inline_rails.rb

# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  git_source(:github) { |repo| "https://github.com/#{repo}.git" }

  ruby "2.7.2"

  gem "rails"
  gem "rspec-rails"
end

require "action_controller/railtie"

class TestApp < Rails::Application
  secrets.secret_token    = "secret_token"
  secrets.secret_key_base = "secret_key_base"

  config.logger = Logger.new($stdout)
  Rails.logger = config.logger

  routes.draw do
    resources :movies, only: :index
  end
end

class MoviesController < ActionController::Base
  #include Rails.application.routes.url_helpers

  def index
    render inline: "<div>It Works!</div>"
  end
end

module ApplicationHelper
end

require "rspec/rails"
require "rspec/autorun"

RSpec.describe "Movies index", type: :request do
  before do
    get "/movies"
  end

  it "responds successfully" do
    expect(response).to have_http_status(:ok)
  end

  it "renders correctly" do
    expect(response.body).to include("It Works!")
  end
end

# Run with RAILS_ENV=test ruby ./inline_rails.rb