I'm experiencing similar issues.

I think it arises from https://github.com/WordPress/gutenberg/blob/trunk/packages/e2e-test-utils-playwright/src/config.ts where WP_ADMIN_USER is set hard-coded and not configurable by process.env.

Further in the code WP_ADMIN_USER is used and not WP_USERNAME or WP_PASSWORD.

I'm not very fluent in TypeScript but changing the javascript to my example below fixes the issue for me.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.WP_BASE_URL = exports.WP_PASSWORD = exports.WP_USERNAME = exports.WP_ADMIN_USER = void 0;

const { WP_USERNAME = 'admin', WP_PASSWORD = 'password', WP_BASE_URL = 'http://localhost:8889', } = process.env;
const WP_ADMIN_USER = {
    username: WP_USERNAME,
    password: WP_PASSWORD,
};
exports.WP_ADMIN_USER = WP_ADMIN_USER;
exports.WP_USERNAME = WP_USERNAME;
exports.WP_PASSWORD = WP_PASSWORD;
exports.WP_BASE_URL = WP_BASE_URL;
//# sourceMappingURL=config.js.map

Hi @joostdekeijzer

Thanks for sharing it. Yeah, it seems WP_ADMIN_USER was hardcoded and hence it wasn't working. However, I have tried testing your PR and it didn't seem to be working and was throwing errors.
Block-scoped variable 'WP_ADMIN_USER' used before its declaration,
It indicates that you are trying to access the WP_ADMIN_USER variable before it has been defined. This error occurs when the variable is declared using const and you are trying to use it in the same block or scope before its assignment.

With little modification, I was able to solve this issue. Now with the new PR, it seems to be working perfectly fine.

Hi @juhi123,

Yes, sort of typo 🙄 That's what happens when you try a quick edit online without testing environment...

Yeah, I can relate 😄 @joostdekeijzer