Enforce frozen string in Rubocop

101 files changed, 101 insertions, 0 deletions

diff --git a/activejob/Rakefile b/activejob/Rakefile
index dd03ab0b8f..5d0d22e88b 100644
--- a/activejob/Rakefile
+++ b/activejob/Rakefile
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "rake/testtask"
 
 #TODO: add qu back to the list after it support Rails 5.1
diff --git a/activejob/activejob.gemspec b/activejob/activejob.gemspec
index bdf23223d1..d3fe7b45e7 100644
--- a/activejob/activejob.gemspec
+++ b/activejob/activejob.gemspec
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 version = File.read(File.expand_path("../RAILS_VERSION", __dir__)).strip
 
 Gem::Specification.new do |s|
diff --git a/activejob/bin/test b/activejob/bin/test
index 470ce93f10..c53377cc97 100755
--- a/activejob/bin/test
+++ b/activejob/bin/test
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 COMPONENT_ROOT = File.expand_path("..", __dir__)
 require_relative "../../tools/test"
diff --git a/activejob/lib/active_job.rb b/activejob/lib/active_job.rb
index 8b7aef65a2..c94903854a 100644
--- a/activejob/lib/active_job.rb
+++ b/activejob/lib/active_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 #--
 # Copyright (c) 2014-2017 David Heinemeier Hansson
 #
diff --git a/activejob/lib/active_job/arguments.rb b/activejob/lib/active_job/arguments.rb
index 523a0e7f33..dde7d7afa6 100644
--- a/activejob/lib/active_job/arguments.rb
+++ b/activejob/lib/active_job/arguments.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/core_ext/hash"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/base.rb b/activejob/lib/active_job/base.rb
index 18e8641e50..c4eec7ea78 100644
--- a/activejob/lib/active_job/base.rb
+++ b/activejob/lib/active_job/base.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_job/core"
 require "active_job/queue_adapter"
 require "active_job/queue_name"
diff --git a/activejob/lib/active_job/callbacks.rb b/activejob/lib/active_job/callbacks.rb
index 9aebc880a5..ab225a93d3 100644
--- a/activejob/lib/active_job/callbacks.rb
+++ b/activejob/lib/active_job/callbacks.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/callbacks"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/configured_job.rb b/activejob/lib/active_job/configured_job.rb
index 2ff31f2dae..79c197d531 100644
--- a/activejob/lib/active_job/configured_job.rb
+++ b/activejob/lib/active_job/configured_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   class ConfiguredJob #:nodoc:
     def initialize(job_class, options = {})
diff --git a/activejob/lib/active_job/core.rb b/activejob/lib/active_job/core.rb
index e3e63f227e..7f1d4efc65 100644
--- a/activejob/lib/active_job/core.rb
+++ b/activejob/lib/active_job/core.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   # Provides general behavior that will be included into every Active Job
   # object that inherits from ActiveJob::Base.
diff --git a/activejob/lib/active_job/enqueuing.rb b/activejob/lib/active_job/enqueuing.rb
index c73117e7f3..d1dbc4539e 100644
--- a/activejob/lib/active_job/enqueuing.rb
+++ b/activejob/lib/active_job/enqueuing.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_job/arguments"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/exceptions.rb b/activejob/lib/active_job/exceptions.rb
index c1b5d35313..3a91cbc0b6 100644
--- a/activejob/lib/active_job/exceptions.rb
+++ b/activejob/lib/active_job/exceptions.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/core_ext/numeric/time"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/execution.rb b/activejob/lib/active_job/execution.rb
index 94d30c8eaf..ddffabe0ee 100644
--- a/activejob/lib/active_job/execution.rb
+++ b/activejob/lib/active_job/execution.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/rescuable"
 require "active_job/arguments"
 
