default.rb

my_test "foo" do
  action :create
end

my_provider.rb

class Chef
  class Provider
    class MyTest < Chef::Provider
      def load_current_resource
        @current_resource ||= Chef::Resource::MyTest.new("foo")
      end

      def action_create
        d = directory "foo"
        d.run_action(:create)
      end
    end
  end
end

my_resource.rb

class Chef
  class Resource
    class MyTest < Chef::Resource

      def initialize(name, run_context=nil)
        super
        @action = :create
        @allowed_actions << :create
        @provider = Chef::Provider::MyTest
      end
    end
  end
end