Our end-to-end tests use Cypress to test our entire application stack.
To develop tests; from the root directory, run
yarn e2e open
This will open the cypress test runner, you can then debug and develop your tests.
To just run the tests without viewing the UI, use yarn e2e run.
During development, the end-to-end tests run against the development server so that you can benefit from all your usual development enhancements such as hot reloading, debugger integration, etc.