diff --git a/activejob/lib/active_job/gem_version.rb b/activejob/lib/active_job/gem_version.rb
index bf81f37e81..0e414f1b11 100644
--- a/activejob/lib/active_job/gem_version.rb
+++ b/activejob/lib/active_job/gem_version.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   # Returns the version of the currently loaded Active Job as a <tt>Gem::Version</tt>
   def self.gem_version
diff --git a/activejob/lib/active_job/logging.rb b/activejob/lib/active_job/logging.rb
index ddc4915fd3..8f8f4cb244 100644
--- a/activejob/lib/active_job/logging.rb
+++ b/activejob/lib/active_job/logging.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/core_ext/hash/transform_values"
 require "active_support/core_ext/string/filters"
 require "active_support/tagged_logging"
diff --git a/activejob/lib/active_job/queue_adapter.rb b/activejob/lib/active_job/queue_adapter.rb
index b22d8b8347..8f4d40de19 100644
--- a/activejob/lib/active_job/queue_adapter.rb
+++ b/activejob/lib/active_job/queue_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/core_ext/string/inflections"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/queue_adapters.rb b/activejob/lib/active_job/queue_adapters.rb
index c8eedb6156..b89a62319a 100644
--- a/activejob/lib/active_job/queue_adapters.rb
+++ b/activejob/lib/active_job/queue_adapters.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   # == Active Job adapters
   #
diff --git a/activejob/lib/active_job/queue_adapters/async_adapter.rb b/activejob/lib/active_job/queue_adapters/async_adapter.rb
index e2bff9e646..d2fc686339 100644
--- a/activejob/lib/active_job/queue_adapters/async_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/async_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "securerandom"
 require "concurrent/scheduled_task"
 require "concurrent/executor/thread_pool_executor"
diff --git a/activejob/lib/active_job/queue_adapters/backburner_adapter.rb b/activejob/lib/active_job/queue_adapters/backburner_adapter.rb
index e3eccce62b..63519df551 100644
--- a/activejob/lib/active_job/queue_adapters/backburner_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/backburner_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "backburner"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/queue_adapters/delayed_job_adapter.rb b/activejob/lib/active_job/queue_adapters/delayed_job_adapter.rb
index 83ad2e767d..54a5af2ae6 100644
--- a/activejob/lib/active_job/queue_adapters/delayed_job_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/delayed_job_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "delayed_job"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/queue_adapters/inline_adapter.rb b/activejob/lib/active_job/queue_adapters/inline_adapter.rb
index 0496f8449e..e793fff89d 100644
--- a/activejob/lib/active_job/queue_adapters/inline_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/inline_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   module QueueAdapters
     # == Active Job Inline adapter
diff --git a/activejob/lib/active_job/queue_adapters/qu_adapter.rb b/activejob/lib/active_job/queue_adapters/qu_adapter.rb
index e8994533e4..9b2072f611 100644
--- a/activejob/lib/active_job/queue_adapters/qu_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/qu_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "qu"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/queue_adapters/que_adapter.rb b/activejob/lib/active_job/queue_adapters/que_adapter.rb
index 0e698f0d79..e72899a1cb 100644
--- a/activejob/lib/active_job/queue_adapters/que_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/que_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "que"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb b/activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb
index 1115eb88ae..53fb0d83b4 100644
--- a/activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/queue_classic_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "queue_classic"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/queue_adapters/resque_adapter.rb b/activejob/lib/active_job/queue_adapters/resque_adapter.rb
index 2df157ef89..f9cefd3c33 100644
--- a/activejob/lib/active_job/queue_adapters/resque_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/resque_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "resque"
 require "active_support/core_ext/enumerable"
 require "active_support/core_ext/array/access"
diff --git a/activejob/lib/active_job/queue_adapters/sidekiq_adapter.rb b/activejob/lib/active_job/queue_adapters/sidekiq_adapter.rb
index 895cc1f981..35f399b0f0 100644
--- a/activejob/lib/active_job/queue_adapters/sidekiq_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/sidekiq_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "sidekiq"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/queue_adapters/sneakers_adapter.rb b/activejob/lib/active_job/queue_adapters/sneakers_adapter.rb
index f00acfc04a..972ff5af0f 100644
--- a/activejob/lib/active_job/queue_adapters/sneakers_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/sneakers_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "sneakers"
 require "monitor"
 
