person-sandi-metz
blog-post-3-days-with-sandi-metz
book-99-bottles-of-oop
book-poodr
mocks-vs-stubs
testing-concept-private-method-testing
testing-concept-red-green-refactor
testing-concept-testing-as-spiking
tweet-duplicate-all-of-the-code
tweet-incidental-duplication