system_specで Launchy::CommandNotFoundError: Unable to find a browser command.が発生する

Question

Docker + Rails(RSpec)でアプリを作成しています。

docker + system_spec の 記事をいくつか見ていた中で
Rails on DockerでRSpecのSystem testをSelenium Dockerを使ってやってみた。 - Qiita
がわかりやすそうなので、参考にしながらテストを書いていますが、

• save_and_open_pageを使う
• js: trueオプションを付加する

時にテストがパスしません(上記2つを使わないとテストはパスします)。

Ruby rspec VCR でVCR::Errors::UnhandledHTTPRequestError が... - Qiita

といった記事があったので内容を見てみましたが、関係ないような気がします(m_ m)
もしわかる方がいらっしゃればご教授いただきますようよろしくお願いいたします(m _m)

動作環境

Ruby: 2.5.7
Rails: 5.1.7
rspec-rails: 4.0.1
capybara: 3.32.2
Docker for Mac: 2.2.0.5

エラー内容(2)

• 下記のコードではLaunchy::CommandNotFoundError:が発生する

require 'rails_helper'

RSpec.describe "sample test", type: :system do
  it 'xxx' do
    save_and_open_page
    visit root_path
  end
end

Failure/Error: save_and_open_page
Launchy::CommandNotFoundError:
  Unable to find a browser command.
  If this is unexpected, Please rerun with environment variable LAUNCHY_DEBUG=true or the '-d' commandline option
  and file a bug at https://github.com/copiousfreetime/launchy/issues/new

• js: trueオプションを付加すると下記のエラーが発生する。save_and_open_pageをコメントアウトしてもFailure/Error:の対象が変わるだけ(長い)

require 'rails_helper'

RSpec.describe "sample test", type: :system, js: true do
  it 'xxx' do
    save_and_open_page
    visit root_path
  end
end

sample test
  xxx (FAILED - 1)

Failures:

  1) sample test xxx
     Got 0 failures and 2 other errors:

     1.1) Failure/Error: save_and_open_page

          VCR::Errors::UnhandledHTTPRequestError:


            ================================================================================
            An HTTP request has been made that VCR does not know how to handle:
              POST http://chrome:4444/wd/hub/session

            There is currently no cassette in use. There are a few ways
            you can configure VCR to handle this request:

              * If you're surprised VCR is raising this error
                and want insight about how VCR attempted to handle the request,
                you can use the debug_logger configuration option to log more details [1].
              * If you want VCR to record this request and play it back during future test
                runs, you should wrap your test (or this portion of your test) in a
                `VCR.use_cassette` block [2].
              * If you only want VCR to handle requests made while a cassette is in use,
                configure `allow_http_connections_when_no_cassette = true`. VCR will
                ignore this request since it is made when there is no cassette [3].
              * If you want VCR to ignore this request (and others like it), you can
                set an `ignore_request` callback [4].

            [1] https://www.relishapp.com/vcr/vcr/v/5-1-0/docs/configuration/debug-logging
            [2] https://www.relishapp.com/vcr/vcr/v/5-1-0/docs/getting-started
            [3] https://www.relishapp.com/vcr/vcr/v/5-1-0/docs/configuration/allow-http-connections-when-no-cassette
            [4] https://www.relishapp.com/vcr/vcr/v/5-1-0/docs/configuration/ignore-request
            ================================================================================
:
省略(収まりきらない)
:


     1.2) Failure/Error: raise VCR::Errors::UnhandledHTTPRequestError.new(vcr_request)

          VCR::Errors::UnhandledHTTPRequestError:


            ================================================================================
            An HTTP request has been made that VCR does not know how to handle:
              POST http://chrome:4444/wd/hub/session

            There is currently no cassette in use. There are a few ways
            you can configure VCR to handle this request:

              * If you're surprised VCR is raising this error
                and want insight about how VCR attempted to handle the request,
:
省略(収まりきらない)
:

期待する動作

• save_and_open_page を実行、スクリーンショットが保存されるようになること
• js: trueオプションを付加してもテストがパスするようになること
• ブラウザ操作を視認で確認できるようになること

試したこと

• Rails on DockerでRSpecのSystem testをSelenium Dockerを使ってやってみた。 - Qiita
• DockerでRSpecのブラウザ操作を見る | Futurismo

を参考にファイルを作成後
docker-compse run -e LAUNCH_BROWSER=true web rspec spec/system/sample_spec.rbを実行しました

