3 korrents from this piece
Every claim below was made in this piece, quoted word for word and numbered in the order the piece makes them, so you can read it there rather than take our word for it. The sentence above each quote is our reading of the claim, not their wording. Each quote was checked against a stored copy of the page at build time; where the two differ, the quote is the fact.
Their wordsI still believe that unit testing should be nothing more than "tell me if something unexpected happened."
Their wordsThe popularity feeds the tooling, and the tooling feeds the popularity. That's not a technical argument-it's a network effect.
Our reading
Needing to mock code in tests often signals an underlying design problem that refactoring would fix.
Their wordsunless the code is completely out of your control, the need for mocking often indicates a design problem-consider refactoring to make the code easier to test directly.