capybara_cheat_sheet.rb

#=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

#=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click_on('Button Value')
    find('form.foo .btn').click

#=Interacting with forms=
    fill_in('First Name', :with => 'John')
    fill_in('Password', :with => 'Seekrit')
    fill_in('Description', :with => 'Really Long Text…')
    choose('A Radio Button')
    choose("radio_group_selector"), option: "Option 5"
    check('A Checkbox')
    uncheck('A Checkbox')
    attach_file('Image', '/path/to/image.jpg')
    select('Option', :from => 'Select Box')
    unselect('Option', from: select_box)
    find("#select_id").select("value")

#=scoping=
    within(:xpath, "//li[@id='employee']") do
      fill_in 'Name', :with => 'Jimmy'
    end
    within("li#employee") do
      fill_in 'Name', :with => 'Jimmy'
    end
    within_fieldset('Employee') do
      fill_in 'Name', :with => 'Jimmy'
    end
    within_table('Employee') do
      fill_in 'Name', :with => 'Jimmy'
    end

#=Querying=
    page.has_xpath?('//table/tr')
    page.has_css?('table tr.foo')
    page.has_content?('foo')
    page.should have_xpath('//table/tr')
    page.should have_css('table tr.foo')
    page.should have_content('foo')
    page.should have_no_content('foo')
    expect(page).to have_selector 'foobar'
    find_field('First Name').value
    find_link('Hello').visible? #false, finds only visible
    find_button('Send').click
    find('//table/tr').click
    all('a').each { |a| a[:href] }

#=Find actions=
    find("input.file").attach_file  
    find("input.checkbox").check  
    find("input.select").choose  
    find(".button").click_button  
    find(".link").click_link  
    find(".link").click_link_or_button  
    find(".link").click_on  
    find(".link").click 
    find("input.text").set('Jimmy') #instead of fill_in
    find("input.select").select  
    find("input.checkbox").uncheck  
    find("input.select").unselect
    find("input.select").unselect_option(option: "Option 5")
    find("input.checkbox").checked?  
    find(".button").disabled? 
    find(".link").hover    
    find("input.select").selected? 
    find("input.text").value   
    find(".text").text        
    find(".link").visible?
  
#=Scripting=
    result = page.evaluate_script('4 + 4')
    periods = page.evaluate_script("$('#MainContent_dd').map(function() { return $(this).text() }).get()")

#=Debugging=
    save_and_open_page
    screenshot_and_open_image # with the capybara-screenshot gem

#=Asynchronous JavaScript=
    click_link('foo')
    click_link('bar')
    page.should have_content('baz')
    page.should_not have_xpath('//a')
    page.should have_no_xpath('//a')
    using_wait_time 5 do
      # assertions
    end

Nice and updated, thanks.

select "United States", from: "Country", :match => :first

Good stuff, really helpful, thanks!