thiagoa

RSpec.shared_examples_for "interface checker" do
  def diff_for(array_1, array_2)
    (array_1 - array_2) + (array_2 - array_1)
  end

  def arities_for(object)
    object.public_methods.map do |m|
      arity = object.method(m).arity
      [m, arity == -1 ? anything : arity]
    end

thiagoa

RSpec.shared_examples_for "check interface against canonical" do |canonical_interface, classes_to_check|
  classes_to_check.each do |class_to_check|
    example "#{class_to_check} conforms to the required interface", :aggregate_failures do
      interface_methods = canonical_interface.public_instance_methods(false)

      methods_to_check = class_to_check.public_instance_methods(false)
      diff = interface_methods - methods_to_check

      expect(diff).to be_empty, (<<~MESSAGE).split("\n").join(" ")
        Expected #{class_to_check} to be polymorphic with

smmr0

[user]
	name = …
	email = …
	signingkey =