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I didn't say that the book's approach contradicted TDD, I'm merely quoting from the book and refuting one its claims (that TDD doesn't lead to good design). I agree that narrow and deep modules support refactoring internals if their unit tests are written to treat them as black boxes.

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TDD in classical form (understood by most devs) aka "one test per function/method" leads to poor design indeed. There is a little training about why this approach couples code with tests and what to do instead.

Yes, that would make for both terrible design and terrible tests.

I think sometimes people refuse to go past the words naming a practice or past the tldr; and it causes problems.

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