Log in as a configured account, with another password: the handle gives the username, so the feature file names no account either. The login screen must be open already. Use it for a wrong password.
Examples
When I log in as the "admin" user with password "not-the-password"
When we sign in as the "editor" user with password "wrong"
And log in as the "subscriber" user with password "wrong-password"
When I log in as the "author" user with password ""
And we sign in as the "contributor" user with password "nope"
Pattern
When(/^(I |we )*(?:log in|sign in) as the "([^"]*)" user with password "([^"]*)?"$/, …)
Part of @webship-js/wordpress-steps (github.com/webship/wordpress-steps), a step pack for Webship-js 2.0.x.