It has been clear for years that there is a strong need to be able to test how changes to our Puppet code can affect our infrastructure.
The topic is quite large and, to be honest, not completely solved, but there are tools and methods than can help us to work safely with Puppet in a production environment.
We can test our code with the following tools:
puppet parser validateto check the syntax of our manifests
puppet-lintto check the style of our code
We can also follow some procedures and techniques, such as: