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describe('single event pub sub', function(){
beforeEach(function(){
this.addMatchers({
toBeList: listMatcher
});
});
it('is able to subscribe', function(){
var events = singleEventPubSub('someEventName');
expect(function(){
events.on(function(){});
}).not.toThrow();
});
it('is able to notify a subscribed function without an event object', function(){
var events = singleEventPubSub('someEventName'),
listener = jasmine.createSpy('listener');
events.on(listener);
events.emit();
expect(listener).toHaveBeenCalled();
});
it('is able to notify a subscribed function with a event parameter', function(){
var events = singleEventPubSub('someEventName'),
listener = jasmine.createSpy('listener');
events.on(listener);
events.emit('somethingFunky');
expect(listener).toHaveBeenCalledWith('somethingFunky');
});
it('notifies of new listeners when added without an id', function() {
var newListener = singleEventPubSub('newListener'),
someEventName = singleEventPubSub('someEventName', newListener),
listenerListener = jasmine.createSpy('listenerListener');
newListener.on(listenerListener);
someEventName.on(noop);
expect(listenerListener).toHaveBeenCalledWith('someEventName', noop, noop);
});
it('notifies of new listeners when added with an id', function() {
var newListener = singleEventPubSub('newListener'),
someEventName = singleEventPubSub('someEventName', newListener),
listenerListener = jasmine.createSpy('listenerListener');
newListener.on(listenerListener);
someEventName.on(noop, 'id1');
expect(listenerListener).toHaveBeenCalledWith('someEventName', noop, 'id1');
});
it('notifies multiple listeners of the same event', function(){
var events = singleEventPubSub('someEventName'),
listenerA = jasmine.createSpy('listenerA'),
listenerA2 = jasmine.createSpy('listenerA2');
events.on(listenerA);
events.on(listenerA2);
events.emit();
expect(listenerA).toHaveBeenCalled();
expect(listenerA2).toHaveBeenCalled();
});
it('can pass through multiple parameters', function(){
var events = singleEventPubSub('someEventName'),
listener = jasmine.createSpy('listener');
events.on(listener);
events.emit('a', 'b', 'c');
expect(listener).toHaveBeenCalledWith('a', 'b', 'c');
});
it('can pass multiple parameters to multiple listeners', function(){
var events = singleEventPubSub('someEventName'),
listener = jasmine.createSpy('listener' ),
listener2 = jasmine.createSpy('listener2');
events.on(listener );
events.on(listener2);
events.emit('a', 'b', 'c');
expect(listener ).toHaveBeenCalledWith('a', 'b', 'c');
expect(listener2).toHaveBeenCalledWith('a', 'b', 'c');
});
it('allows many listeners to be registered for an event', function(){
var events = singleEventPubSub('someEventName'),
listenerA = jasmine.createSpy('listenerA');
for (var i = 0; i < 10; i++) {
// listen ten times
events.on(listenerA);
}
for (var j = 0; j < 3; j++) {
// emit 3 times
events.emit();
}
expect(listenerA.calls.length).toBe(30);
});
it('has a chainable on function', function(){
var events = singleEventPubSub('someEventName'),
listenerA = jasmine.createSpy('listenerA'),
listenerB = jasmine.createSpy('listenerB');
events.on(listenerA)
.on(listenerB)
.emit();
expect(listenerA).toHaveBeenCalled();
expect(listenerB).toHaveBeenCalled();
});
it('allows an event to be removed', function(){
var events = singleEventPubSub('someEventName'),
listener1 = jasmine.createSpy('listener1'),
listener2 = jasmine.createSpy('listener2');
events.on(listener1);
events.on(listener2);
events.emit();
expect(listener1.calls.length).toBe(1);
events.un(listener1);
events.emit();
expect(listener1.calls.length).toBe(1);
expect(listener2.calls.length).toBe(2);
});
it('allows an event to be removed by an id', function(){
var events = singleEventPubSub('someEventName'),
listener1 = jasmine.createSpy('listener1'),
listener2 = jasmine.createSpy('listener2');
events.on(listener1, 'FOO_ID');
events.on(listener2, 'BAR_ID');
events.emit();
expect(listener1.calls.length).toBe(1);
events.un('FOO_ID');
events.emit();
expect(listener1.calls.length).toBe(1);
expect(listener2.calls.length).toBe(2);
events.un('BAR_ID');
events.emit();
expect(listener2.calls.length).toBe(2);
})
it('does not fire removeListener if nothing is removed', function() {
var newListener = singleEventPubSub('newListener'),
removeListener = singleEventPubSub('removeListener'),
events = singleEventPubSub('someEventName', newListener, removeListener),
removeListenerListener = jasmine.createSpy('removeListenerListener'),
fooListener = jasmine.createSpy('fooListener');
removeListener.on(removeListenerListener);
events.on(fooListener);
events.un('wrong_item');
expect(removeListenerListener).not.toHaveBeenCalled();
});
it('fires removeListener when a listener is removed', function(){
var newListener = singleEventPubSub('newListener'),
removeListener = singleEventPubSub('removeListener'),
events = singleEventPubSub('someEventName', newListener, removeListener),
removeListenerListener = jasmine.createSpy('removeListenerListener'),
fooListener = jasmine.createSpy('fooListener');
removeListener.on(removeListenerListener);
events.on(fooListener);
events.un(fooListener);
expect(removeListenerListener).toHaveBeenCalled();
})
it('does not crash if asked to emit without listeners', function(){
var events = singleEventPubSub('someEventName');
expect(function(){
events.emit('unknown event');
}).not.toThrow();
});
describe('listeners method', function(){
it('can return listeners when there haven\'t been any', function(){
var events = singleEventPubSub('someEventName');
expect( events.listeners('testEventType') ).toBeFalsy();
})
it('can return listeners when one has been added', function(){
var events = singleEventPubSub('someEventName');
events.on(noop);
expect( events.listeners('testEventType') ).toBeList(list(noop));
})
it('can return listeners when second is added', function(){
var events = singleEventPubSub('someEventName');
events.on(noop);
events.on(noop);
expect( events.listeners('testEventType') ).toBeList(list(noop, noop));
})
it('can return listeners when one is removed', function(){
var events = singleEventPubSub('someEventName');
events.on(noop);
events.on(noop);
events.un(noop);
expect( events.listeners('testEventType') ).toBeList(list(noop));
})
it('can return listeners when all are removed', function(){
var events = singleEventPubSub('someEventName');
events.on(noop);
events.on(noop);
events.un(noop);
events.un(noop);
expect( events.listeners('testEventType') ).toBeFalsy();
})
})
}); |