該当しそうなコード6つ

• Gemfile(1 / 6)

source 'https://rubygems.org'

git_source(:github) do |repo_name|
  repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
  "https://github.com/#{repo_name}.git"
end
:
:

group :development, :test do
  gem 'awesome_print'
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'factory_bot_rails'
  gem 'rspec-rails'
  gem 'rails-flog', require: 'flog'

end

group :development do
  gem 'bullet'
  gem 'pry-byebug'
  gem 'pry-rails'
  gem 'letter_opener_web'
  gem 'listen', '>= 3.0.5', '< 3.2'
  gem 'rubocop', require: false
  gem 'rubocop-performance'
  gem 'rubocop-rails', require: false
  gem 'rubocop-rspec', require: false
  gem 'solargraph'
  gem 'spring'
  gem 'spring-commands-rspec'
  gem 'spring-watcher-listen', '~> 2.0.0'
  gem 'web-console', '>= 3.3.0'
end

group :test do
  gem 'capybara'
  gem 'launchy'
  gem 'shoulda-matchers',
      git: 'https://github.com/thoughtbot/shoulda-matchers.git',
      branch: 'rails-5'
  gem 'simplecov'
  gem 'vcr'
  gem 'webdrivers'
  gem 'webmock'
  gem 'database_cleaner'
  gem 'selenium-webdriver'
  # gem 'chromedriver-helper'
end

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

• docker-compose.yml(2 / 6)

# docker-compose.yml
version: '3.7'

services:
  db:
    image: mysql:5.7
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: root
    ports:
        - "4306:3306"
    volumes:
        - db-data:/var/lib/mysql
  web:
    init: true
    tty: true
    stdin_open: true
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    #
    volumes:
      - .:/webapp
    ports:
      - "3000:3000"
    #
    links:
      - db
      - chrome
  chrome:
    # image: selenium/standalone-chrome:latest
    # 視認で確認する
    image: selenium/standalone-chrome-debug:latest
    ports:
      - 4444:4444
      # 視認で確認する
      - 5901:5900

volumes:
  db-data:

• rails_helper.rb(3 / 6)

require 'spec_helper'
ENV['RAILS_ENV'] ||= 'test'
require File.expand_path('../config/environment', __dir__)
abort('The Rails environment is running in production mode!') if Rails.env.production?

require 'simplecov'
require 'capybara/rspec'
require 'selenium-webdriver'
require 'factory_bot'
require 'shoulda-matchers'
require 'vcr'
require 'spec_helper'
require 'rspec/rails'

Dir[Rails.root.join('spec', 'support', '**', '*.rb')].sort.each { |f| require f }

begin
  ActiveRecord::Migration.maintain_test_schema!
rescue ActiveRecord::PendingMigrationError => e
  puts e.to_s.strip
  exit 1
end
RSpec.configure do |config|
  config.fixture_path = "#{::Rails.root}/spec/fixtures"
  config.use_transactional_fixtures = false
  config.infer_spec_type_from_file_location!
  config.filter_rails_from_backtrace!

  config.before(:suite) do
    DatabaseCleaner.strategy = :transaction
    DatabaseCleaner.clean_with(:truncation)
  end

  config.include Devise::Test::IntegrationHelpers, type: :system
end

• spec_helper.rb(4 / 6)

require 'simplecov'
SimpleCov.start 'rails'

RSpec.configure do |config|
  config.filter_run focus: true
  config.run_all_when_everything_filtered = true
  config.expect_with :rspec do |expectations|
    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
  end

  config.mock_with :rspec do |mocks|
    mocks.verify_partial_doubles = true
  end

  config.shared_context_metadata_behavior = :apply_to_host_groups
end

• capybara.rb(5 / 6)

require 'capybara/rspec'
require 'selenium-webdriver'
require 'vcr'

Capybara.register_driver :remote_chrome do |app|
  url = "http://chrome:4444/wd/hub"
  caps = ::Selenium::WebDriver::Remote::Capabilities.chrome(
    "goog:chromeOptions" => {
      "args" => [
        "no-sandbox",
        # "headless",
        "disable-gpu",
        "window-size=1680,1050"
      ]
    }
  )
  Capybara::Selenium::Driver.new(app, browser: :remote, url: url, desired_capabilities: caps)
end

RSpec.configure do |config|
  config.before(:each, type: :system) do
    driven_by :rack_test
  end

  config.before(:each, type: :system, js: true) do
    driven_by :remote_chrome
    Capybara.server_host = IPSocket.getaddress(Socket.gethostname)
    Capybara.server_port = 3000
    Capybara.app_host = "http://#{Capybara.server_host}:#{Capybara.server_port}"
  end
  # ~~~
end

• スペックファイル(6 / 6)

# spec/system/sample_spec.rb
require 'rails_helper'

RSpec.describe "sample test", type: :system, js: true do
  it 'xxx' do
    save_and_open_page
    visit root_path
  end
end