Right Situation

class Emitter

    completed: null

    constructor: ->
        console.log "completed", @completed
        @completed = new signals.Signal()

        setTimeout =>
            @completed.dispatch( "something" )
        , 3000

class Test1
    constructor: ->
        emitter = new Emitter()
        emitter.completed.add (data) =>
            console.log "Test1 received", data

class Test2
    constructor: ->
        emitter = new Emitter()
        emitter.completed.add (data) =>
            console.log "Test2 received", data

test1 = new Test1()
test2 = new Test2()

########### The console output will be: ##########
# listener (should be null) null
# listener (should be null) null
# Test1 received something
# Test2 received something
######## THIS IS WHAT WE EXPECT #############