Design training: Test and external api for storing images

design_training_external_images.rb

################## TEST ######################
# test/controllers/products_controller_test.rb
##############################################
 
  test 'gets an image with its details from an external service' do
    begin
      ENV['IMAGES_FROM_EXTERNAL_SERVICE'] = 'true'
      IMAGE_EXTERNAL_ID = 42
      ImageExternalService.expects(:upload_image_details).with(width: 800, height: 600).returns(IMAGE_EXTERNAL_ID)
      ImageExternalService.expects(:get_image_details).with(IMAGE_EXTERNAL_ID).returns({width: 800, height: 600})

      image = # Create image with: title: 'Item 2', width: 800, height: 600, source: 'unknown', format: 'jpg'

      get product_url(image[:id])

      res = response.parsed_body
      assert_equal 'Item 2', res['title']
      assert_equal 'image', res['kind']
      assert_equal 800, res['width']
    ensure
      ENV.delete('IMAGES_FROM_EXTERNAL_SERVICE')
    end
  end
 
########## EXTERNAL SERVICE API ############
# app/repositories/image_external_service.rb
############################################
 
module ImageExternalService
  def self.get_image_details(id)
    # You don't need to write this code, it's only used in a test where it's mocked
    # call external service...
    # { width: 42, height: 42 }
  end
 
  def self.upload_image_details(width:, height:)
    # You don't need to write this code, it's only used in a test where it's mocked
    # call external service...
    # { id: 42 }
  end
end