Import Action Mailbox

27 files changed, 553 insertions, 0 deletions

diff --git a/actionmailbox/test/dummy/config/application.rb b/actionmailbox/test/dummy/config/application.rb
new file mode 100644
index 0000000000..ffba407fd7
--- /dev/null
+++ b/actionmailbox/test/dummy/config/application.rb
@@ -0,0 +1,17 @@
+require_relative 'boot'
+
+require 'rails/all'
+
+Bundler.require(*Rails.groups)
+
+module Dummy
+  class Application < Rails::Application
+    # Initialize configuration defaults for originally generated Rails version.
+    config.load_defaults 5.2
+
+    # Settings in config/environments/* take precedence over those specified here.
+    # Application configuration can go into files in config/initializers
+    # -- all .rb files in that directory are automatically loaded after loading
+    # the framework and any gems in your application.
+  end
+end
diff --git a/actionmailbox/test/dummy/config/boot.rb b/actionmailbox/test/dummy/config/boot.rb
new file mode 100644
index 0000000000..c9aef85d40
--- /dev/null
+++ b/actionmailbox/test/dummy/config/boot.rb
@@ -0,0 +1,5 @@
+# Set up gems listed in the Gemfile.
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../../Gemfile', __dir__)
+
+require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
+$LOAD_PATH.unshift File.expand_path('../../../lib', __dir__)
diff --git a/actionmailbox/test/dummy/config/cable.yml b/actionmailbox/test/dummy/config/cable.yml
new file mode 100644
index 0000000000..1cd0f8363e
--- /dev/null
+++ b/actionmailbox/test/dummy/config/cable.yml
@@ -0,0 +1,10 @@
+development:
+  adapter: async
+
+test:
+  adapter: async
+
+production:
+  adapter: redis
+  url: <%= ENV.fetch("REDIS_URL") { "redis://localhost:6379/1" } %>
+  channel_prefix: dummy_production
diff --git a/actionmailbox/test/dummy/config/database.yml b/actionmailbox/test/dummy/config/database.yml
new file mode 100644
index 0000000000..0d02f24980
--- /dev/null
+++ b/actionmailbox/test/dummy/config/database.yml
@@ -0,0 +1,25 @@
+# SQLite version 3.x
+#   gem install sqlite3
+#
+#   Ensure the SQLite 3 gem is defined in your Gemfile
+#   gem 'sqlite3'
+#
+default: &default
+  adapter: sqlite3
+  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+  timeout: 5000
+
+development:
+  <<: *default
+  database: db/development.sqlite3
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+test:
+  <<: *default
+  database: db/test.sqlite3
+
+production:
+  <<: *default
+  database: db/production.sqlite3
diff --git a/actionmailbox/test/dummy/config/environment.rb b/actionmailbox/test/dummy/config/environment.rb
new file mode 100644
index 0000000000..426333bb46
--- /dev/null
+++ b/actionmailbox/test/dummy/config/environment.rb
@@ -0,0 +1,5 @@
+# Load the Rails application.
+require_relative 'application'
+
+# Initialize the Rails application.
+Rails.application.initialize!
diff --git a/actionmailbox/test/dummy/config/environments/development.rb b/actionmailbox/test/dummy/config/environments/development.rb
new file mode 100644
index 0000000000..f09b9a00c4
--- /dev/null
+++ b/actionmailbox/test/dummy/config/environments/development.rb
@@ -0,0 +1,63 @@
+Rails.application.configure do
+  # Verifies that versions and hashed value of the package contents in the project's package.json
+  # config.webpacker.check_yarn_integrity = true
+  # Settings specified here will take precedence over those in config/application.rb.
+
+  # In the development environment your application's code is reloaded on
+  # every request. This slows down response time but is perfect for development
+  # since you don't have to restart the web server when you make code changes.
+  config.cache_classes = false
+
+  # Do not eager load code on boot.
+  config.eager_load = false
+
+  # Show full error reports.
+  config.consider_all_requests_local = true
+
+  # Enable/disable caching. By default caching is disabled.
+  # Run rails dev:cache to toggle caching.
+  if Rails.root.join('tmp', 'caching-dev.txt').exist?
+    config.action_controller.perform_caching = true
+
+    config.cache_store = :memory_store
+    config.public_file_server.headers = {
+      'Cache-Control' => "public, max-age=#{2.days.to_i}"
+    }
+  else
+    config.action_controller.perform_caching = false
+
+    config.cache_store = :null_store
+  end
+
+  # Store uploaded files on the local file system (see config/storage.yml for options)
+  config.active_storage.service = :local
+
+  # Don't care if the mailer can't send.
