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: backup_spec.rb
    path of file: ./repos/parity/spec/parity
    
    the code of the file until where you have to start completion: require File.join(File.dirname(__FILE__), '..', '..', 'lib', 'parity')

describe Parity::Backup do
  cont
    
  def create_heroku_ext_schema_command(db_name: default_db_name)
    <<~SHELL
      psql #{db_name} -c "
        CREATE SCHEMA IF NOT EXISTS heroku_ext;
      "
    SHELL
  end