anchor.diff:  --jobs "$(sysctl -n hw.ncpu)"
   ```
   
  -## Syntax and style
  +## The test matrix
  +
  +### Syntax and style
   
   The test suite will run [Puppet Lint](http://puppet-lint.com/) and
   [Puppet Syntax](https://github.com/gds-operations/puppet-syntax) to
  
positive.code: This module has grown over time based on a range of contributions from
  people using it. If you follow these contributing guidelines your patch
  will likely make it into a release a little more quickly.
  
negative.code: bundle exec rake spec SPEC=spec/foo_spec.rb
  ```
  
  #### Unit tests in docker
  
  Some people don't want to run the dependencies locally or don't want to install
  ruby. We ship a Dockerfile that enables you to run all unit tests and linting.
  