如何在ruby的state_machine中存根所有条件方法以进行测试？

Question

I am using state_machine with rails to handle state on some active record models and testing them with rspec and factory girl. I also have a serialized array property called state_path that keeps track of the state history.

class Project < ActiveRecord::Base
  serialize :state_path, Array

  def initialize(*)
    super
    state_path << state_name
  end

  state_machine :state, :initial => :draft do
    after_transition do |project, transition|
      project.state_path << transition.to_name
    end

    event :do_work do
      transition :draft => :complete, :if => :tps_has_cover_page?
    end

    state :draft do
      # ...
    end

    state :complete do
      # ...
    end
  end

  private
    def tps_has_cover_page?
      # ...
    end
end

Now, to test that the after_transition hook is properly populating the state_path property, I stub out the tps_has_cover_page? transition condition method, because I don't care about that functionality in this test, and also it is integrated with other models (tps report model perhaps?)

it "should store the state path" do
  allow_any_instance_of(Project).to receive(:tps_has_cover_page?).and_return(true)

  project = create(:project)
  project.do_work

  expect(project.state_path).to eq([:draft, :complete])
end

However, the transition condition method name could change, or more conditions could be added, which I'm not really concerned with in this test (obviously, since I'm stubbing it).

Question: is there a way to dynamically collect all of the transition condition methods on a state machine? To then be able to build a macro that stubs out all of the condition methods?

Answer 1

尝试：

transition_conditions = state_machine.events.map(&:branches).flatten.flat_map(&:if_condition)