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require 'sinatra'

get '/' do
  hello
end

helpers do
  def hello
    'Hello World!'
  end
end

if defined?(RSpec)
  require 'rack/test'
  RSpec.configure { |c| c.include Rack::Test::Methods }

  describe Sinatra::Application do
    def app(); @app ||= Sinatra::Application.new end
    context 'hello をスタブしてないとき、' do
      it 'Hello World! を返す。' do
        get '/'
        expect(last_response.body).to eq('Hello World!')
      end
    end

    context 'hello をスタブしてるとき、' do
      before { allow(app).to receive(:hello).and_return('Hello Stub!') }
      it 'Hello Stub! を返す。' do
        get '/'
        expect(last_response.body).to eq('Hello Stub!')
      end
    end
  end
end