#291 Testing with VCR pro

Oct 17, 2011 | 13 minutes | Testing, Plugins

If you ever need to test an application which communicates with an external API, VCR is the way to go. Here I show a workflow in RSpec, how to use with capybara-mechanize, how to add sanitization filtering, and more.

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          Gemfile
        
group :test do
  # ...
  gem 'vcr'
  gem 'fakeweb'
  gem 'capybara-mechanize'
end

          spec/requests/zip_code_lookup_spec.rb
        
describe "ZipCodeLookup" do
  it "show Beverly Hills given 90210", :vcr do
    visit root_path
    fill_in "zip_code", with: "90210"
    click_on "Lookup"
    page.should have_content("Beverly Hills")
  end
  
  it "searches RailsCasts", :vcr do
    Capybara.current_driver = :mechanize
    visit "http://railscasts.com"
    fill_in "search", with: "how I test"
    click_on "Search Episodes"
    page.should have_content('#275')
  end
end

          spec/support/vcr.rb
        
VCR.config do |c|
  c.cassette_library_dir = Rails.root.join("spec", "vcr")
  c.stub_with :fakeweb
  c.filter_sensitive_data('<WSDL>') { "http://www.webservicex.net:80/uszip.asmx?WSDL" }
end

RSpec.configure do |c|
  c.treat_symbols_as_metadata_keys_with_true_values = true
  c.around(:each, :vcr) do |example|
    name = example.metadata[:full_description].split(/\s+/, 2).join("/").underscore.gsub(/[^\w\/]+/, "_")
    options = example.metadata.slice(:record, :match_requests_on).except(:example_group)
    VCR.use_cassette(name, options) { example.call }
  end
end

          spec_helper.rb
        
require 'capybara/mechanize'

HTTPI.log = false
Savon.log = false