At this point, the tests, support files and configuration files should be in their proper locations and you've changed the baseURL (Playwright)/baseUrl (Cypress) to point to the site you want to target.

Playwright

With Playwright, you can run the tests from within VS Code after you've installed the Playwright Test for VSCode plugin, which is an excellent way to write and debug Playwright tests. Here is a short tutorial on debugging within VS Code.

Or, from the command line, run tests with one of these:

npx playwright test # Runs all tests.
npx playwright test --grep "@ATK-PW-1160" # Run a single test.
npx playwright test --grep-invert "@alters-db". # Runs all tests except those that change the database.

Or, you can launch the Playwright GUI with:

npx playwright test --ui

Refer to the very good Playwright documentation or the many tutorials online to learn Playwright.

After this section are references to the tests and functions of the Automated Testing Kit. Study the existing tests to see examples of how the functions are used. If you have questions, ask them on the #automated_testing_kit channel of the Drupal Slack workspace.

Cypress

You can launch the Cypress GUI in End-to-End mode with Firefox with this command:

npx cypress open --e2e --browser=electron

Find the atk_register_login/atk_register_login.js file and click on it to run it.

Refer to the excellent Cypress documentation or watch many of the tutorials online to learn Cypress.