前提・実現したいこと

「現場で使えるRuby on Rails5 速習実践ガイド」で学習しており、

5章でRSpecのsystem spec実行でエラーが発生しました。

エラーが発生したコマンド

「bundle exec rspec spec/system/tasks_spec.rb」

発生している問題・エラーメッセージ

Capybara starting Puma...
* Version 3.12.6 , codename: Llamas in Pajamas
* Min threads: 0, max threads: 4
* Listening on tcp://127.0.0.1:42299
F

Failures:

  1) タスク管理機能 一覧表示機能 ユーザAがログインしているとき ユーザAが作成したタスクが表示される
     Got 0 failures and 2 other errors:

     1.1) Failure/Error: visit login_path

          NotImplementedError:
            fork() function is unimplemented on this machine

          # ./spec/system/tasks_spec.rb:15:in `block (4 levels) in <top (required)>'

     1.2) Failure/Error:
                    @pid = Kernel.fork {
                      # Children of the forked process will inherit its process group
                      # This is to make sure that all grandchildren dies when this Process instance is killed
                      ::Process.setpgid 0, 0 if leader?

                      if @cwd
                        Dir.chdir(@cwd)
                      end

                      exec_r.close

          NotImplementedError:
            fork() function is unimplemented on this machine

該当のソースコード

「Gemfile」
source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.5.1'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.4', '>= 5.2.4.3'
# Use postgresql as the database for Active Record
gem 'pg', '>= 0.18', '< 2.0'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby

# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
gem 'bcrypt', '~> 3.1.7'
43   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
gem 'rails_autolink'

# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.1.0', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'rspec-rails', '~> 3.7'
  gem 'factory_bot_rails', '~> 4.11'
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara'#, '>= 2.15'
  gem 'selenium-webdriver'
  # Easy installation and use of chromedriver to run system tests with Chrome
  #gem 'chromedriver-helper'
  gem 'webdrivers'
  #gem 'webdrivers', '~> 4.0'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

gem 'slim-rails'
gem 'html2slim'

gem 'bootstrap'

#ubuntu #wsl2