Bundler fun

app.rb

require 'sinatra'

module Example
  class App < Sinatra::Base
  end
  
  def self.app
    @app ||= Rack::Builder.new do
      run App
    end
  end
end

example_spec.rb

require File.dirname(__FILE__) + '/spec_helper'

describe "Something cool" do
  it "Should be able to load adressable" do
    response = get "/"
    uri = Addressable::URI.parse(response.headers["Location"])

  end
end

Gemfile

source "http://rubygems.org"

gem 'ruby-debug19',     :platforms => :ruby_19
gem 'ruby-debug',       :platforms => :ruby_18

# Specify your gem's dependencies in warden-podio.gemspec
gemspec

gemname.gemspec

# -*- encoding: utf-8 -*-
$:.push File.expand_path("../lib", __FILE__)

Gem::Specification.new do |s|
  # specify any dependencies here; for example:
  s.add_development_dependency "rack"
  s.add_development_dependency "rake"
  s.add_development_dependency "rspec",       "~>2.8.0"
  s.add_development_dependency "sinatra"
  s.add_development_dependency "addressable", "~>2.2.0"
  s.add_development_dependency "rack-test",   "~>0.5.3"
  # s.add_runtime_dependency "rest-client"
  
  s.files         = `git ls-files`.split("\n")
  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
  s.require_paths = ["lib"]
end

gistfile1.txt

Failure/Error: uri = Addressable::URI.parse(response.headers["Location"])
     NameError:
       uninitialized constant RSpec::Core::ExampleGroup::Nested_1::Addressable
     # ./spec/example_spec.rb:8:in `block (2 levels) in <top (required)>'

spec_helper.rb

Bundler.require(:default, :runtime, :test, :development) # useless

require File.join(File.dirname(__FILE__), '..', 'lib', 'gemname')
require File.join(File.dirname(__FILE__), 'app')
require 'rack/test'
require "addressable/uri" # < fix

RSpec.configure do |config|
  config.include(Rack::Test::Methods)

  def app
    Example.app
  end
end