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_image.rb
    path of file: ./repos/gosu/test
    
    the code of the file until where you have to start completion: require_relative "test_helper"

class TestImage < Minitest::Test
  include TestHelper
  
  private def cir
    
  def test_image_insert
    canvas = Gosu::Image.from_blob(3000, 2000)
    stamp = rect_image(1337, 1337)
    8.times do |i|
      canvas.insert stamp, i * 300, i * 123
    end
    assert_image_matches "test_image/insert", canvas, 1.00
  end