Nodejs

image: node:6.0.0

pipelines:
  default:
    - step:
        script:
          - npm install --silent --progress=false
          - npm test

Meu bloco scripts do package.json:

...
"scripts": {
  "start": "node app.js",
  "test": "mocha test/**/*Test.js",
  "coverage": "istanbul cover _mocha -- -R spec"
},
...