Note where external services are being used to potentially mock out

refactoring_external_service/youtube_video_list.rb

@@ -1,45 +1,50 @@
-class VideoService
+ class VideoService
   def video_list
+    # NOTE: External service/Maybe
+    video_list_json = File.read('videos.json')
      # Read a json file  and store the contents in an instance variable
-    @video_list = JSON.parse(File.read('videos.json'))
+    @video_list = JSON.parse(video_list_json)
     # Get all the ids of the stored in the contents and JSON file that was just
     ids = @video_list.map{|v| v['youtubeID']}
     # Get authorized with Google to be allowed to make API calls
+    # NOTE: External Service
     client = GoogleAuthorizer.new(
       token_key: 'api-youtube',
       application_name: 'Gateway Youtube Example',
       application_version: '0.1'
       ).api_client
     # Not sure what this does, but I think its a way to tell youtube what I'm asking for
+    # NOTE: External Service
     youtube = client.discovered_api('youtube', 'v3')
     # Send the request to Youtube passing in the ids of the videos from out Json file and telling which
     # data we want from youtube. We want a video snippet, contentDetails(probably a description)
     # and statistics about the video
     request = {
-      api_method: youtube.videos.list, # This looks like there are many api_methods and the one
+      api_method: youtube.videos.list,# NOTE: External Service  # This looks like there are many api_methods and the one
       # we are asking for is the one that returns a list of videos.
       parameters: {
         id: ids.join(","),
         part: 'snippet, contentDetails, statistics',
       }
     }
     # Get the body of the response and parse it with JSON.parse to make into a Ruby hash
+    # NOTE: External Service 
     response = JSON.parse(client.execute!(request).body)
     # Go through the array of ids
-    ids.each do |id| 
+    ids.each do |id|
       # Find the video object that matches the this specific id
       video = @video_list.find{|v| id == v['youtubeID']}
-       # Go through the items from the response and find one that matches the id 
+       # Go through the items from the response and find one that matches the id
       youtube_record = response['items'].find{|v| id == v['id']}
       # Update the views key in the video object(the one we got from our JSON file)
       # with the viewCount from the response we got from youtube.
       video['views'] = youtube_record['statistics']['viewCount'].to_i
       # Find out how many days the video has been live from the response from youtube
       days_available = Date.today - Date.parse(youtube_record['snippet']['publishedAt'])
        # Update the monthly views of the video
-      video['monthlyViews'] = video['views'] * 365.0 / days_available / 12      
+      video['monthlyViews'] = video['views'] * 365.0 / days_available / 12
     end
     # return the updated video list in a JSON dump
     return JSON.dump(@video_list)
   end
-end
+end

refactoring_external_service/youtube_video_list_spec.rb

@@ -0,0 +1,7 @@
+require 'test/unit'
+require './youtube_video_list'
+
+class VideoServiceTest < Test::Unit::TestCase
+
+
+end