Allan Espinosa

Really unit testing Chef recipes

2014 June 29

Chefspec

  • Simple to get started
  • Build the resource collection
  • Monkeypatch a provider’s :perform_action method to do nothing.
  • More complete
  • A lot of monkey patching on assertions

Unit testing recipes

  • You want to assert the resource collection after compiling the recipe. Borrowed from the description of rspec-puppet.
  • if else logic
  • Need to stub the whole chef
  • run_context
  • node object

Test according to the Chef run cycle. An overview from http://docs.opscode.com/essentials_nodes_chef_run.html. Actual code is in https://github.com/opscode/chef/blob/master/lib/chef/run_context/cookbook_compiler.rb#L70-L76.

Fake that in the run context. So do that in the unit test as well to stub the run_context

Advantages

  • Fast tests
  • really isolated recipes
  • understanding of chef’s innards

Disadvantages

  • too much to stub
  • Reflects on the design of chef?
  • Are the tests here telling us something?