casperjs test written in coffeescript hangs

recently I tried to use CoffeeScript for CasperJS tests. So this code below doesn't throw any error, and seems to hang every time I fire it up in CLI.

casper = require("casper")
  .create
      verbose: true,
      logLevel: "debug"

casper_utils = require("utils")
colorizer = require("colorizer").create 'Colorizer'

common_link = "http://0.0.0.0:6543/"

landing_pages = ['g',
            'em',
            'm1',
            'm4',
            'mv4',
            'mv5',
            'mp',
            'm2',
            'm3',
            'rp',
            'rc']

reg_hash = '#reg'
reg_modal = '.registration'

pay_hash = '#pay'
pay_modal = '.payment'

checkRegVisibility = ->
  @test.assertExists reg_modal
  @test.assertVisible reg_modal
  @test.assertNotVisible pay_modal

checkPayVisibility = ->
  @test.assertExists pay_modal
  @test.assertVisible pay_modal
  @test.assertNotVisible reg_modal

casper.on 'run.start', ->
  @.log 'Casper started'

casper.on 'error', ->
  @.log 'error'

casper.on 'http.status.404', ->
  @.log '404'

casper.test.begin = ('Initial test', landing_pages.length * 3, suite(test)) ->
  landing_pages.forEach (lp, index) ->
    casper.start common_link+"?lp="+lp, ->
        casper.echo lp
        checkRegVisibility()
    casper.then common_link+"?lp="+lp+reg_hash, ->
        casper.echo lp
        checkRegVisibility()
    casper.run, ->
        test.done()

casper.exit()

Also, is that possible to use JS2Coffee with casperjs tests