assertTrue(cloned.toString().startsWith("Kerb5Authenticator["));
    }

    @Test
    @DisplayName("equals/hashCode: subject semantics")
    void equalsAndHashCode_subjectSemantics() {
        Kerb5Authenticator a = new Kerb5Authenticator((Subject) null);
        Kerb5Authenticator b = new Kerb5Authenticator((Subject) null);

        // Both null subjects -> equal