diff --git a/activejob/lib/active_job/queue_adapters/sucker_punch_adapter.rb b/activejob/lib/active_job/queue_adapters/sucker_punch_adapter.rb
index dd59a79813..2ba9372f4f 100644
--- a/activejob/lib/active_job/queue_adapters/sucker_punch_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/sucker_punch_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "sucker_punch"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/queue_adapters/test_adapter.rb b/activejob/lib/active_job/queue_adapters/test_adapter.rb
index 1b633b210e..5972b28156 100644
--- a/activejob/lib/active_job/queue_adapters/test_adapter.rb
+++ b/activejob/lib/active_job/queue_adapters/test_adapter.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   module QueueAdapters
     # == Test adapter for Active Job
diff --git a/activejob/lib/active_job/queue_name.rb b/activejob/lib/active_job/queue_name.rb
index 6f521a1c1a..22ebd5e3fc 100644
--- a/activejob/lib/active_job/queue_name.rb
+++ b/activejob/lib/active_job/queue_name.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   module QueueName
     extend ActiveSupport::Concern
diff --git a/activejob/lib/active_job/queue_priority.rb b/activejob/lib/active_job/queue_priority.rb
index 399d7a135a..fd1c0f6286 100644
--- a/activejob/lib/active_job/queue_priority.rb
+++ b/activejob/lib/active_job/queue_priority.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   module QueuePriority
     extend ActiveSupport::Concern
diff --git a/activejob/lib/active_job/railtie.rb b/activejob/lib/active_job/railtie.rb
index 4a8bf04d70..8adbd3473c 100644
--- a/activejob/lib/active_job/railtie.rb
+++ b/activejob/lib/active_job/railtie.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "global_id/railtie"
 require "active_job"
 
diff --git a/activejob/lib/active_job/test_case.rb b/activejob/lib/active_job/test_case.rb
index a5ec45e4a7..028ff552bf 100644
--- a/activejob/lib/active_job/test_case.rb
+++ b/activejob/lib/active_job/test_case.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/test_case"
 
 module ActiveJob
diff --git a/activejob/lib/active_job/test_helper.rb b/activejob/lib/active_job/test_helper.rb
index a61e4f59a5..60ca1b5f1b 100644
--- a/activejob/lib/active_job/test_helper.rb
+++ b/activejob/lib/active_job/test_helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/core_ext/class/subclasses"
 require "active_support/core_ext/hash/keys"
 
diff --git a/activejob/lib/active_job/translation.rb b/activejob/lib/active_job/translation.rb
index 67e4cf4ab9..71c4cb24af 100644
--- a/activejob/lib/active_job/translation.rb
+++ b/activejob/lib/active_job/translation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ActiveJob
   module Translation #:nodoc:
     extend ActiveSupport::Concern
diff --git a/activejob/lib/active_job/version.rb b/activejob/lib/active_job/version.rb
index 60b463817f..afff4271d4 100644
--- a/activejob/lib/active_job/version.rb
+++ b/activejob/lib/active_job/version.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "gem_version"
 
 module ActiveJob
diff --git a/activejob/lib/rails/generators/job/job_generator.rb b/activejob/lib/rails/generators/job/job_generator.rb
index 474f181f65..dce4e3a3fe 100644
--- a/activejob/lib/rails/generators/job/job_generator.rb
+++ b/activejob/lib/rails/generators/job/job_generator.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "rails/generators/named_base"
 
 module Rails # :nodoc:
diff --git a/activejob/test/adapters/async.rb b/activejob/test/adapters/async.rb
index 08eb9658cd..d5a61d7684 100644
--- a/activejob/test/adapters/async.rb
+++ b/activejob/test/adapters/async.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 ActiveJob::Base.queue_adapter = :async
 ActiveJob::Base.queue_adapter.immediate = true
diff --git a/activejob/test/adapters/backburner.rb b/activejob/test/adapters/backburner.rb
index 17ba07b802..cfc97432f2 100644
--- a/activejob/test/adapters/backburner.rb
+++ b/activejob/test/adapters/backburner.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "support/backburner/inline"
 
 ActiveJob::Base.queue_adapter = :backburner
diff --git a/activejob/test/adapters/delayed_job.rb b/activejob/test/adapters/delayed_job.rb
index 98e41c0c36..3aa646555a 100644
--- a/activejob/test/adapters/delayed_job.rb
+++ b/activejob/test/adapters/delayed_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 ActiveJob::Base.queue_adapter = :delayed_job
 
 $LOAD_PATH << File.expand_path("../support/delayed_job", __dir__)
diff --git a/activejob/test/adapters/inline.rb b/activejob/test/adapters/inline.rb
index 24113dfa5a..ec3f0940e6 100644
--- a/activejob/test/adapters/inline.rb
+++ b/activejob/test/adapters/inline.rb
@@ -1 +1,2 @@
+# frozen_string_literal: true
 ActiveJob::Base.queue_adapter = :inline
diff --git a/activejob/test/adapters/qu.rb b/activejob/test/adapters/qu.rb
index b89c504091..f8e7eb624d 100644
--- a/activejob/test/adapters/qu.rb
+++ b/activejob/test/adapters/qu.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "qu-immediate"
 
