Stubbing LWRP in chefspec

lwrp_spec.rb

# Very contrived example, but...
# Given an LWRP called my_lwrp that looks something like:

action :create do
  file '/tmp/foo' do
    content custom_content
  end
end

def custom_content
  "Some content"
end

# Lets say you need to change the return value of custom_content in ChefSpec for some test:

ChefSpec::Runner.new().converge('recipe_name') do
  Chef::Provider::MyLwrp.any_instance.stub(custom_content: "Test content")
end