My three favorites are: 1. Obey The Testing Goat (Python, [0]), 2. Test Driven Laravel (PHP/Laravel, $$$, [1]), 3. the RSpec book (used for ~5$, or the new one [2])

[0] https://www.obeythetestinggoat.com/pages/book.html#toc [1] https://course.testdrivenlaravel.com/ [2] https://pragprog.com/book/rspec3/effective-testing-with-rspec-3