 ActiveJob::Base.queue_adapter = :qu
diff --git a/activejob/test/adapters/que.rb b/activejob/test/adapters/que.rb
index 0c49274a4e..0d27bb8fc9 100644
--- a/activejob/test/adapters/que.rb
+++ b/activejob/test/adapters/que.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "support/que/inline"
 
 ActiveJob::Base.queue_adapter = :que
diff --git a/activejob/test/adapters/queue_classic.rb b/activejob/test/adapters/queue_classic.rb
index e301a7ca96..f57057c914 100644
--- a/activejob/test/adapters/queue_classic.rb
+++ b/activejob/test/adapters/queue_classic.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 require "support/queue_classic/inline"
 ActiveJob::Base.queue_adapter = :queue_classic
diff --git a/activejob/test/adapters/resque.rb b/activejob/test/adapters/resque.rb
index af7080358d..6c732c1e33 100644
--- a/activejob/test/adapters/resque.rb
+++ b/activejob/test/adapters/resque.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 ActiveJob::Base.queue_adapter = :resque
 Resque.inline = true
diff --git a/activejob/test/adapters/sidekiq.rb b/activejob/test/adapters/sidekiq.rb
index 8036331ef1..6cc64e7684 100644
--- a/activejob/test/adapters/sidekiq.rb
+++ b/activejob/test/adapters/sidekiq.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 require "sidekiq/testing/inline"
 ActiveJob::Base.queue_adapter = :sidekiq
diff --git a/activejob/test/adapters/sneakers.rb b/activejob/test/adapters/sneakers.rb
index 159c0d1906..85f6b74144 100644
--- a/activejob/test/adapters/sneakers.rb
+++ b/activejob/test/adapters/sneakers.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 require "support/sneakers/inline"
 ActiveJob::Base.queue_adapter = :sneakers
diff --git a/activejob/test/adapters/sucker_punch.rb b/activejob/test/adapters/sucker_punch.rb
index 5661b6ee92..45b5fa1db2 100644
--- a/activejob/test/adapters/sucker_punch.rb
+++ b/activejob/test/adapters/sucker_punch.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 require "sucker_punch/testing/inline"
 ActiveJob::Base.queue_adapter = :sucker_punch
diff --git a/activejob/test/adapters/test.rb b/activejob/test/adapters/test.rb
index 7180b38a57..965f7e91a2 100644
--- a/activejob/test/adapters/test.rb
+++ b/activejob/test/adapters/test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 ActiveJob::Base.queue_adapter = :test
 ActiveJob::Base.queue_adapter.perform_enqueued_jobs = true
 ActiveJob::Base.queue_adapter.perform_enqueued_at_jobs = true
diff --git a/activejob/test/cases/adapter_test.rb b/activejob/test/cases/adapter_test.rb
index caf5d44a5e..764ce3ccbc 100644
--- a/activejob/test/cases/adapter_test.rb
+++ b/activejob/test/cases/adapter_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 
 class AdapterTest < ActiveSupport::TestCase
diff --git a/activejob/test/cases/argument_serialization_test.rb b/activejob/test/cases/argument_serialization_test.rb
index 7934d8e556..ebd9a4fe41 100644
--- a/activejob/test/cases/argument_serialization_test.rb
+++ b/activejob/test/cases/argument_serialization_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "active_job/arguments"
 require "models/person"
diff --git a/activejob/test/cases/callbacks_test.rb b/activejob/test/cases/callbacks_test.rb
index 8d1c9c3058..fbca367ae9 100644
--- a/activejob/test/cases/callbacks_test.rb
+++ b/activejob/test/cases/callbacks_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/callback_job"
 
diff --git a/activejob/test/cases/exceptions_test.rb b/activejob/test/cases/exceptions_test.rb
index dbe55f7430..5f56d47e8e 100644
--- a/activejob/test/cases/exceptions_test.rb
+++ b/activejob/test/cases/exceptions_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/retry_job"
 