+  config.action_mailer.raise_delivery_errors = false
+
+  config.action_mailer.perform_caching = false
+
+  # Print deprecation notices to the Rails logger.
+  config.active_support.deprecation = :log
+
+  # Raise an error on page load if there are pending migrations.
+  config.active_record.migration_error = :page_load
+
+  # Highlight code that triggered database queries in logs.
+  config.active_record.verbose_query_logs = true
+
+  # Debug mode disables concatenation and preprocessing of assets.
+  # This option may cause significant delays in view rendering with a large
+  # number of complex assets.
+  config.assets.debug = true
+
+  # Suppress logger output for asset requests.
+  config.assets.quiet = true
+
+  # Raises error for missing translations
+  # config.action_view.raise_on_missing_translations = true
+
+  # Use an evented file watcher to asynchronously detect changes in source code,
+  # routes, locales, etc. This feature depends on the listen gem.
+  # config.file_watcher = ActiveSupport::EventedFileUpdateChecker
+end
diff --git a/actionmailbox/test/dummy/config/environments/production.rb b/actionmailbox/test/dummy/config/environments/production.rb
new file mode 100644
index 0000000000..1731582220
--- /dev/null
+++ b/actionmailbox/test/dummy/config/environments/production.rb
@@ -0,0 +1,99 @@
+Rails.application.configure do
+  # Prepare the ingress controller used to receive mail
+  # config.action_mailbox.ingress = :amazon
+
+  # Verifies that versions and hashed value of the package contents in the project's package.json
+    config.webpacker.check_yarn_integrity = false
+  # Settings specified here will take precedence over those in config/application.rb.
+
+  # Code is not reloaded between requests.
+  config.cache_classes = true
+
+  # Eager load code on boot. This eager loads most of Rails and
+  # your application in memory, allowing both threaded web servers
+  # and those relying on copy on write to perform better.
+  # Rake tasks automatically ignore this option for performance.
+  config.eager_load = true
+
+  # Full error reports are disabled and caching is turned on.
+  config.consider_all_requests_local       = false
+  config.action_controller.perform_caching = true
+
+  # Ensures that a master key has been made available in either ENV["RAILS_MASTER_KEY"]
+  # or in config/master.key. This key is used to decrypt credentials (and other encrypted files).
+  # config.require_master_key = true
+
+  # Disable serving static files from the `/public` folder by default since
+  # Apache or NGINX already handles this.
+  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
+
+  # Compress JavaScripts and CSS.
+  config.assets.js_compressor = :uglifier
+  # config.assets.css_compressor = :sass
+
+  # Do not fallback to assets pipeline if a precompiled asset is missed.
+  config.assets.compile = false
+
+  # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb
+
+  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
+  # config.action_controller.asset_host = 'http://assets.example.com'
+
+  # Specifies the header that your server uses for sending files.
+  # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
+  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
+
+  # Store uploaded files on the local file system (see config/storage.yml for options)
+  config.active_storage.service = :local
+
+  # Mount Action Cable outside main process or domain
+  # config.action_cable.mount_path = nil
+  # config.action_cable.url = 'wss://example.com/cable'
+  # config.action_cable.allowed_request_origins = [ 'http://example.com', /http:\/\/example.*/ ]
+
+  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
+  # config.force_ssl = true
+
+  # Use the lowest log level to ensure availability of diagnostic information
+  # when problems arise.
+  config.log_level = :debug
+
+  # Prepend all log lines with the following tags.
+  config.log_tags = [ :request_id ]
+
+  # Use a different cache store in production.
+  # config.cache_store = :mem_cache_store
+
+  # Use a real queuing backend for Active Job (and separate queues per environment)
+  # config.active_job.queue_adapter     = :resque
+  # config.active_job.queue_name_prefix = "dummy_#{Rails.env}"
+
+  config.action_mailer.perform_caching = false
+
+  # Ignore bad email addresses and do not raise email delivery errors.
+  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
+  # config.action_mailer.raise_delivery_errors = false
+
+  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
+  # the I18n.default_locale when a translation cannot be found).
+  config.i18n.fallbacks = true
+
+  # Send deprecation notices to registered listeners.
