sinatra/test/base_test.rb

require File.dirname(__FILE__) + '/helper'

describe 'Sinatra::Base subclasses' do

  class TestApp < Sinatra::Base
    get '/' do
      'Hello World'
    end
  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
      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: ', response.body
    end
  end
end

describe "Sinatra::Base as Rack middleware" do

  app = lambda { |env|
    [210, {'X-Downstream' => 'true'}, ['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
    get '/' do
      'Hello from middleware'
    end
  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

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