Test capybara visibility

js_steps.rb

Then /^"([^"]+)" should not be visible(?: within "([^\"]*)")?$/ do |text, selector|
  wait_until do
    its_hidden = page.evaluate_script("$('#{selector}:contains(#{text})').is(':hidden');")
    its_not_in_dom = page.evaluate_script("$('#{selector}:contains(#{text})').length == 0;")
    (its_hidden || its_not_in_dom).should be_true
  end
end

Then /^"([^"]+)" should be visible(?: within "([^\"]*)")?$/ do |text, selector|
  wait_until do
    its_hidden = page.evaluate_script("$('#{selector}:contains(#{text})').is(':hidden');")
    its_not_in_dom = page.evaluate_script("$('#{selector}:contains(#{text})').length == 0;")
    (its_hidden || its_not_in_dom).should be_false
  end
end

language_selection.feature

When I follow "¥ JPY"
Then "¥ JPY" should be visible within ".header_nav"
  And "€ EUR" should not be visible within ".header_nav"