Add tests about unit price inside a shopfront

- Test that the unit price wrapper is here
 - Click on the question mark icon and display the tooltip
 - Click outside the question mark icon and hide the toolip

spec/features/consumer/shopping/unit_price_spec.rb

@@ -0,0 +1,48 @@
+require 'spec_helper'
+
+feature "As a consumer, I want to check unit price information for a product", js: true do
+  include AuthenticationHelper
+  include WebHelper
+  include ShopWorkflow
+  include UIComponentHelper
+
+  let(:distributor) { create(:distributor_enterprise, with_payment_and_shipping: true) }
+  let(:supplier) { create(:supplier_enterprise) }
+  let(:oc1) { create(:simple_order_cycle, distributors: [distributor], coordinator: create(:distributor_enterprise), orders_close_at: 2.days.from_now) }
+  let(:product) { create(:simple_product, supplier: supplier) }
+  let(:variant) { product.variants.first }
+  let(:order) { create(:order, distributor: distributor) }
+  let(:exchange1) { oc1.exchanges.to_enterprises(distributor).outgoing.first }
+  let(:user) { create(:user, password: "password", password_confirmation: "password") }
+
+  before do
+    set_order order
+    exchange1.update_attribute :pickup_time, "monday"
+    add_variant_to_order_cycle(exchange1, variant)
+    allow(OpenFoodNetwork::FeatureToggle)
+      .to receive(:enabled?).with(:unit_price, anything) { true }
+  end
+
+  describe "for the shopfront" do
+    before do
+      visit shop_path
+    end
+
+    it "one click on the question mark icon should open the tooltip, another click should close it" do
+      expect(page).to have_selector '.variant-unit-price'
+      within '.variant-unit-price' do 
+        expect(page).to have_selector '.question-mark-icon'
+      end
+      find('.question-mark-icon').click
+      expect(page).to have_selector '.joyride-tip-guide.question-mark-tooltip'
+      within '.joyride-tip-guide.question-mark-tooltip' do 
+        expect(page).to have_content I18n.t('js.shopfront.unit_price_tooltip')
+      end
+
+      page.find("body").click
+      expect(page).not_to have_selector '.joyride-tip-guide.question-mark-tooltip'
+      expect(page).to have_no_content I18n.t('js.shopfront.unit_price_tooltip')
+    end
+
+  end
+end