Rails WSL2(Ubuntu)でのRSpec実行エラー

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

Ruby
1「Gemfile」
2source 'https://rubygems.org'
3git_source(:github) { |repo| "https://github.com/#{repo}.git" }
4
5ruby '2.5.1'
6
7# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
8gem 'rails', '~> 5.2.4', '>= 5.2.4.3'
9# Use postgresql as the database for Active Record
10gem 'pg', '>= 0.18', '< 2.0'
11# Use Puma as the app server
12gem 'puma', '~> 3.11'
13# Use SCSS for stylesheets
14gem 'sass-rails', '~> 5.0'
15# Use Uglifier as compressor for JavaScript assets
16gem 'uglifier', '>= 1.3.0'
17# See https://github.com/rails/execjs#readme for more supported runtimes
18# gem 'mini_racer', platforms: :ruby
19
20# Use CoffeeScript for .coffee assets and views
21gem 'coffee-rails', '~> 4.2'
22# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
23gem 'turbolinks', '~> 5'
24# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
25gem 'jbuilder', '~> 2.5'
26# Use Redis adapter to run Action Cable in production
27# gem 'redis', '~> 4.0'
28# Use ActiveModel has_secure_password
29gem 'bcrypt', '~> 3.1.7'
3043   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
31gem 'rails_autolink'
32
33# Use ActiveStorage variant
34# gem 'mini_magick', '~> 4.8'
35
36# Use Capistrano for deployment
37# gem 'capistrano-rails', group: :development
38
39# Reduces boot times through caching; required in config/boot.rb
40gem 'bootsnap', '>= 1.1.0', require: false
41
42group :development, :test do
43  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
44  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
45  gem 'rspec-rails', '~> 3.7'
46  gem 'factory_bot_rails', '~> 4.11'
47end
48
49group :development do
50  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
51  gem 'web-console', '>= 3.3.0'
52  gem 'listen', '>= 3.0.5', '< 3.2'
53end
54
55group :test do
56  # Adds support for Capybara system testing and selenium driver
57  gem 'capybara'#, '>= 2.15'
58  gem 'selenium-webdriver'
59  # Easy installation and use of chromedriver to run system tests with Chrome
60  #gem 'chromedriver-helper'
61  gem 'webdrivers'
62  #gem 'webdrivers', '~> 4.0'
63end
64
65# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
66gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
67
68gem 'slim-rails'
69gem 'html2slim'
70
71gem 'bootstrap'

Ruby
1「spec_helper.rb」
2require 'capybara/rspec'
3
4#Selenium::WebDriver::Chrome.driver_path = "/mnt/c/Program Files/chromedriver_win32/chromedriver.exe"
5
6RSpec.configure do |config|
7  config.before(:each, type: :system) do
8    driven_by :selenium_chrome_headless
9  end
10
11  config.expect_with :rspec do |expectations|
12    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
13  end
14
15  config.mock_with :rspec do |mocks|
16    mocks.verify_partial_doubles = true
17  end
18
19  config.shared_context_metadata_behavior = :apply_to_host_groups
20
21end

Ruby
1「tasks_spec.rb」
2require 'rails_helper'
3
4describe 'タスク管理機能', type: :system do
5  describe '一覧表示機能' do
6    before do
7      # ユーザAを作成しておく
8      user_a = FactoryBot.create(:user, name: 'ユーザA', email: 'a@example.com')
9      # 作成者がユーザAであるタスクを作成しておく
10      FactoryBot.create(:task, name: '最初のタスク', user: user_a)
11    end
12
13    context 'ユーザAがログインしているとき' do
14      before do
15        # ユーザAでログインする
16        visit login_path
17        #fill_in 'メールアドレス', with: 'a@example.com'
18        #fill_in 'パスワード', with: 'password'
19        #click_button 'ログインする'
20      end
21
22      it 'ユーザAが作成したタスクが表示される' do
23        # 作成済みのタスクの名称が画面上に表示されていることを確認
24        #expect(page).to have_content '最初のタスク'
25      end
26    end
27  end
28end
29