machine:
  node:
    version: 6.9.2
test:
  override:
    - mkdir -p $CIRCLE_TEST_REPORTS/lab
    - npm run test -- --output $CIRCLE_TEST_REPORTS/junit/test-results.xml --reporter junit

machine:
  node:
    version: 8.1.0
test:
  override:
    - mkdir -p $CIRCLE_TEST_REPORTS/lab
    - npm run test -- --output $CIRCLE_TEST_REPORTS/junit/test-results.xml --reporter junit

Use Node.js 8.1.0 for testing
Use Node.js 8.1.0 for testing
