circle.yml

test:
 override:
   - ./node_modules/.bin/gulp ci

codeclimate-exclude.txt

Exclude patterns:
 js/lib/*
 specs/lib/*

gulpfile.coffee

gulp.task("ci", ['build', 'test'])

karma.coffee

module.exports = (gulp, cfg, env) ->
  karma = require('karma').server
  gulp.task 'karma', (done) ->
    karma.start
      configFile: cfg.karmaConfig
      singleRun: true
    , done

updated-circle.yml

test:
 override:
   - ./node_modules/.bin/gulp ci
   - CODECLIMATE_REPO_TOKEN=$CodeClimateToken ./node_modules/.bin/codeclimate < reports/coverage/lcov.info

updated-gruntfile.coffee

gulp.task("ci", ['build', 'karma'])