class ReactOnRails::TestHelper::EnsureAssetsCompiled

def call

the generated bundles.
3. For whatever reason, the watch processes are running, but some clean script removed
2. Only webpack watch process for server bundle as we're the hot reloading setup.
1. No webpack watch processes for static assets and files are missing or out of date.
Several Scenarios: 
def call
  # Only check this ONCE during a test run
  return if self.class.has_been_run
  # Be sure we don't do this again.
  self.class.has_been_run = true
  ReactOnRails::Locales.compile
  stale_gen_files = webpack_assets_status_checker.stale_generated_webpack_files
  # All done if no stale files!
  return if stale_gen_files.empty?
  ReactOnRails::PacksGenerator.instance.generate_packs_if_stale if ReactOnRails.configuration.auto_load_bundle
  # Inform the developer that we're ensuring gen assets are ready.
  puts_start_compile_check_message(stale_gen_files)
  webpack_assets_compiler.compile_assets
end

def initialize(webpack_assets_status_checker: nil, 

def initialize(webpack_assets_status_checker: nil,
               webpack_assets_compiler: nil)
  @webpack_assets_status_checker = webpack_assets_status_checker
  @webpack_assets_compiler = webpack_assets_compiler
end

def puts_start_compile_check_message(stale_files) 

def puts_start_compile_check_message(stale_files)
  puts <<~MSG
    Detected the following stale generated files:
      #{stale_files.join("\n  ")}
    React on Rails will ensure your JavaScript generated files are up to date, using your
    `#{ReactOnRails::Utils.prepend_cd_node_modules_directory(ReactOnRails.configuration.build_test_command)}` command.
  MSG
end