Acceptance tests are tests from the perspective of the end user.
It means that we are simulating what a user could do from their web browser and testing the expected behavior of the app.
Acceptance tests can be found in the directory
spec/system (in Rails terminology these are called "system tests").
You can run all acceptance tests with:
bundle exec rspec spec/system
To run an individual file you can use for example:
bundle exec rspec spec/system/user_views_a_reading_list_spec.rb
To run a specific test case you can use for example:
bundle exec rspec spec/system/user_views_a_reading_list_spec.rb:10
10 is the line number of the test case you want to execute.
You can read the official guide Testing Rails Applications to learn more.