Just testing out ideas from this blog post: https://brandur.org/service-stubs

stub_service.rb

require 'webmock'
require 'sinatra/base'
require 'multi_json'
require 'pry'
require 'faraday'

WebMock.disable_net_connect!

class HalSinatra < Sinatra::Base
  configure do
    mime_type :hal, 'application/hal+json'
  end

  before do
    content_type :hal
  end

  after do
    body MultiJson.dump(body) if content_type == 'application/hal+json'
  end
end

class Stub < HalSinatra
  get '/' do
    {
      _links: {
        self: { href: '/' },
      },
    }
  end
end

def stub_service(uri, stub, &block)
  uri = URI.parse(uri)
  port = uri.port != uri.default_port ? ":#{uri.port}" : ""
  stub = block ? Sinatra.new(stub, &block) : stub
  WebMock.stub_request(
    :any,
    %r{^#{uri.scheme}://(.*:.*@)?#{uri.host}#{port}/.*$}
  ).to_rack(stub)
end

uri = "http://example.com"

f = Faraday.new(uri)

stub_service(uri, Stub) do
  get '/d' do
    content_type :html
    "d"
  end
end

f.get('/')  #=> 200, HAL document
f.get('/d') #=> 200, 'd'