UserLoginTestCase::testGlobalLoginFloodControl in core/modules/user/tests/user.test
Test the global login flood control.
UserLoginTestCase::testLoginMethods in core/modules/user/tests/user.test
Test that login credentials work (or not) in different login modes.
UserLoginTestCase::testPerUserLoginFloodControl in core/modules/user/tests/user.test
Test the per-user login flood control.