Vitest / React act

This reproduces an issue where act react-testing-library doesn't suppress act warnings when using vitest.

Get started

• Clone the repo
• Run npm install
• Run npm run vitest

This will run the tests with vitest and you will see an act warning. The test being run is in src/reproduction.test.jsx.

You can also run npm run jest to see what the output looks like using jest. There are no act warnings when running with jest. (You may need to press a to have jest run all the tests)

Works with React 17

If you run the following, the tests will run in vitest with no act warning.

npm install react@17 react-dom@17 @testing-library/react@12
npm run vitest