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: test_emoji_breaks.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/ruby/enc
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
# Copyright © 2018 Mart
    
  def test_single_emoji
    all_tests.each do |test|
      expected = [test.string]
      actual = test.string.each_grapheme_cluster.to_a
      assert_equal expected, actual,
        "file: #{test.filename}, line #{test.line_number}, " +
        "type: #{test.type}, shortname: #{test.shortname}, comment: #{test.comment}"
    end
  end