somethingHappening'))
.toBe( events('somethingHappening'));
});
it('numeric event names are treated as equal', function(){
var events = pubSub();
expect( events(1))
.toBe( events(1));
});
it('different numeric event names are treated as equal', function(){
var events = pubSub();
expect( events(1))
.not.toBe( events(2));
});
it('is provides different singles for different event names', function(){
var events = pubSub();
expect( events('somethingHappening'))
.not.toBe( events('somethingElseHappening'));
});
it('doesn\'t notify a newListener listener of its own addition', function() {
var events = pubSub(),
listenerListener = jasmine.createSpy('listenerListener');
events('newListener').on(listenerListener);
expect(listenerListener).not.toHaveBeenCalled();
});
it('notifies of new listeners when added without an id', function() {
var events = pubSub(),
listenerListener = jasmine.createSpy('listenerListener');
events('newListener').on(listenerListener);
events('foo').on(noop);
expect(listenerListener).toHaveBeenCalledWith('foo', noop, noop);
});
it('should which multiple events notify of the right one', function(){
var events = pubSub(),
listenerA = jasmine.createSpy('listenerA'),
listenerB = jasmine.createSpy('listenerB');
events('eventA').on(listenerA);
events('eventB').on(listenerB);
events('eventA').emit();
expect(listenerA).toHaveBeenCalled();
expect(listenerB).not.toHaveBeenCalled();
events('eventB').emit();
expect(listenerB).toHaveBeenCalled();
});
it('does not fire removeListener if nothing is removed', function() {
var events = pubSub(),
removeListenerListener = jasmine.createSpy('removeListenerListener'),
fooListener = jasmine.createSpy('fooListener');
events('removeListener').on(removeListenerListener);
events('foo').on(fooListener);
events('foo').un('wrong_item');
expect(removeListenerListener).not.toHaveBeenCalled();
});
it('fires removeListener when a listener is removed', function(){
var events = pubSub(),
removeListenerListener = jasmine.createSpy('removeListenerListener');
events('removeListener').on(removeListenerListener);
events('foo').on(noop);
events('foo').un(noop);
expect(removeListenerListener).toHaveBeenCalledWith('foo', noop, noop);
})
describe('short-cut methods', function(){
it('has .emit', function(){
var events = pubSub(),
callback = jasmine.createSpy('something happening callback');
events('somethingHappened').on(callback);
events.emit('somethingHappened', 'it was', 'definitely something');
expect(callback).toHaveBeenCalledWith('it was', 'definitely something');
});
it('has .on', function(){
var events = pubSub(),
callback = jasmine.createSpy('something happening callback');
events.on('somethingHappened', callback);
events('somethingHappened').emit('it was', 'definitely something');
expect(callback).toHaveBeenCalledWith('it was', 'definitely something');
});
it('has .un', function(){
var events = pubSub(),
callback = jasmine.createSpy('something happening callback');
events('somethingHappened').on(callback);
events.un('somethingHappened', callback);
events('somethingHappened').emit('it was', 'definitely something');
expect(callback).not.toHaveBeenCalled();
});
it('has .un that works with listener id', function(){
var events = pubSub(),
callback = jasmine.createSpy('something happening callback');
events('somethingHappened').on(callback, 'id');
events.un('somethingHappened', 'id');
events('somethingHappened').emit('it was', 'definitely something');
expect(callback).not.toHaveBeenCalled();
});
});
}); |