.gitignore

.bundle/bin/
vendor

config

BUNDLE_BIN: .bundle/bin
BUNDLE_SHEBANG: ruby-local-exec
BUNDLE_DISABLE_SHARED_GEMS: '1'
BUNDLE_PATH: vendor

fakefs_persister.rb

require 'fileutils'

module Cio
  class Bdd
    # The only built-in cassette persister. Persists cassettes to the file system.
    class FakeFSFileSystem
        #extend self

        # @private
        attr_reader :storage_location

        def initialize(dir)
          @storage_location=dir
        end

        # @private
        def storage_location=(dir)
          puts 'is this called?'
          ::FakeFS.deactivate! if ::FakeFS.activated?
          ::FileUtils.mkdir_p(dir) if dir
          @storage_location = dir ? absolute_path_for(dir) : nil
          ::FakeFS.activate!
          @storage_location
        end

        # Gets the cassette for the given storage key (file name).
        #
        # @param [String] file_name the file name
        # @return [String] the cassette content
        def [](file_name)
          ::FakeFS.deactivate! if ::FakeFS.activated?
          path = absolute_path_to_file(file_name)
          return nil unless ::File.exist?(path)
          result = ::File.read(path)
          ::FakeFS.activate!
          result
        end

        # Sets the cassette for the given storage key (file name).
        #
        # @param [String] file_name the file name
        # @param [String] content the content to store
        def []=(file_name, content)
          ::FakeFS.deactivate! if ::FakeFS.activated?
          path = absolute_path_to_file(file_name)
          directory = File.dirname(path)
          FileUtils.mkdir_p(directory) unless File.exist?(directory)
          result = File.open(path, 'w') { |f| f.write(content) }
          ::FakeFS.activate!
          result
        end

        # @private
        def absolute_path_to_file(file_name)
          ::FakeFS.deactivate! if ::FakeFS.activated?
          return nil unless storage_location
          result = ::File.join(storage_location, sanitized_file_name_from(file_name))
          ::FakeFS.activate!
          result
        end

        private

        def absolute_path_for(path)
          ::FakeFS.deactivate! if ::FakeFS.activated?
          result = ::Dir.chdir(path) { ::Dir.pwd }
          ::FakeFS.activate!
          result
        end

        def sanitized_file_name_from(file_name)
          ::FakeFS.deactivate! if ::FakeFS.activated?
          parts = file_name.to_s.split('.')
          file_extension = '.' + parts.pop if parts.size > 1
          result = parts.join('.').gsub(/[^\w\-\/]+/, '_') + file_extension.to_s
          ::FakeFS.activate!
          result
        end
    end
  end
end

fakefs_vcr_spec.rb

require 'spec_helper'

def make_http_request(url)
  ::Typhoeus.get(url).body
end

def here(fname)
  RealFile.expand_path(File.join(RealFile.dirname(__FILE__), fname))
end

describe "VCR example group metadata",:vcr, :type => :fakefs do
  let(:url){'http://google.com.au/index.html'}
  it 'records an http request' do
    make_http_request(url).should match /The document has moved/
  end

  it 'records another http request' do
    make_http_request(url).should match /The document has moved/
  end

  context 'in a nested example group' do
    it 'records another one' do
      make_http_request(url).should match /The document has moved/
    end
  end
end

describe "VCR example metadata" do
  let(:url){'http://google.com/index.html'}
  it 'records an http request', :vcr do
    make_http_request(url).should match /The document has moved/
  end
end

Gemfile

# A sample Gemfile
source "http://rubygems.org"

gem 'vcr'
gem 'fakefs'
gem 'typhoeus'
gem 'fakeweb'
gem 'rspec'
gem 'rr'

Gemfile.lock

GEM
  remote: http://rubygems.org/
  specs:
    diff-lcs (1.1.3)
    ethon (0.5.7)
      ffi (~> 1.2.0)
      mime-types (~> 1.18)
    fakefs (0.4.2)
    fakeweb (1.3.0)
    ffi (1.2.0)
    mime-types (1.19)
    rr (1.0.4)
    rspec (2.12.0)
      rspec-core (~> 2.12.0)
      rspec-expectations (~> 2.12.0)
      rspec-mocks (~> 2.12.0)
    rspec-core (2.12.1)
    rspec-expectations (2.12.0)
      diff-lcs (~> 1.1.3)
    rspec-mocks (2.12.0)
    typhoeus (0.5.3)
      ethon (~> 0.5.3)
    vcr (2.3.0)

PLATFORMS
  ruby

DEPENDENCIES
  fakefs
  fakeweb
  rr
  rspec
  typhoeus
  vcr

output.log

Configuring VCR in Rspec
Configuring VCR in Rspec for FakeFS
DONE Configuring VCR in Rspec for FakeFS
Run options: include {:focus=>true}

All examples were filtered out; ignoring {:focus=>true}
  Loaded fakefs/spec_helpers
....

Finished in 1.08 seconds
4 examples, 0 failures

spec_helper.rb

require 'fakefs_persister'

Dir['./spec/support/**/*.rb'].sort.each{|f| require f }

module ::FakeFSTrigger
  def self.included(base)
    RSpec.configure do |config|
      config.before(:suite) do
        require 'fakefs/spec_helpers'
        config.include ::FakeFS::SpecHelpers
        ::FakeFS.activate!
        puts '  Loaded fakefs/spec_helpers'
      end
      config.after(:suite) do
        ::FakeFS::FileSystem.clear
        ::FakeFS.deactivate!
      end
    end
    VCR.configure do |c|
      begin
        require 'fakefs/spec_helpers'
        puts 'Configuring VCR in Rspec for FakeFS'
        c.allow_http_connections_when_no_cassette = true
        c.cassette_library_dir = 'bdd/cassettes'
        c.cassette_persisters[:fakefs_present] = ::Cio::Bdd::FakeFSFileSystem.new('bdd/cassettes')
        c.default_cassette_options = { :persist_with => :fakefs_present}
        c.hook_into :fakeweb, :typhoeus
        c.ignore_localhost = true
        c.default_cassette_options = { :record => :new_episodes }
        puts 'DONE Configuring VCR in Rspec for FakeFS'
      rescue => e
        puts e.message
        puts e.backtrace.join '\n'

      end
    end
  end
end

RSpec.configure do |c|
  # See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
  c.mock_with :rr #::RR::Adapters::Rspec
  c.backtrace_clean_patterns.push(::RR::Errors::BACKTRACE_IDENTIFIER)
  c.treat_symbols_as_metadata_keys_with_true_values = true
  c.run_all_when_everything_filtered = true
  c.filter_run :focus
  c.alias_it_should_behave_like_to :it_validates, "it validates"
  c.include ::FakeFSTrigger, :type => :fakefs
end

vcr.rb

require 'fakeweb'
require 'typhoeus'
require 'vcr'

::VCR.configure do |c|
  puts 'Configuring VCR in Rspec'
  c.allow_http_connections_when_no_cassette = true
  c.cassette_library_dir = 'bdd/cassettes'
  c.hook_into :fakeweb, :typhoeus
  c.configure_rspec_metadata!
  c.ignore_localhost = true
  c.default_cassette_options = { :record => :new_episodes }
end