Setting up automatic testing for a Ruby on Rails and Vue.js app using RSpec and Jest is an important step in ensuring the quality of your code. To do this, you need to run the command rspec spec && jest __tests. This command will run both RSpec and Jest tests on your application. It is important to note that you should always run both tests together, as they are complementary and provide different types of feedback. Additionally, you should make sure that your code is properly formatted and follows best practices for both Ruby on Rails and Vue.js. You can find more information about setting up automatic testing for a Ruby on Rails and Vue.js app using RSpec and Jest on this website.