Guide to setup RSpec 4 in your Rails 6 application

rspec_rails_setup.rb

# Spin up a new rails application and make sure your database and schema is created
rails new example-app -T -d postgresql

# Add and install the following gems to your Gemfile
group :development, :test do
  ...
  gem 'rspec-rails'
  gem 'capybara'
  gem 'selenium-webdriver'
end

# Run Rspec generator
rails g rspec:install

# Require the rspec rails and capybara at the top of the rails_helper.rb file
require 'rspec/rails'
require 'capybara/rspec'

# Create your spec files under the respective spec folders
spec/controllers/posts_controller.rb
spec/system/user_create_post.rb

# Run your spec files and watch them fail
rspec spec/system/user_create_post.rb