Terminal vercel env pull .env.local
Test Environment Variables
Apart from development and production environments, there is a 3rd option available: test. In the same way you can set defaults for development or production environments, you can do the same with a .env.test file for the testing environment (though this one is not as common as the previous two). Next.js will not load environment variables from .env.development or .env.production in the testing environment.
This one is useful when running tests with tools like jest or cypress where you need to set specific environment vars only for testing purposes. Test default values will be loaded if NODE_ENV is set to test, though you usually don't need to do this manually as testing tools will address it for you.