Add rspec and request tests

spec/requests/dictionary_spec.rb

@@ -0,0 +1,10 @@
+require 'rails_helper'
+
+RSpec.describe "Dictionary", type: :request do
+  describe "GET /index" do
+    it 'renders the index template' do
+      get "/dictionary"
+      expect(response).to render_template(:index)
+    end
+  end
+end