shared_examples "State Machine updateable event (concerns)" do
  unless described_class.method_defined? :blah
    described_class.class_eval do
      state_machine :state, initial: :pending do
        state :pending, :blahhed

        event :blah do
          transition any => :blahhed
        end
      end
    end
  end

  subject { described_class.new }
  it { should respond_to :event= }

  describe "#event=" do
    it "should not trigger non-existing state machine event" do
      subject.should_receive(:blah!)
      subject.event = :blah
      subject.blahhed?
    end

    it "should trigger state machine event" do
      subject.should_not_receive(:noblah!)
      subject.event = :noblah
    end
  end
end