Chrome told me as follows:
Your connection is not private
Attackers might be trying to steal your information from test.wikipedia.beta.wmflabs.org (for example, passwords, messages, or credit cards). Learn more
NET::ERR_CERT_DATE_INVALID
To get Chrome’s highest level of security, turn on enhanced protection
This server could not prove that it is test.wikipedia.beta.wmflabs.org; its security certificate expired in the last day. This may be caused by a misconfiguration or an attacker intercepting your connection. Your computer's clock is currently set to Monday, October 17, 2022. Does that look right? If not, you should correct your system's clock and then refresh this page.

Proceed to test.wikipedia.beta.wmflabs.org (unsafe)