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It is a pretty long chapter, full of valuable knowledge and some key considerations, e.g. regarding a number of tests, preventing combinatorial explosion and mocks in general.
Although it reads rather easily, it feels long. While reading the previous chapter, I didn't have that impression.
I guess it's mostly because of finishing up functional tests. I have a feeling the chapter could put a hard stop when we realised the first functional test passes.
Apart from that, a potentially outdated part about possible typos in mock methods caught my eye. This definitely needs consideration.