+  config.active_support.deprecation = :notify
+
+  # Use default logging formatter so that PID and timestamp are not suppressed.
+  config.log_formatter = ::Logger::Formatter.new
+
+  # Use a different logger for distributed setups.
+  # require 'syslog/logger'
+  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
+
+  if ENV["RAILS_LOG_TO_STDOUT"].present?
+    logger           = ActiveSupport::Logger.new(STDOUT)
+    logger.formatter = config.log_formatter
+    config.logger    = ActiveSupport::TaggedLogging.new(logger)
+  end
+
+  # Do not dump schema after migrations.
+  config.active_record.dump_schema_after_migration = false
+end
diff --git a/actionmailbox/test/dummy/config/environments/test.rb b/actionmailbox/test/dummy/config/environments/test.rb
new file mode 100644
index 0000000000..0a38fd3ce9
--- /dev/null
+++ b/actionmailbox/test/dummy/config/environments/test.rb
@@ -0,0 +1,46 @@
+Rails.application.configure do
+  # Settings specified here will take precedence over those in config/application.rb.
+
+  # The test environment is used exclusively to run your application's
+  # test suite. You never need to work with it otherwise. Remember that
+  # your test database is "scratch space" for the test suite and is wiped
+  # and recreated between test runs. Don't rely on the data there!
+  config.cache_classes = true
+
+  # Do not eager load code on boot. This avoids loading your whole application
+  # just for the purpose of running a single test. If you are using a tool that
+  # preloads Rails for running tests, you may have to set it to true.
+  config.eager_load = false
+
+  # Configure public file server for tests with Cache-Control for performance.
+  config.public_file_server.enabled = true
+  config.public_file_server.headers = {
+    'Cache-Control' => "public, max-age=#{1.hour.to_i}"
+  }
+
+  # Show full error reports and disable caching.
+  config.consider_all_requests_local       = true
+  config.action_controller.perform_caching = false
+
+  # Raise exceptions instead of rendering exception templates.
+  config.action_dispatch.show_exceptions = false
+
+  # Disable request forgery protection in test environment.
+  config.action_controller.allow_forgery_protection = false
+
+  # Store uploaded files on the local file system in a temporary directory
+  config.active_storage.service = :test
+
+  config.action_mailer.perform_caching = false
+
+  # Tell Action Mailer not to deliver emails to the real world.
+  # The :test delivery method accumulates sent emails in the
+  # ActionMailer::Base.deliveries array.
+  config.action_mailer.delivery_method = :test
+
+  # Print deprecation notices to the stderr.
+  config.active_support.deprecation = :stderr
+
+  # Raises error for missing translations
+  # config.action_view.raise_on_missing_translations = true
+end
diff --git a/actionmailbox/test/dummy/config/initializers/application_controller_renderer.rb b/actionmailbox/test/dummy/config/initializers/application_controller_renderer.rb
new file mode 100644
index 0000000000..89d2efab2b
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/application_controller_renderer.rb
@@ -0,0 +1,8 @@
+# Be sure to restart your server when you modify this file.
+
+# ActiveSupport::Reloader.to_prepare do
+#   ApplicationController.renderer.defaults.merge!(
+#     http_host: 'example.org',
+#     https: false
+#   )
+# end
diff --git a/actionmailbox/test/dummy/config/initializers/assets.rb b/actionmailbox/test/dummy/config/initializers/assets.rb
new file mode 100644
index 0000000000..4b828e80cb
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/assets.rb
@@ -0,0 +1,14 @@
+# Be sure to restart your server when you modify this file.
+
+# Version of your assets, change this if you want to expire all your assets.
+Rails.application.config.assets.version = '1.0'
+
+# Add additional assets to the asset load path.
+# Rails.application.config.assets.paths << Emoji.images_path
+# Add Yarn node_modules folder to the asset load path.
+Rails.application.config.assets.paths << Rails.root.join('node_modules')
+
+# Precompile additional assets.
+# application.js, application.css, and all non-JS/CSS in the app/assets
+# folder are already added.
+# Rails.application.config.assets.precompile += %w( admin.js admin.css )
diff --git a/actionmailbox/test/dummy/config/initializers/backtrace_silencers.rb b/actionmailbox/test/dummy/config/initializers/backtrace_silencers.rb
new file mode 100644
index 0000000000..59385cdf37
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/backtrace_silencers.rb
@@ -0,0 +1,7 @@
+# Be sure to restart your server when you modify this file.
