I believe this is more about bypass for test automation using the test feature of the CAPTCHA framework, and not about hacking around the system to do stuff.
With Google's implementation, it's not clear with details on how to invoke test mode with one's account for v3, but v2's documentation appears more explicit of how to enable test mode:
It might be good if someone here could elaborate on exactly how you do test mode in v3, it mentions creating separate keys say for staging & test environments, but keys probably just mean enable CAPTCHA for use in those environments, how to indicate that the key is test key and go into test mode? Maybe there is documentation not referenced. I haven't worked in this area nor used Google CAPTCHA system to know the details.