How to enable javascript in request(integration) test using rspec and capybara webkit. Also covered issue with database transaction.

example_spec_with_javascript_enalbed.rb

# in your view erb file
<%= link_to_function "test js", '$(this).html("js works")' %>

# in test spec
it "supports js", :js => true do
  visit tasks_path
  click_link "test js"
  page.should have_content("js works")
end

install_capybara_webkit.rb

# webkit-dependency
# if you don't have homebrew installed
/usr/bin/ruby -e "$(curl -fsSL https://raw.github.com/gist/323731)"
# if you don't have QT installed
brew install qt

# Gemfile, add capybara-webkit
group :test, :development do
  ...
  gem "capybara-webkit"
end

# in Terminal
bundle install

# set default capybara driver to webkit.
# I put this into spec_helper.rb
Capybara.javascript_driver = :webkit

# In RSpec, use the :js => true flag
it "supports js", :js => true do
  ...
end

js_test_combined_with_database.rb

it "displays tasks", :js => true do
  Task.create!(:name => "foo")
  visit tasks_path
  click_link 'some link'
  page.should have_content("some text")
end

use_database_cleaner_gem.rb

# in Gemfiile
group :test, :development do
  ...
  gem "database_cleaner"
end

# in Terminal
bundle install

# in spec_helper.rb
RSpec.configure do |config|
  # ...
  config.use_transactional_fixtures = false
  
  config.before(:suite) do
    DatabaseCleaner.strategy = :truncation
  end

  config.before(:each) do
    DatabaseCleaner.start
  end

  config.after(:each) do
    DatabaseCleaner.clean
  end
end

See http://devblog.avdi.org/2012/08/31/configuring-database_cleaner-with-rails-rspec-capybara-and-selenium/ for how to use speedier transactional fixtures, when possible.