+
+# You can add backtrace silencers for libraries that you're using but don't wish to see in your backtraces.
+# Rails.backtrace_cleaner.add_silencer { |line| line =~ /my_noisy_library/ }
+
+# You can also remove all the silencers if you're trying to debug a problem that might stem from framework code.
+# Rails.backtrace_cleaner.remove_silencers!
diff --git a/actionmailbox/test/dummy/config/initializers/content_security_policy.rb b/actionmailbox/test/dummy/config/initializers/content_security_policy.rb
new file mode 100644
index 0000000000..edde7f42b8
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/content_security_policy.rb
@@ -0,0 +1,22 @@
+# Be sure to restart your server when you modify this file.
+
+# Define an application-wide content security policy
+# For further information see the following documentation
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
+
+# Rails.application.config.content_security_policy do |policy|
+#   policy.default_src :self, :https
+#   policy.font_src    :self, :https, :data
+#   policy.img_src     :self, :https, :data
+#   policy.object_src  :none
+#   policy.script_src  :self, :https
+#   policy.style_src   :self, :https, :unsafe_inline
+
+#   # Specify URI for violation reports
+#   # policy.report_uri "/csp-violation-report-endpoint"
+# end
+
+# Report CSP violations to a specified URI
+# For further information see the following documentation:
+# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
+# Rails.application.config.content_security_policy_report_only = true
diff --git a/actionmailbox/test/dummy/config/initializers/cookies_serializer.rb b/actionmailbox/test/dummy/config/initializers/cookies_serializer.rb
new file mode 100644
index 0000000000..5a6a32d371
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/cookies_serializer.rb
@@ -0,0 +1,5 @@
+# Be sure to restart your server when you modify this file.
+
+# Specify a serializer for the signed and encrypted cookie jars.
+# Valid options are :json, :marshal, and :hybrid.
+Rails.application.config.action_dispatch.cookies_serializer = :json
diff --git a/actionmailbox/test/dummy/config/initializers/filter_parameter_logging.rb b/actionmailbox/test/dummy/config/initializers/filter_parameter_logging.rb
new file mode 100644
index 0000000000..4a994e1e7b
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/filter_parameter_logging.rb
@@ -0,0 +1,4 @@
+# Be sure to restart your server when you modify this file.
+
+# Configure sensitive parameters which will be filtered from the log file.
+Rails.application.config.filter_parameters += [:password]
diff --git a/actionmailbox/test/dummy/config/initializers/inflections.rb b/actionmailbox/test/dummy/config/initializers/inflections.rb
new file mode 100644
index 0000000000..ac033bf9dc
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/inflections.rb
@@ -0,0 +1,16 @@
+# Be sure to restart your server when you modify this file.
+
+# Add new inflection rules using the following format. Inflections
+# are locale specific, and you may define rules for as many different
+# locales as you wish. All of these examples are active by default:
+# ActiveSupport::Inflector.inflections(:en) do |inflect|
+#   inflect.plural /^(ox)$/i, '\1en'
+#   inflect.singular /^(ox)en/i, '\1'
+#   inflect.irregular 'person', 'people'
+#   inflect.uncountable %w( fish sheep )
+# end
+
+# These inflection rules are supported but not enabled by default:
+# ActiveSupport::Inflector.inflections(:en) do |inflect|
+#   inflect.acronym 'RESTful'
+# end
diff --git a/actionmailbox/test/dummy/config/initializers/mime_types.rb b/actionmailbox/test/dummy/config/initializers/mime_types.rb
new file mode 100644
index 0000000000..dc1899682b
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/mime_types.rb
@@ -0,0 +1,4 @@
+# Be sure to restart your server when you modify this file.
+
+# Add new mime types for use in respond_to blocks:
+# Mime::Type.register "text/richtext", :rtf
diff --git a/actionmailbox/test/dummy/config/initializers/wrap_parameters.rb b/actionmailbox/test/dummy/config/initializers/wrap_parameters.rb
new file mode 100644
index 0000000000..bbfc3961bf
--- /dev/null
+++ b/actionmailbox/test/dummy/config/initializers/wrap_parameters.rb
@@ -0,0 +1,14 @@
+# Be sure to restart your server when you modify this file.
+
+# This file contains settings for ActionController::ParamsWrapper which
+# is enabled by default.
+
+# Enable parameter wrapping for JSON. You can disable this by setting :format to an empty array.
