assertEquals("DOM", auth.getUserDomain());
        }
    }

    @Test
    @DisplayName("Protected setSubject: updates subject used by getters")
    void setSubject_updatesSubject() {
        Kerb5Authenticator auth = new Kerb5Authenticator((Subject) null);
        assertNull(auth.getSubject());
        Subject subject = new Subject();
        auth.setSubject(subject);