Day 4 in the #vDM30in30 One of the things that comes up a lot with Puppet code is testing, particularly acceptance testing. Just like with regular code, you want to make sure that changes to Puppet are not going to break the standard use-case for your module. Travis has been a boon for open-source testing. For a while, Travis was only for the syntax, linting and rspec tests. But in the last year they’ve added the ability to have Docker running in a Travis job.