+ActiveSupport.on_load(:action_controller) do
+  wrap_parameters format: [:json]
+end
+
+# To enable root element in JSON for ActiveRecord objects.
+# ActiveSupport.on_load(:active_record) do
+#   self.include_root_in_json = true
+# end
diff --git a/actionmailbox/test/dummy/config/locales/en.yml b/actionmailbox/test/dummy/config/locales/en.yml
new file mode 100644
index 0000000000..decc5a8573
--- /dev/null
+++ b/actionmailbox/test/dummy/config/locales/en.yml
@@ -0,0 +1,33 @@
+# Files in the config/locales directory are used for internationalization
+# and are automatically loaded by Rails. If you want to use locales other
+# than English, add the necessary files in this directory.
+#
+# To use the locales, use `I18n.t`:
+#
+#     I18n.t 'hello'
+#
+# In views, this is aliased to just `t`:
+#
+#     <%= t('hello') %>
+#
+# To use a different locale, set it with `I18n.locale`:
+#
+#     I18n.locale = :es
+#
+# This would use the information in config/locales/es.yml.
+#
+# The following keys must be escaped otherwise they will not be retrieved by
+# the default I18n backend:
+#
+# true, false, on, off, yes, no
+#
+# Instead, surround them with single quotes.
+#
+# en:
+#   'true': 'foo'
+#
+# To learn more, please read the Rails Internationalization guide
+# available at http://guides.rubyonrails.org/i18n.html.
+
+en:
+  hello: "Hello world"
diff --git a/actionmailbox/test/dummy/config/puma.rb b/actionmailbox/test/dummy/config/puma.rb
new file mode 100644
index 0000000000..a5eccf816b
--- /dev/null
+++ b/actionmailbox/test/dummy/config/puma.rb
@@ -0,0 +1,34 @@
+# Puma can serve each request in a thread from an internal thread pool.
+# The `threads` method setting takes two numbers: a minimum and maximum.
+# Any libraries that use thread pools should be configured to match
+# the maximum value specified for Puma. Default is set to 5 threads for minimum
+# and maximum; this matches the default thread size of Active Record.
+#
+threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
+threads threads_count, threads_count
+
+# Specifies the `port` that Puma will listen on to receive requests; default is 3000.
+#
+port        ENV.fetch("PORT") { 3000 }
+
+# Specifies the `environment` that Puma will run in.
+#
+environment ENV.fetch("RAILS_ENV") { "development" }
+
+# Specifies the number of `workers` to boot in clustered mode.
+# Workers are forked webserver processes. If using threads and workers together
+# the concurrency of the application would be max `threads` * `workers`.
+# Workers do not work on JRuby or Windows (both of which do not support
+# processes).
+#
+# workers ENV.fetch("WEB_CONCURRENCY") { 2 }
+
+# Use the `preload_app!` method when specifying a `workers` number.
+# This directive tells Puma to first boot the application and load code
+# before forking the application. This takes advantage of Copy On Write
+# process behavior so workers use less memory.
+#
+# preload_app!
+
+# Allow puma to be restarted by `rails restart` command.
+plugin :tmp_restart
diff --git a/actionmailbox/test/dummy/config/routes.rb b/actionmailbox/test/dummy/config/routes.rb
new file mode 100644
index 0000000000..30b05169b3
--- /dev/null
+++ b/actionmailbox/test/dummy/config/routes.rb
@@ -0,0 +1,4 @@
+Rails.application.routes.draw do
+  resources :messages
+  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
+end
diff --git a/actionmailbox/test/dummy/config/spring.rb b/actionmailbox/test/dummy/config/spring.rb
new file mode 100644
index 0000000000..9fa7863f99
--- /dev/null
+++ b/actionmailbox/test/dummy/config/spring.rb
@@ -0,0 +1,6 @@
+%w[
+  .ruby-version
+  .rbenv-vars
+  tmp/restart.txt
+  tmp/caching-dev.txt
+].each { |path| Spring.watch(path) }
diff --git a/actionmailbox/test/dummy/config/storage.yml b/actionmailbox/test/dummy/config/storage.yml
new file mode 100644
index 0000000000..53e562e0fc
--- /dev/null
+++ b/actionmailbox/test/dummy/config/storage.yml
@@ -0,0 +1,35 @@
+test:
+  service: Disk
+  root: <%= Rails.root.join("tmp/storage") %>
+
+local:
+  service: Disk
+  root: <%= Rails.root.join("storage") %>
