RSpec::Rails, Capybara, Rack::Test errors on last_response

api_helper.rb

# ./spec/support/api/helper.rb
module ApiHelper
  include Rack::Test::Methods

  def app
    Rails.application
  end
end

RSpec.configure do |c|
  c.include ApiHelper, :type => :api
end

api_helper_v2.rb

module ApiHelper
  def self.included(base)
    base.__send__(:include, Rack::Test::Methods)
  end

  def app
    Rails.application
  end
end

RSpec.configure do |c|
  c.include ApiHelper, :type => :api
end

backtrace.log

Failures:

  1) /api/v0/projects list of projects returns a JSON array of projects scoped by this user
     Failure/Error: expect(last_response.status).to eq(200)
     NameError:
       undefined local variable or method `last_response' for #<RSpec::Core::ExampleGroup::Nested_1::Nested_1:0xd219348>
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-expectations-2.12.0/lib/rspec/matchers/method_missing.rb:9:in `method_missing'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/actionpack-3.2.9/lib/action_dispatch/testing/assertions/routing.rb:176:in `method_missing'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/actionpack-3.2.9/lib/action_dispatch/testing/integration.rb:386:in `method_missing'
     # ./spec/apis/v0/projects_spec.rb:19:in `block (3 levels) in <top (required)>'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example.rb:114:in `instance_eval'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example.rb:114:in `block in run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example.rb:254:in `with_around_each_hooks'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example.rb:111:in `run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example_group.rb:388:in `block in run_examples'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example_group.rb:384:in `map'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example_group.rb:384:in `run_examples'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example_group.rb:369:in `run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example_group.rb:370:in `block in run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example_group.rb:370:in `map'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/example_group.rb:370:in `run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/command_line.rb:28:in `block (2 levels) in run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/command_line.rb:28:in `map'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/command_line.rb:28:in `block in run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/reporter.rb:34:in `report'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/command_line.rb:25:in `run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/runner.rb:66:in `rescue in run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/runner.rb:62:in `run'
     # /home/adrian/.rvm/gems/ruby-1.9.3-p286-perf@searchfuse/gems/rspec-core-2.12.0/lib/rspec/core/runner.rb:8:in `block in autorun'

projects_spec.rb

# ./spec/apis/v0/projects_spec.rb
require 'spec_helper'

describe "/api/v0/projects", :type => :api do
  let(:user)  { create_user! }
  let(:token) { user.authentication_token }

  before do
    @project = FactoryGirl.create(:project, :name => 'FirstProj')
    user.account.projects << @project
    user.account.save!
  end

  context "list of projects" do
    let(:url) { "/api/v0/projects" }

    it "returns a JSON array of projects scoped by this user" do
      projects_json = user.projects.to_json
      get "#{url}.json", :api_token => token
      expect(last_response.status).to eq(200)

      projects = JSON.parse(last_response.body)['projects']

      projects.any? { |p| p['name'] == 'FirstProj' }.should be
    end
  end
end

This is the simplest case, as the test is mostly a stub/safety, but it evidences the problem, I know I might just use response instead of last_response instead, but wanted to know why last_response won't work since rack-test 0.6.2 (latest), properly defines that in Rack::Test::Methods.

Same thing for me, no last_response, but response works OK. Have you found the solution?

2019 - still a problem - even if using 'response' in my case. Is there no generator which can set up all the boilerplate so it "just works"?? I'd like to spend time writing-tests, not hours trying to get the test-framework to function.