Rspecで requestテストがうまく通らない

Rspecで、リクエストのテストを書こうと思っています。
expect(response).to have_http_status "200"
で確認できると思うのですが、実行してみると、
expected the response to have status code 200 but it was nil
として帰ってきてしまいます。
expect(response.status).to eq(200)
こちらのコードでも試してみたのですが、NoMethodErrorになってしまいました。

バージョンなど

ruby 2.6.2
rails 5.2.3
docker 19.03.4

#####　エラー内容

Starting open-close_db_1 ... done
/usr/local/bin/ruby -I/usr/local/bundle/gems/rspec-core-3.9.0/lib:/usr/local/bundle/gems/rspec-support-3.9.0/lib /usr/local/bundle/gems/rspec-core-3.9.0/exe/rspec --pattern spec/**\{,/*/**\}/*_spec.rb
2019-11-19 01:39:30 WARN Selenium [DEPRECATION] Selenium::WebDriver::Chrome#driver_path= is deprecated. Use Selenium::WebDriver::Chrome::Service#driver_path= instead.
FF

Failures:

  1) Homes root_pathにアクセスすると 200レスポンスが帰ってくること 1
     Failure/Error: expect(response).to have_http_status "200"
       expected the response to have status code 200 but it was nil
     # ./spec/requests/homes_spec.rb:7:in `block (3 levels) in <top (required)>'

  2) Homes root_pathにアクセスすると 200レスポンスが帰ってくること 2
     Failure/Error: expect(response.status).to eq(200)

     NoMethodError:
       undefined method `status' for nil:NilClass
     # ./spec/requests/homes_spec.rb:11:in `block (3 levels) in <top (required)>'

Finished in 0.70259 seconds (files took 4.57 seconds to load)
2 examples, 2 failures

Failed examples:

rspec ./spec/requests/homes_spec.rb:5 # Homes root_pathにアクセスすると 200レスポンスが帰ってくること 1
rspec ./spec/requests/homes_spec.rb:9 # Homes root_pathにアクセスすると 200レスポンスが帰ってくること 2

/usr/local/bin/ruby -I/usr/local/bundle/gems/rspec-core-3.9.0/lib:/usr/local/bundle/gems/rspec-support-3.9.0/lib /usr/local/bundle/gems/rspec-core-3.9.0/exe/rspec --pattern spec/**\{,/*/**\}/*_spec.rb failed

コード

spec/requests/home_spec.rb

require 'rails_helper'

RSpec.describe "Homes", type: :request do
  describe "root_pathにアクセスすると" do
    it "200レスポンスが帰ってくること 1" do
      visit root_path
      expect(response).to have_http_status "200"
    end
    it "200レスポンスが帰ってくること 2" do
      visit root_path
      expect(response.status).to eq(200)
    end
  end
end

spec/rails_helper

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 'rspec/rails'

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 = true
  config.infer_spec_type_from_file_location!
  config.filter_rails_from_backtrace!
  config.include Capybara::DSL
end

spec/spec_helper.rb

require 'capybara/rspec'

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

docker-compose.yml

version: '3'
services:
  db:
    image: postgres
    volumes:
      - ./tmp/db:/var/lib/postgresql/data
  web:
    build: .
    command: bash -c "rm -f tmp/pids/server.pid && bundle exec rails s -p 3000 -b '0.0.0.0'"
    volumes:
      - .:/myapp
    ports:
      - "3000:3000"
    depends_on:
      - db
  chrome:
    image: selenium/standalone-chrome:3.141.59-dubnium
    ports:
      - 4444:4444

Dockerfile

FROM ruby:2.6.2
RUN apt-get update -qq && \
    apt-get install -y nodejs postgresql-client && \
    apt-get install -y vim
RUN mkdir /myapp
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
COPY . /myapp

# Add a script to be executed every time the container starts.
COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000

# Start the main process.
CMD ["rails", "server", "-b", "0.0.0.0"]

gemfile

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

ruby '2.6.2'
gem 'rails', '~> 5.2.3'
gem 'pg', '>= 0.18', '< 2.0'
gem 'puma', '~> 3.11'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.2'
gem 'turbolinks', '~> 5'
gem 'jbuilder', '~> 2.5'
gem 'bootsnap', '>= 1.1.0', require: false

group :development, :test do
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
  gem 'rspec-rails'
  gem 'factory_bot_rails'
end

group :test do
  gem 'capybara', '>= 2.15'
  gem 'selenium-webdriver'
  gem 'chromedriver-helper'
end

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

gem 'devise'
gem 'omniauth-facebook'
gem 'html2slim'
gem 'slim-rails', '3.1.3'

#####　試したこと
expect(page).to have_content
で、該当のページの文章が存在するかテストしてみたところ、うまく行きました。