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: rails_test.rb
    path of file: ./repos/retest/test/retest/command
    
    the code of the file until where you have to start completion: require 'test_helper'
require_relative 'command_interface'

module Retest
  class Command
    class RailsTest < MiniTest::Test
      def setup
        @subject = Rails.new(all: true, file_system: FakeFS.new([]))
      end

      include CommandInterface

      def test_to_s
        assert_equal 'bin/rails test',                Rails.new(all: true, file_system: FakeFS.new(['bin/rails'])).to_s
        assert_equal 'bundle exec rails test',        Rails.new(all: true, file_system: FakeFS.new([])).to_s
        assert_equal 'bin/rails test <test>',         Rails.new(all: false, file_system: FakeFS.new(['bin/rails'])).to_s
        assert_equal 'bundle exec rails test <test>', Rails.new(all: false, file_system: FakeFS.new([])).to_s
        # take into account gem repository which doesn't have a bin file
        assert_equal 'bundle exec rails te
    
      def test_to_s
        assert_equal 'bin/rails test',                Rails.new(all: true, file_system: FakeFS.new(['bin/rails'])).to_s
        assert_equal 'bundle exec rails test',        Rails.new(all: true, file_system: FakeFS.new([])).to_s
        assert_equal 'bin/rails test <test>',         Rails.new(all: false, file_system: FakeFS.new(['bin/rails'])).to_s
        assert_equal 'bundle exec rails test <test>', Rails.new(all: false, file_system: FakeFS.new([])).to_s
        # take into account gem repository which doesn't have a bin file
        assert_equal 'bundle exec rails test <test>', Rails.new(all: false).to_s
        assert_equal 'bundle exec rails test',        Rails.new(all: true).to_s
      end

      def test_format_with_one_file
        assert_equal 'a/file/path.rb', @subject.format_batch('a/file/path.rb')
      end

      def test_format_with_multiple_files
        assert_equal 'a/file/path.rb another/file/path.rb', @subject.format_batch('a/file/path.rb', 'another/file/path.rb')
      end
    end