diff --git a/activejob/test/cases/job_serialization_test.rb b/activejob/test/cases/job_serialization_test.rb
index c737557ece..fa8d98ddca 100644
--- a/activejob/test/cases/job_serialization_test.rb
+++ b/activejob/test/cases/job_serialization_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/gid_job"
 require "jobs/hello_job"
diff --git a/activejob/test/cases/logging_test.rb b/activejob/test/cases/logging_test.rb
index d5ca0f385c..117d9b23a3 100644
--- a/activejob/test/cases/logging_test.rb
+++ b/activejob/test/cases/logging_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "active_support/log_subscriber/test_helper"
 require "active_support/core_ext/numeric/time"
diff --git a/activejob/test/cases/queue_adapter_test.rb b/activejob/test/cases/queue_adapter_test.rb
index 8368107bdf..6061fb2127 100644
--- a/activejob/test/cases/queue_adapter_test.rb
+++ b/activejob/test/cases/queue_adapter_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 
 module ActiveJob
diff --git a/activejob/test/cases/queue_naming_test.rb b/activejob/test/cases/queue_naming_test.rb
index 0247bc111e..8ba4324c46 100644
--- a/activejob/test/cases/queue_naming_test.rb
+++ b/activejob/test/cases/queue_naming_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/hello_job"
 require "jobs/logging_job"
diff --git a/activejob/test/cases/queue_priority_test.rb b/activejob/test/cases/queue_priority_test.rb
index 171fb1e593..416498c270 100644
--- a/activejob/test/cases/queue_priority_test.rb
+++ b/activejob/test/cases/queue_priority_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/hello_job"
 
diff --git a/activejob/test/cases/queuing_test.rb b/activejob/test/cases/queuing_test.rb
index a3ecb15c31..44f674a2ee 100644
--- a/activejob/test/cases/queuing_test.rb
+++ b/activejob/test/cases/queuing_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/hello_job"
 require "active_support/core_ext/numeric/time"
diff --git a/activejob/test/cases/rescue_test.rb b/activejob/test/cases/rescue_test.rb
index afb1b48831..c2a991cb2d 100644
--- a/activejob/test/cases/rescue_test.rb
+++ b/activejob/test/cases/rescue_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/rescue_job"
 require "models/person"
diff --git a/activejob/test/cases/test_case_test.rb b/activejob/test/cases/test_case_test.rb
index 3db2d9dec7..eb320a98d1 100644
--- a/activejob/test/cases/test_case_test.rb
+++ b/activejob/test/cases/test_case_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/hello_job"
 require "jobs/logging_job"
diff --git a/activejob/test/cases/test_helper_test.rb b/activejob/test/cases/test_helper_test.rb
index 81e75b4374..0f8174663e 100644
--- a/activejob/test/cases/test_helper_test.rb
+++ b/activejob/test/cases/test_helper_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "active_support/core_ext/time"
 require "active_support/core_ext/date"
diff --git a/activejob/test/cases/translation_test.rb b/activejob/test/cases/translation_test.rb
index 27bfd50985..d6782a38bd 100644
--- a/activejob/test/cases/translation_test.rb
+++ b/activejob/test/cases/translation_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/translated_hello_job"
 
diff --git a/activejob/test/helper.rb b/activejob/test/helper.rb
index db07ecab7a..edcf159056 100644
--- a/activejob/test/helper.rb
+++ b/activejob/test/helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_job"
 require "support/job_buffer"
 
diff --git a/activejob/test/integration/queuing_test.rb b/activejob/test/integration/queuing_test.rb
index 2669c52a1c..72c66d111f 100644
--- a/activejob/test/integration/queuing_test.rb
+++ b/activejob/test/integration/queuing_test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "helper"
 require "jobs/logging_job"
 require "jobs/hello_job"
diff --git a/activejob/test/jobs/application_job.rb b/activejob/test/jobs/application_job.rb
index a009ace51c..32fe70b8e4 100644
--- a/activejob/test/jobs/application_job.rb
+++ b/activejob/test/jobs/application_job.rb
@@ -1,2 +1,3 @@
+# frozen_string_literal: true
 class ApplicationJob < ActiveJob::Base
 end
diff --git a/activejob/test/jobs/callback_job.rb b/activejob/test/jobs/callback_job.rb
index ca2a8e031a..7c5b161437 100644
--- a/activejob/test/jobs/callback_job.rb
+++ b/activejob/test/jobs/callback_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class CallbackJob < ActiveJob::Base
   before_perform ->(job) { job.history << "CallbackJob ran before_perform" }
   after_perform ->(job) { job.history << "CallbackJob ran after_perform" }
diff --git a/activejob/test/jobs/gid_job.rb b/activejob/test/jobs/gid_job.rb
index c7cfa6e7a2..c43e25a796 100644
--- a/activejob/test/jobs/gid_job.rb
+++ b/activejob/test/jobs/gid_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "../support/job_buffer"
 