+
+# Use rails credentials:edit to set the AWS secrets (as aws:access_key_id|secret_access_key)
+# amazon:
+#   service: S3
+#   access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
+#   secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>
+#   region: us-east-1
+#   bucket: your_own_bucket
+
+# Remember not to checkin your GCS keyfile to a repository
+# google:
+#   service: GCS
+#   project: your_project
+#   credentials: <%= Rails.root.join("path/to/gcs.keyfile") %>
+#   bucket: your_own_bucket
+
+# Use rails credentials:edit to set the Azure Storage secret (as azure_storage:storage_access_key)
+# microsoft:
+#   service: AzureStorage
+#   path: your_azure_storage_path
+#   storage_account_name: your_account_name
+#   storage_access_key: <%= Rails.application.credentials.dig(:azure_storage, :storage_access_key) %>
+#   container: your_container_name
+
+# mirror:
+#   service: Mirror
+#   primary: local
+#   mirrors: [ amazon, google, microsoft ]
diff --git a/actionmailbox/test/dummy/config/webpack/development.js b/actionmailbox/test/dummy/config/webpack/development.js
new file mode 100644
index 0000000000..81269f6513
--- /dev/null
+++ b/actionmailbox/test/dummy/config/webpack/development.js
@@ -0,0 +1,3 @@
+const environment = require('./environment')
+
+module.exports = environment.toWebpackConfig()
diff --git a/actionmailbox/test/dummy/config/webpack/environment.js b/actionmailbox/test/dummy/config/webpack/environment.js
new file mode 100644
index 0000000000..d16d9af743
--- /dev/null
+++ b/actionmailbox/test/dummy/config/webpack/environment.js
@@ -0,0 +1,3 @@
+const { environment } = require('@rails/webpacker')
+
+module.exports = environment
diff --git a/actionmailbox/test/dummy/config/webpack/production.js b/actionmailbox/test/dummy/config/webpack/production.js
new file mode 100644
index 0000000000..81269f6513
--- /dev/null
+++ b/actionmailbox/test/dummy/config/webpack/production.js
@@ -0,0 +1,3 @@
+const environment = require('./environment')
+
+module.exports = environment.toWebpackConfig()
diff --git a/actionmailbox/test/dummy/config/webpack/test.js b/actionmailbox/test/dummy/config/webpack/test.js
new file mode 100644
index 0000000000..81269f6513
--- /dev/null
+++ b/actionmailbox/test/dummy/config/webpack/test.js
@@ -0,0 +1,3 @@
+const environment = require('./environment')
+
+module.exports = environment.toWebpackConfig()
diff --git a/actionmailbox/test/dummy/config/webpacker.yml b/actionmailbox/test/dummy/config/webpacker.yml
new file mode 100644
index 0000000000..d3f24e1b4b
--- /dev/null
+++ b/actionmailbox/test/dummy/config/webpacker.yml
@@ -0,0 +1,65 @@
+# Note: You must restart bin/webpack-dev-server for changes to take effect
+
+default: &default
+  source_path: app/javascript
+  source_entry_path: packs
+  public_output_path: packs
+  cache_path: tmp/cache/webpacker
+
+  # Additional paths webpack should lookup modules
+  # ['app/assets', 'engine/foo/app/assets']
+  resolved_paths: []
+
+  # Reload manifest.json on all requests so we reload latest compiled packs
+  cache_manifest: false
+
+  extensions:
+    - .js
+    - .sass
+    - .scss
+    - .css
+    - .png
+    - .svg
+    - .gif
+    - .jpeg
+    - .jpg
+
+development:
+  <<: *default
+  compile: true
+
+  # Reference: https://webpack.js.org/configuration/dev-server/
+  dev_server:
+    https: false
+    host: localhost
+    port: 3035
+    public: localhost:3035
+    hmr: false
+    # Inline should be set to true if using HMR
+    inline: true
+    overlay: true
+    compress: true
+    disable_host_check: true
+    use_local_ip: false
+    quiet: false
+    headers:
+      'Access-Control-Allow-Origin': '*'
+    watch_options:
+      ignored: /node_modules/
+
+
+test:
+  <<: *default
+  compile: true
+
+  # Compile test packs to a separate directory
+  public_output_path: packs-test
+
+production:
+  <<: *default
+
+  # Production depends on precompilation of packs prior to booting for performance.
+  compile: false
+
+  # Cache manifest.json for performance
+  cache_manifest: true