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: revert_spec.rb
    path of file: ./repos/scenic/spec/integration
    
    the code of the file until where you have to start completion: require "spec_helper"

describe "Reverting scenic schema statements", :db do
 
    
  def migration_for_update
    Class.new(migration_class) do
      def change
        update_view :greetings, version: 2, revert_to_version: 1
      end
    end
  end