// toString should include the derived message
        assertEquals(SMBProtocolDowngradeException.class.getName() + ": " + expectedMessage, ex.toString());
    }

    @Test
    void messageAndCauseConstructor_setsMessageAndCause_withoutInteractingWithCause() {
        // Arrange - mock cause to verify no interactions are needed to construct
        Throwable cause = Mockito.mock(Throwable.class);
        String message = "forced downgrade detected";