Protractor test issue

Build Environment
1

Below is the circle.yml file am using.Anyone know how to run protractor test in circleCI

dependencies:
pre:
- nvm install v4.3.2
- nvm alias default 4.3.2
- npm install -g bower
- bower install
- npm install
- nvm ls
- npm install -g protractor
- npm install -g cucumber
- npm install -g protractor-cucumber-framework
- npm install selenium-standalone@latest -g
- selenium-standalone install
machine:
environment:
Http_Proxy (deleted)

test:

 override:
   - npm test
   - nvm use v6 && npm run protractor