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_regexp.rb
    path of file: ./repos/truffleruby/test/mri/tests/ruby
    
    the code of the file until where you have to start completion: # coding: US-ASCII
# frozen_string_literal: false
require 'test/unit'

class TestRegexp < Test::Unit::TestCase
  def setup
    @verbose = $VERBOSE
  end

  def teardown
    $VERBOSE = @verbose
  end

  def test_has_NOENCODING
    as
    
  def assert_match_at(re, str, positions, msg = nil)
    re = Regexp.new(re) unless re.is_a?(Regexp)

    match = re.match(str)

    assert_not_nil match, message(msg) {
      "Expected #{re.inspect} to match #{str.inspect}"
    }

    if match
      actual_positions = (0...match.size).map { |i|
        [match.begin(i), match.end(i)]
      }

      assert_equal positions, actual_positions, message(msg) {
        "Expected #{re.inspect} to match #{str.inspect} at: #{positions.inspect}"
      }
    end