Add price expiration

#522

spec/features/admin/billing/prices/list_spec.rb

@@ -0,0 +1,33 @@
+require 'rails_helper'
+
+RSpec.feature 'Viewing prices in admin area', settings: false do
+  given!(:unexpired_price) { create(:unexpired_price) }
+  given!(:expired_price) { create(:expired_price) }
+
+  background do
+    sign_in_to_admin_area
+  end
+
+  describe 'search' do
+    context 'when validity is not selected' do
+      scenario 'shows unexpired prices' do
+        visit admin_prices_path
+        expect(page).to have_css('.price', count: 1)
+      end
+    end
+
+    context 'when validity is given' do
+      scenario 'filters by given validity' do
+        visit admin_prices_path
+        select 'unexpired', from: 'search_validity'
+        submit_search_form
+
+        expect(page).to have_css('.price', count: 1)
+      end
+    end
+
+    def submit_search_form
+      find('.price-search-form-search-btn').click
+    end
+  end
+end