 class GidJob < ActiveJob::Base
diff --git a/activejob/test/jobs/hello_job.rb b/activejob/test/jobs/hello_job.rb
index 126fefae00..79e1d6a6f4 100644
--- a/activejob/test/jobs/hello_job.rb
+++ b/activejob/test/jobs/hello_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "../support/job_buffer"
 
 class HelloJob < ActiveJob::Base
diff --git a/activejob/test/jobs/inherited_job.rb b/activejob/test/jobs/inherited_job.rb
index 60fca66f88..58b6582154 100644
--- a/activejob/test/jobs/inherited_job.rb
+++ b/activejob/test/jobs/inherited_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "application_job"
 
 class InheritedJob < ApplicationJob
diff --git a/activejob/test/jobs/kwargs_job.rb b/activejob/test/jobs/kwargs_job.rb
index 9f9d809673..ccd9811595 100644
--- a/activejob/test/jobs/kwargs_job.rb
+++ b/activejob/test/jobs/kwargs_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "../support/job_buffer"
 
 class KwargsJob < ActiveJob::Base
diff --git a/activejob/test/jobs/logging_job.rb b/activejob/test/jobs/logging_job.rb
index 119b32fa67..1a47601fde 100644
--- a/activejob/test/jobs/logging_job.rb
+++ b/activejob/test/jobs/logging_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class LoggingJob < ActiveJob::Base
   def perform(dummy)
     logger.info "Dummy, here is it: #{dummy}"
diff --git a/activejob/test/jobs/nested_job.rb b/activejob/test/jobs/nested_job.rb
index 21b7692cd1..891a2f952e 100644
--- a/activejob/test/jobs/nested_job.rb
+++ b/activejob/test/jobs/nested_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class NestedJob < ActiveJob::Base
   def perform
     LoggingJob.perform_later "NestedJob"
diff --git a/activejob/test/jobs/overridden_logging_job.rb b/activejob/test/jobs/overridden_logging_job.rb
index 2b17a65142..808d6e30e6 100644
--- a/activejob/test/jobs/overridden_logging_job.rb
+++ b/activejob/test/jobs/overridden_logging_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class OverriddenLoggingJob < ActiveJob::Base
   def perform(dummy)
     logger.info "Dummy, here is it: #{dummy}"
diff --git a/activejob/test/jobs/provider_jid_job.rb b/activejob/test/jobs/provider_jid_job.rb
index 0c8ba040f5..71ed23e9bb 100644
--- a/activejob/test/jobs/provider_jid_job.rb
+++ b/activejob/test/jobs/provider_jid_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "../support/job_buffer"
 
 class ProviderJidJob < ActiveJob::Base
diff --git a/activejob/test/jobs/queue_adapter_job.rb b/activejob/test/jobs/queue_adapter_job.rb
index 160dfd74ec..7058ab2087 100644
--- a/activejob/test/jobs/queue_adapter_job.rb
+++ b/activejob/test/jobs/queue_adapter_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class QueueAdapterJob < ActiveJob::Base
   self.queue_adapter = :inline
 end
diff --git a/activejob/test/jobs/queue_as_job.rb b/activejob/test/jobs/queue_as_job.rb
index 7dc318e736..ab3075aa77 100644
--- a/activejob/test/jobs/queue_as_job.rb
+++ b/activejob/test/jobs/queue_as_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "../support/job_buffer"
 
 class QueueAsJob < ActiveJob::Base
diff --git a/activejob/test/jobs/rescue_job.rb b/activejob/test/jobs/rescue_job.rb
index 62add4271a..fd78820bfe 100644
--- a/activejob/test/jobs/rescue_job.rb
+++ b/activejob/test/jobs/rescue_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "../support/job_buffer"
 
 class RescueJob < ActiveJob::Base
diff --git a/activejob/test/jobs/retry_job.rb b/activejob/test/jobs/retry_job.rb
index c02febc50c..b121296441 100644
--- a/activejob/test/jobs/retry_job.rb
+++ b/activejob/test/jobs/retry_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "../support/job_buffer"
 require "active_support/core_ext/integer/inflections"
 
