Do not allow Sidekiq::Worker in AJ::Base classes, #2424

It will not work as intended and lead to much sorrow and misery.

lib/sidekiq/worker.rb

@@ -24,6 +24,8 @@ module Sidekiq
     attr_accessor :jid
 
     def self.included(base)
+      raise ArgumentError, "You cannot include Sidekiq::Worker in an ActiveJob: #{base.name}" if base.ancestors.any? {|c| c.name == 'ActiveJob::Base' }
+
       base.extend(ClassMethods)
       base.class_attribute :sidekiq_options_hash
       base.class_attribute :sidekiq_retry_in_block

test/test_rails.rb

@@ -0,0 +1,23 @@
+require_relative 'helper'
+require 'sidekiq'
+require 'sidekiq/web_helpers'
+
+$HAS_AJ = true
+begin
+  require 'active_job'
+rescue
+  $NO_AJ = false
+end
+
+class TestRails < Sidekiq::Test
+
+  describe 'ActiveJob' do
+    it 'does not allow Sidekiq::Worker in AJ::Base classes' do
+      ex = assert_raises ArgumentError do
+        c = Class.new(ActiveJob::Base)
+        c.include Sidekiq::Worker
+      end
+      assert_includes ex.message, "cannot include"
+    end if $HAS_AJ
+  end
+end