Hi, please forgive the self-promotion, but I wanted to share that I've begun rolling out updates to my book, Everyday Rails Testing with RSpec. It's a serious rewrite, accounting for RSpec 3.6, Rails 5.1, and how my approach to testing has evolved over the last few years. You may find it to be a nice companion to Myron's new book. Mine's not as comprehensive, but focuses more on what rspec-rails gives you, and on the tools I use most—the 20% of RSpec and friends that I use 80% of the time.
It's a free update if you already own a copy, and of course I won't turn down any new readers :)
Thanks,
Aaron