sinatra/test/base_test.rb

require File.expand_path('helper', __dir__)

class BaseTest < Minitest::Test
  describe 'Sinatra::Base subclasses' do
    class TestApp < Sinatra::Base
      get('/') { 'Hello World' }
    end

    class TestKeywordArgumentInitializerApp < Sinatra::Base
      def initialize(argument:)
        @argument = argument
      end

      get('/') { "Hello World with Keyword Arguments: #{@argument}" }
    end

    it 'include Rack::Utils' do
      assert TestApp.included_modules.include?(Rack::Utils)
    end

    it 'processes requests with #call' do
      assert TestApp.respond_to?(:call)

      request = Rack::MockRequest.new(TestApp)
      response = request.get('/')
      assert response.ok?
      assert_equal 'Hello World', response.body
    end

    class TestApp < Sinatra::Base
      get '/state' do
        @foo ||= "new"
        body = "Foo: #{@foo}"
        @foo = 'discard'
        body
      end
    end

    it 'does not maintain state between requests' do
      request = Rack::MockRequest.new(TestApp)
      2.times do
        response = request.get('/state')
        assert response.ok?
        assert_equal 'Foo: new', response.body
      end
    end

    it "passes the subclass to configure blocks" do
      ref = nil
      TestApp.configure { |app| ref = app }
      assert_equal TestApp, ref
    end

    it "allows the configure block arg to be omitted and does not change context" do
      context = nil
      TestApp.configure { context = self }
      assert_equal self, context
    end

    it "allows constructor to receive keyword arguments" do
      app = TestKeywordArgumentInitializerApp.new(argument: "some argument")
      request = Rack::MockRequest.new(app)

      response = request.get('/')

      assert response.ok?
      assert_equal 'Hello World with Keyword Arguments: some argument', response.body
    end
  end

  describe "Sinatra::Base#new" do
    it 'returns a wrapper' do
      assert_equal Sinatra::Wrapper, Sinatra::Base.new.class
    end

    it 'implements a nice inspect' do
      assert_equal '#<Sinatra::Base app_file=nil>', Sinatra::Base.new.inspect
    end

    it 'exposes settings' do
      assert_equal Sinatra::Base.settings, Sinatra::Base.new.settings
    end

    it 'exposes helpers' do
      assert_equal 'image/jpeg', Sinatra::Base.new.helpers.mime_type(:jpg)
    end
  end

  describe "Sinatra::Base as Rack middleware" do
    app = lambda { |env|
      headers = {'X-Downstream' => 'true'}
      headers['X-Route-Missing'] = env['sinatra.route-missing'] || ''
      [210, headers, ['Hello from downstream']] }

    class TestMiddleware < Sinatra::Base
    end

    it 'creates a middleware that responds to #call with .new' do
      middleware = TestMiddleware.new(app)
      assert middleware.respond_to?(:call)
    end

    it 'exposes the downstream app' do
      middleware = TestMiddleware.new!(app)
      assert_same app, middleware.app
    end

    class TestMiddleware < Sinatra::Base
      def route_missing
        env['sinatra.route-missing'] = '1'
        super
      end

      get('/') { 'Hello from middleware' }
    end

    middleware = TestMiddleware.new(app)
    request = Rack::MockRequest.new(middleware)

    it 'intercepts requests' do
      response = request.get('/')
      assert response.ok?
      assert_equal 'Hello from middleware', response.body
    end

    it 'automatically forwards requests downstream when no matching route found' do
      response = request.get('/missing')
      assert_equal 210, response.status
      assert_equal 'Hello from downstream', response.body
    end

    it 'calls #route_missing before forwarding downstream' do
      response = request.get('/missing')
      assert_equal '1', response['X-Route-Missing']
    end

    class TestMiddleware < Sinatra::Base
      get('/low-level-forward') { app.call(env) }
    end

    it 'can call the downstream app directly and return result' do
      response = request.get('/low-level-forward')
      assert_equal 210, response.status
      assert_equal 'true', response['X-Downstream']
      assert_equal 'Hello from downstream', response.body
    end

    class TestMiddleware < Sinatra::Base
      get '/explicit-forward' do
        response['X-Middleware'] = 'true'
        res = forward
        assert_nil res
        assert_equal 210, response.status
        assert_equal 'true', response['X-Downstream']
        assert_equal ['Hello from downstream'], response.body
        'Hello after explicit forward'
      end
    end

    it 'forwards the request downstream and integrates the response into the current context' do
      response = request.get('/explicit-forward')
      assert_equal 210, response.status
      assert_equal 'true', response['X-Downstream']
      assert_equal 'Hello after explicit forward', response.body
      assert_equal '28', response['Content-Length']
    end

    app_content_length = lambda {|env|
      [200, {'Content-Length' => '16'}, 'From downstream!']}

    class TestMiddlewareContentLength < Sinatra::Base
      get '/forward' do
        'From after explicit forward!'
      end
    end

    middleware_content_length = TestMiddlewareContentLength.new(app_content_length)
    request_content_length = Rack::MockRequest.new(middleware_content_length)

    it "sets content length for last response" do
      response = request_content_length.get('/forward')
      assert_equal '28', response['Content-Length']
    end
  end
end