USING: io.pathnames tools.test urls ; IN: webbrowser { t } [ "http://reddit.com" url-string? ] unit-test { t } [ "https://reddit.com" url-string? ] unit-test { t } [ "ftp://reddit.com" url-string? ] unit-test { f } [ "moo" url-string? ] unit-test { f } [ 123 url-string? ] unit-test { } [ "" absolute-path open-item ] unit-test { } [ URL" http://www.google.com" open-item ] unit-test