docs: document __tests__ directory test discovery convention#3385
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Since Deno 1.45 (denoland/deno#24443),
deno testtreats every script fileinside a
__tests__directory as a test file, in addition to files matchingthe
{*_,*.,}test.{ts, tsx, mts, js, mjs, jsx}glob. This convention wasnever mentioned on the testing page, which has caused confusion when
non-test files placed in such a directory get collected and type-checked
(denoland/deno#24594). This documents it next to the existing glob
description.