Dictionary show action for letters, alphabetical links helper

spec/requests/dictionary_spec.rb

@@ -7,4 +7,21 @@ RSpec.describe "Dictionary", type: :request do
       expect(response).to render_template(:index)
     end
   end
+
+  describe "GET /show" do
+    it 'renders the show template' do
+      get "/dictionary/a"
+      expect(response).to render_template(:show)
+    end
+
+    it "sets @letter instance variable" do
+      get "/dictionary/a"
+      expect(assigns(:letter)).to be_a(String)
+    end
+
+    it "sets @words instance variable" do
+      get "/dictionary/a"
+      expect(assigns(:words)).to be_a(ActiveRecord::Relation)
+    end
+  end
 end