add a couple of tests for the tag limit feature

spec/features/debates_spec.rb

@@ -130,4 +130,37 @@ feature 'Debates' do
     expect(page).to have_content "Let's..."
   end
 
+  describe 'Limiting tags shown' do
+    let(:all_tags) {
+      ["Hacienda", "Economía", "Medio Ambiente", "Corrupción", "Fiestas populares", "Prensa", "Huelgas"]
+    }
+    let(:debate) {
+      create :debate, tag_list: all_tags
+    }
+
+    scenario 'Index page show up to 5 tags per debate' do
+      debate
+      visible_tags = ["Medio Ambiente", "Corrupción", "Fiestas populares", "Prensa", "Huelgas"]
+
+      visit debates_path
+
+      expect(page).to have_selector('.debate', count: 1)
+      within('.debate') do
+        visible_tags.each do |tag|
+          expect(page).to have_content tag
+        end
+        expect(page).to have_content '2+'
+      end
+    end
+
+    scenario 'Debate#show shows the full tag list' do
+      visit debate_path(debate)
+
+      within("#debate-#{debate.id}") do
+        all_tags.each do |tag|
+          expect(page).to have_content tag
+        end
+      end
+    end
+  end
 end