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vitest crib sheet

We just moved to a new testing framework, vitest. Here are some notes to help you get started.

Running tests

  • npm test will run the tests
  • npm run test:watch will run the watcher; which runs all the tests and then watches for changes and then runs on the changed tests. This is much quicker as a lot of the work is cached.
  • npm run test:watch <path> will do the same with just a path

Writing tests

In general use describe, it and expect as you would with jest. Import these all from vitest. If you need async things then use await expect(someAsyncThing()).resolves.toEqual(someValue).

The expect is pretty rich and supports a lot of matchers, like expect(x).toContain("moo") or expect(y).not.toHaveProperty("badger"). You can see the full list in the vitest documentation.