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24/ "Working normally" isn't such a big deal for Stdout, because there's no real logic or behavior there, but it is a big deal for your higher-level code that does have logic. For example, a Terminal that uses Stdout and has the ability to draw boxes that are exactly the width of the terminal.

(I dunno. It's hard coming with examples. This is all off the cuff. See the article for actual source code examples with more than 10 seconds of thought in them: https://www.jamesshore.com/v2/projects/testing-without-mocks/testing-without-mocks)