Testing meteor js/mocha with wercker pipeline hangs

1

I’ve got an app I can test locally without issue using

meteor test-packages --velocity
// result
[[[[[ Tests ]]]]]                             

=> Started proxy.                             
=> Started MongoDB.                           
=> Started your app.                          

=> App running at: http://localhost:3000/
PASSED mocha : sanjo:jasmine on server => works
TESTS RAN SUCCESSFULLY

Each package.js in the app I’m testing has the following :

Package.onTest(function(api) {
  api.use(['mike:mocha-package@0.5.8']);

  api.addFiles('tests/server/example.js', 'server');
});

Now I’m trying to do the same via the Wercker pipeline using the following wercker.yml :

build :
    box: ubuntu
    steps :

    # have to install meteor to run the tests
    - script :
        name : meteor install
        code : |
            sudo apt-get update -y
            sudo apt-get -y install curl wget
            cd /tmp
            wget https://phantomjs.googlecode.com/files/phantomjs-1.9.1-linux-x86_64.tar.bz2
            tar xfj phantomjs-1.9.1-linux-x86_64.tar.bz2
            sudo cp /tmp/phantomjs-1.9.1-linux-x86_64/bin/phantomjs /usr/local/bin
            curl https://install.meteor.com | /bin/sh

    # run tests using meteor test cli
    - script :
        name : meteor test
        code : |
            meteor test-packages --velocity --settings config/settings.json

The meteor install step works fine but then the pipeline just hangs here :

[[[[[ Tests ]]]]]                             

=> Started proxy.                             
=> Started MongoDB.                           
=> Started your app.                          

=> App running at: http://localhost:3000/

Any ideas ? Am I not installing phantomjs correctly ?