jobs: migrate user deletions to ActiveJob.

test/jobs/delete_favorites_job_test.rb

@@ -0,0 +1,21 @@
+require 'test_helper'
+
+class DeleteFavoritesJobTest < ActiveJob::TestCase
+  context "DeleteFavoritesJob" do
+    should "delete all favorites" do
+      user = create(:user)
+      posts = create_list(:post, 3)
+      favorites = posts.each { |post| post.add_favorite!(user) }
+
+      assert_equal(3, user.favorite_count)
+      assert_equal(3, user.favorites.count)
+      assert_equal(3, Post.raw_tag_match("fav:#{user.id}").count)
+
+      DeleteFavoritesJob.perform_now(user)
+
+      assert_equal(0, user.reload.favorite_count)
+      assert_equal(0, user.favorites.count)
+      assert_equal(0, Post.raw_tag_match("fav:#{user.id}").count)
+    end
+  end
+end