Added a home controller with an index action

app/controllers/home_controller.rb

@@ -0,0 +1,4 @@
+class HomeController < ApplicationController
+  def index
+  end
+end

app/helpers/home_helper.rb

@@ -0,0 +1,2 @@
+module HomeHelper
+end

app/views/home/index.html.erb

@@ -0,0 +1 @@
+<h1>Hello World!</h1>

config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  get "home/index"
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
   # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.
@@ -10,5 +11,5 @@
   # get "service-worker" => "rails/pwa#service_worker", as: :pwa_service_worker
 
   # Defines the root path route ("/")
-  # root "posts#index"
+  root "home#index"
 end

test/controllers/home_controller_test.rb

@@ -0,0 +1,8 @@
+require "test_helper"
+
+class HomeControllerTest < ActionDispatch::IntegrationTest
+  test "should get index" do
+    get home_index_url
+    assert_response :success
+  end
+end