Capybara - RSpecs

https://devhints.io/capybara

https://rubydoc.info/github/jnicklas/capybara/Capybara/RSpecMatchers

https://www.rubydoc.info/github/jnicklas/capybara/master/Capybara/Node/Matchers

https://guides.rubyonrails.org/testing.html#system-testing