async_fn

AsyncFn
=====

Description

This is one-method library, which main purpose is ability to run provided to this method asynchronous functions in a queue one by one.
Please notice, that all provided functions should return a promise and they should be asynchronous. Support for simple functions is not yet implemented, but planned.

$3

Here's just a spec example.

``coffee
it 'calls callbacks in a queue one by one', (done) ->
asyncFn1 = sinon.spy(=>
dfd = new $.Deferred()
setTimeout ->
dfd.resolve()
, 700
dfd.promise()
)

asyncFn2 = sinon.spy(=>
dfd = new $.Deferred()
setTimeout ->
dfd.resolve()
, 300
dfd.promise()
)

asyncFn3 = sinon.spy(=>
dfd = new $.Deferred()
setTimeout ->
dfd.resolve()
, 100
dfd.promise()
)

AsyncFn.addToCallQueue asyncFn1
AsyncFn.addToCallQueue asyncFn2
AsyncFn.addToCallQueue asyncFn3

expect(asyncFn2).to.be.not.called
expect(asyncFn3).to.be.not.called

setTimeout ->
expect(asyncFn1).to.be.calledOnce
expect(asyncFn2).to.be.calledOnce
expect(asyncFn3).to.be.calledOnce
expect(asyncFn1).to.be.calledBefore asyncFn2
expect(asyncFn2).to.be.calledBefore asyncFn3
done()
, 1500
``