Introduction to Rails testing with RSpec and Capybara

I didn’t understand the importance of testing and used to think writing test was an extra effort (my app already work well when I wrote it, why should I spend extra time to write test for it?), boy I was so wrong 😅.Now I work in an enterprise handling thousands of transaction per day, I would be very afraid to deploy new update if there wasn’t a solid test suite, without a test suite, I could have broke the payment system on a new deploy, which could cost the companies a lot of $$$ 💸 ! This is why many companies with good engineering practice would require job candidate to possess skill on writing automated test.