forwarder/spec/Forwarder_spec.coffee

Forwarding of messages to different objects (mostly properties of the receiver)

{ expect } = require "chai"
{ forward } = require "../src/forwarder"

describe "forwarder", ->
  obj =
    name: "no name so far"
    fun: ->
      a: 42

  it "forwards", ->
    forward obj, 'split', to: 'name'
    expect( obj.split ' ' ).to.deep.equal ['no', 'name', 'so', 'far']

  it "forwards with translations", ->
    forward obj, 'seperate', to: 'name', as: 'split'
    expect( obj.seperate ' ' ).to.deep.equal ['no', 'name', 'so', 'far']

  it "raises an error for unforwarded messages", ->
    expect( 
      -> obj.undefinedMethod()
    ).to.throw TypeError

  it "raises an error if to: is missing", ->
    expect(
      ->
        forward obj, 'whatever', as: 'other'
    ).to.throw TypeError, "missing keyword arg to:"

  it "sets arguments", ->
    forward obj, 'splitByOes', to: 'name', as: 'split', with: ['o']
    expect(
      obj.splitByOes()
    ).to.deep.equal ['n', ' name s', ' far']