Using pact for Capybara tests and unit tests

idea.rb

class InternalProviderClient
  def thing
    #get a thing from the internal provider
  end
end

# pact_helper

Pact.configure do | config |
  config.pactfile_write_mode = :update
end

Pact.consumer "My Rails App" do
  has_pact_with "Internal Provider" do
    mock_service :internal_provider do
      port 1234
    end
  end
end

module PactExpectations

  #or maybe extend, try and see
  #may not need to do this actually, because the builders will be included in the rspec scope where
  #these methods will be called.
  include Pact::Consumer::ConsumerContractBuilders

  def stub_some_request_with_success_response
    internal_provider.
      given("something exists").
      upon_recieving("some request").
      with(...).
      will_respond_with(...)
  end

  def stub_some_request_with_error_response
    internal_provider.
      given("an error occurs retrieving something").
      upon_recieving("some request").
      with(...).
      will_respond_with(...)
  end

end


# provider spec

require './spec/service_providers/pact_helper'

describe InternalProviderClient, :pact => true do
  
  include PactExpectations


  describe "thing" do
    context "when successful" do
      before do
        stub_some_request_with_some_response
      end
      it "returns a thing" do
        expect(InternalProviderClient.new.thing).to be_a_thing
      end
    end

    context "when an error occurs retrieving the thing" do
      before do
        stub_some_request_with_error_response
      end
      it "raises an error" do
        expect{ InternalProviderClient.new.thing}.to raise_error /No thing!!/
      end
    end
  end

end

# capybara spec

require './spec/service_providers/pact_helper'

#Are you using Cucumber or RSpec???

describe "using the UI", :pact => true do

  include PactExpectations

  before do
    stub_some_request_with_some_response
  end

  it "does something when I click" do
    #click stuff
  end

end