diff --git a/activejob/test/jobs/translated_hello_job.rb b/activejob/test/jobs/translated_hello_job.rb
index 56e9f147b9..67ddca2f41 100644
--- a/activejob/test/jobs/translated_hello_job.rb
+++ b/activejob/test/jobs/translated_hello_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require_relative "../support/job_buffer"
 
 class TranslatedHelloJob < ActiveJob::Base
diff --git a/activejob/test/models/person.rb b/activejob/test/models/person.rb
index b5d68ad9c1..bcd1018782 100644
--- a/activejob/test/models/person.rb
+++ b/activejob/test/models/person.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class Person
   class RecordNotFound < StandardError; end
 
diff --git a/activejob/test/support/backburner/inline.rb b/activejob/test/support/backburner/inline.rb
index 9758332b6f..304f9c781c 100644
--- a/activejob/test/support/backburner/inline.rb
+++ b/activejob/test/support/backburner/inline.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "backburner"
 
 Backburner::Worker.class_eval do
diff --git a/activejob/test/support/delayed_job/delayed/backend/test.rb b/activejob/test/support/delayed_job/delayed/backend/test.rb
index 68288c062b..ed3b252042 100644
--- a/activejob/test/support/delayed_job/delayed/backend/test.rb
+++ b/activejob/test/support/delayed_job/delayed/backend/test.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 #copied from https://github.com/collectiveidea/delayed_job/blob/master/spec/delayed/backend/test.rb
 require "ostruct"
 
diff --git a/activejob/test/support/integration/adapters/async.rb b/activejob/test/support/integration/adapters/async.rb
index 44ab98437a..19aea8472e 100644
--- a/activejob/test/support/integration/adapters/async.rb
+++ b/activejob/test/support/integration/adapters/async.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module AsyncJobsManager
   def setup
     ActiveJob::Base.queue_adapter = :async
diff --git a/activejob/test/support/integration/adapters/backburner.rb b/activejob/test/support/integration/adapters/backburner.rb
index 2e194933a1..fd1e7697c5 100644
--- a/activejob/test/support/integration/adapters/backburner.rb
+++ b/activejob/test/support/integration/adapters/backburner.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module BackburnerJobsManager
   def setup
     ActiveJob::Base.queue_adapter = :backburner
diff --git a/activejob/test/support/integration/adapters/delayed_job.rb b/activejob/test/support/integration/adapters/delayed_job.rb
index 2adbbcd88f..73e1a04e45 100644
--- a/activejob/test/support/integration/adapters/delayed_job.rb
+++ b/activejob/test/support/integration/adapters/delayed_job.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "delayed_job"
 require "delayed_job_active_record"
 
diff --git a/activejob/test/support/integration/adapters/inline.rb b/activejob/test/support/integration/adapters/inline.rb
index e06b34c976..c669793dba 100644
--- a/activejob/test/support/integration/adapters/inline.rb
+++ b/activejob/test/support/integration/adapters/inline.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module InlineJobsManager
   def setup
     ActiveJob::Base.queue_adapter = :inline
diff --git a/activejob/test/support/integration/adapters/qu.rb b/activejob/test/support/integration/adapters/qu.rb
index 71819f5a55..b2f63d8f94 100644
--- a/activejob/test/support/integration/adapters/qu.rb
+++ b/activejob/test/support/integration/adapters/qu.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module QuJobsManager
   def setup
     require "qu-rails"
diff --git a/activejob/test/support/integration/adapters/que.rb b/activejob/test/support/integration/adapters/que.rb
index 20faee3427..cf1160d2bc 100644
--- a/activejob/test/support/integration/adapters/que.rb
+++ b/activejob/test/support/integration/adapters/que.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module QueJobsManager
   def setup
     require "sequel"
diff --git a/activejob/test/support/integration/adapters/queue_classic.rb b/activejob/test/support/integration/adapters/queue_classic.rb
index 369693e947..7f1308c5d3 100644
--- a/activejob/test/support/integration/adapters/queue_classic.rb
+++ b/activejob/test/support/integration/adapters/queue_classic.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module QueueClassicJobsManager
   def setup
     ENV["QC_DATABASE_URL"] ||= "postgres:///active_jobs_qc_int_test"
diff --git a/activejob/test/support/integration/adapters/resque.rb b/activejob/test/support/integration/adapters/resque.rb
index a21a1786c9..ef2dd75687 100644
--- a/activejob/test/support/integration/adapters/resque.rb
+++ b/activejob/test/support/integration/adapters/resque.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module ResqueJobsManager
   def setup
     ActiveJob::Base.queue_adapter = :resque
diff --git a/activejob/test/support/integration/adapters/sidekiq.rb b/activejob/test/support/integration/adapters/sidekiq.rb
index bbb575f6da..8c90410e76 100644
--- a/activejob/test/support/integration/adapters/sidekiq.rb
+++ b/activejob/test/support/integration/adapters/sidekiq.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "sidekiq/api"
 
