test(gatsby): Migrate to vitest #15494
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Ref #11084
Before:
6.437 sAfter:
1.23sThe first thing we did was migrate the
pretest.tsscript to use a vitest global setup instead. This is cleaner, and should ensure it never gets lost in refactors either.After that we did the conversion. The trickiest thing to change was
packages/gatsby/test/gatsby-node.test.ts, asgatsby-node.jsis a CJS file. This is tricky to patch properly with vitest for the spy. To get around this, we monkeypatchModule._loadtemporarily to load a stub which we defined invi.hoisted(which hoists it to the top so it's always available).