Add words controller with index and show actions

spec/controllers/words_spec.rb

@@ -0,0 +1,22 @@
+require 'rails_helper'
+
+RSpec.describe WordsController, type: :controller do
+  describe "GET :index" do
+    it 'renders the index template' do
+      get :index
+      expect(response).to render_template(:index)
+    end
+
+    it 'sets @words instance variable' do
+      FactoryBot.create(:word)
+      get :index
+      expect(assigns(:words)).to be_a(ActiveRecord::Relation)
+    end
+
+    it 'fetches all words into @words' do
+      5.times { FactoryBot.create(:word) }
+      get :index
+      expect(assigns(:words).count).to eq(5)
+    end
+  end
+end