Rapid succession button clicking usually combines many different tests:

- Performance

- Usability

- Brute-force capabilities

- Error handling

- And in this case, Security, a bug where trying to log in a couple of times on the Login screen with an empty, or set, password.

A test scenario closer to this would be:

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When I am on the login screen

And I enter 'root' in the 'Username' field

And I enter 'thispasswordisfalse' in the 'Password' field

And I press the 'Login' button '10' times

Then I should see the text 'Your password is invalid'

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Please note that this issue is not just in the Settings page, it takes place on the login screen as well, that's why I'm shocked, it's such a core functionality, touching so many system components.