hartmantis

...
let(:object) { Testing::Test.new }
let(:run_command) { stub(:stdout => 'Some string') }
let(:shellout) { stub(:run_command => run_command) }

it 'shells out' do
  Mixlib::ShellOut.stub(:new).and_return(shellout)
  expect(object.shellout).to eq('Some string')
end
...

hartmantis

require 'chefspec'

module SpecHelper
  def global_stubs
    # Don't worry about external cookbook dependencies
    Chef::Cookbook::Metadata.any_instance.stub(:depends)

    # Test each recipe in isolation, regardless of includes
    @included_recipes = []
    Chef::RunContext.any_instance.stub(:loaded_recipe?).and_return(false)