 require "sidekiq/testing"
diff --git a/activejob/test/support/integration/adapters/sneakers.rb b/activejob/test/support/integration/adapters/sneakers.rb
index 1c8dfaca59..dc42501ff3 100644
--- a/activejob/test/support/integration/adapters/sneakers.rb
+++ b/activejob/test/support/integration/adapters/sneakers.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "sneakers/runner"
 require "sneakers/publisher"
 require "timeout"
diff --git a/activejob/test/support/integration/adapters/sucker_punch.rb b/activejob/test/support/integration/adapters/sucker_punch.rb
index 9c0d66b469..e528f24261 100644
--- a/activejob/test/support/integration/adapters/sucker_punch.rb
+++ b/activejob/test/support/integration/adapters/sucker_punch.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module SuckerPunchJobsManager
   def setup
     ActiveJob::Base.queue_adapter = :sucker_punch
diff --git a/activejob/test/support/integration/dummy_app_template.rb b/activejob/test/support/integration/dummy_app_template.rb
index 14fe3c9adc..a054ecea08 100644
--- a/activejob/test/support/integration/dummy_app_template.rb
+++ b/activejob/test/support/integration/dummy_app_template.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 if ENV["AJ_ADAPTER"] == "delayed_job"
   generate "delayed_job:active_record", "--quiet"
 end
diff --git a/activejob/test/support/integration/helper.rb b/activejob/test/support/integration/helper.rb
index 545b62752e..c0aa14c4c2 100644
--- a/activejob/test/support/integration/helper.rb
+++ b/activejob/test/support/integration/helper.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 puts "\n\n*** rake aj:integration:#{ENV['AJ_ADAPTER']} ***\n"
 
 ENV["RAILS_ENV"] = "test"
diff --git a/activejob/test/support/integration/jobs_manager.rb b/activejob/test/support/integration/jobs_manager.rb
index 488756437b..1cfbd60dc4 100644
--- a/activejob/test/support/integration/jobs_manager.rb
+++ b/activejob/test/support/integration/jobs_manager.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class JobsManager
   @@managers = {}
   attr :adapter_name
diff --git a/activejob/test/support/integration/test_case_helpers.rb b/activejob/test/support/integration/test_case_helpers.rb
index 41bf9c89d1..add719187c 100644
--- a/activejob/test/support/integration/test_case_helpers.rb
+++ b/activejob/test/support/integration/test_case_helpers.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "active_support/core_ext/string/inflections"
 require "support/integration/jobs_manager"
 
diff --git a/activejob/test/support/job_buffer.rb b/activejob/test/support/job_buffer.rb
index 620cb5288d..3146d06d54 100644
--- a/activejob/test/support/job_buffer.rb
+++ b/activejob/test/support/job_buffer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 module JobBuffer
   class << self
     def clear
diff --git a/activejob/test/support/que/inline.rb b/activejob/test/support/que/inline.rb
index 55eb0d01ef..e204f8154a 100644
--- a/activejob/test/support/que/inline.rb
+++ b/activejob/test/support/que/inline.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "que"
 
 Que::Job.class_eval do
diff --git a/activejob/test/support/queue_classic/inline.rb b/activejob/test/support/queue_classic/inline.rb
index dcd834ecce..955469e5a8 100644
--- a/activejob/test/support/queue_classic/inline.rb
+++ b/activejob/test/support/queue_classic/inline.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "queue_classic"
 
 module QC
diff --git a/activejob/test/support/sneakers/inline.rb b/activejob/test/support/sneakers/inline.rb
index cf102ae5c2..46882870d5 100644
--- a/activejob/test/support/sneakers/inline.rb
+++ b/activejob/test/support/sneakers/inline.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 require "sneakers"
 
 module Sneakers