allow to import filters from another interaction into a hash

[formigarafa]

This allows composition scenarios like the example bellow:

class UserSignUp < ActiveInteraction::Base
  string :email
  string :password
  string :name, default: nil
end

class CreatePost < ActiveInteraction::Base
  object user,
  string :title
  string :body
end

class SignUpAndCreatePost < ActiveInteraction::Base
  hash :user do
    import_filters UserSignUp
  end

  hash :post do
    import_filters CreatePost, except: :user
  end

  def execute
    new_user = compose(UserSignUp, **user.to_options)
    compose(CreatePost, user: new_user, **post.to_options)
  end
end


SignUpAndCreatePost.run!(
  user: {email: "[email protected]", password: "secret"}, 
  post: {title: "The News", body: "import_filters from a has is a thing"},
)

So far, so good. But I am having a bit of a hard time trying to figure how to write (proper not overly verbose) tests for this.