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(Post) Preview (/login) 10 (/~matklad) (matklad avatar) (/~matklad) matklad edited (/c/prrpxf) (2025-08-02 03:14:11 -0500) 17 hours ago This is surprisingly reasonable despite using unit/integration dichotomy! Though, I continue to maintain that the most important insight about testing is that there are two independent axes here: how much IO is done by test (none > some FS access > some IPC > some HTTP to a different machine) which fraction of your codebase is exercised by the test (single function without dependencies > the entire thing) (https://testing.googleblog.com/2010/12/test-sizes.html?m=1) https://testing.googleblog.com/2010/12/test-sizes.html?m=1 There\u2019s also third axes, whether we are testing a single unit of behavior, or a more complicated composite flow, but it is of the least consequences for writing tests. EDIT: worth pointing out how the article (and I presume the book) avoids the usual confusion: it re-defines the meaning of unit! It uses neither the original meaning (unit is the test itself , (https://web.archive.org/web/20150315073817/http://www.xprogramming.com/testfram.htm#:~:text=unit%20of%20testing) unit of testing , as a encoding of a defined part of a manual testing process in a repl), nor the acquired meaning (unit as a (https://en.wikipedia.org/wiki/Unit_testing) component or module ), and instead conveniently defines it as \u201cunit of behavior\u201d. There\u2019s some deep truth in here about naming things! (/login) (/~facundoolano) (facundoolano avatar) (/~facundoolano) facundoolano (/c/stp6gm) (2025-08-02 19:15:13 -0500) 1 hour ago That definition of unit is one of my favorite take-aways from the book. The (https://www.youtube.com/watch?v=6sNmJtoKDCo) Clarity talk mentioned at the beginning does a great job of showing how to use it when testing a feature. 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Though, I continue to maintain that the most important insight about testing is that there are two independent axes here:\n\nhow much IO is done by test (none > some FS access > some IPC > some HTTP to a different machine)\nwhich fraction of your codebase is exercised by the test (single function without dependencies > the entire thing)\n\nhttps://testing.googleblog.com/2010/12/test-sizes.html?m=1\nThere\u2019s also third axes, whether we are testing a single unit of behavior, or a more complicated composite flow, but it is of the least consequences for writing tests.\nEDIT: worth pointing out how the article (and I presume the book) avoids the usual confusion: it re-defines the meaning of unit! It uses neither the original meaning (unit is the test itself, unit of testing, as a encoding of a defined part of a manual testing process in a repl), nor the acquired meaning (unit as a component or module), and instead conveniently defines it as \u201cunit of behavior\u201d. 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