title: Resize Chrome's window while using Capybara
body: <p>I use Capybara (with selenium) and Chrome, and RSpec. But i would like to change width of browser in some tests. What is the solution in this case?</p>
  
  <p><strong>spec/spec_helper.rb</strong></p>
  
  <pre><code>ENV["RAILS_ENV"] ||= 'test'
  require File.expand_path("../../config/environment", __FILE__)
  require 'rspec/rails'
  require 'rspec/autorun'
  require 'capybara/rspec'
  
  # Requires supporting ruby files with custom matchers and macros, etc,
  # in spec/support/ and its subdirectories.
  Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}
  
  # Using chrome as browser to test in capybara.
  Capybara.register_driver :selenium do |app|
    Capybara::Selenium::Driver.new(app, :browser =&gt; :chrome)
  end
  
  # RSpec config.
  RSpec.configure do |config|
    config.include Devise::TestHelpers, :type =&gt; :controller    
    # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
    config.fixture_path = "#{::Rails.root}/spec/fixtures"
  
    # If you're not using ActiveRecord, or you'd prefer not to run each of your
    # examples within a transaction, remove the following line or assign false
    # instead of true.
    config.use_transactional_fixtures = false
  
    # If true, the base class of anonymous controllers will be inferred
    # automatically. This will be the default behavior in future versions of
    # rspec-rails.
    config.infer_base_class_for_anonymous_controllers = false
  
    # Clean test database.
    config.before(:suite) do
      DatabaseCleaner.strategy = :truncation
    end
  
    config.before(:each) do
      DatabaseCleaner.start
    end
  
    config.after(:each) do
      DatabaseCleaner.clean
    end
  end
  </code></pre>