You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: slack_notifier.rb
    path of file: ./repos/forem/config/initializers
    
    the code of the file until where you have to start completion: Rails.application.config.to_prepare do
  Rails.root.glob("lib/slack/notifier/util/*.rb").each do |filename|
    require_dependency filename
  end
end

class NoOpHTTPClient
 
    
  def self.init_slack_client
    default_options = if Rails.env.production?
                        {
                          channel: ApplicationConfig["SLACK_CHANNEL"],
                          username: "activity_bot"
                        }
                      elsif Rails.env.test?
                        {
                          channel: "#test",
                          username: "development_test_bot"
                        }
                      end