@ValueSource(strings = { "", " ", "simple", "with unicode Ω≈ç√", "long-0123456789-abcdefghijklmnopqrstuvwxyz" })
    @DisplayName("Message-only ctor: propagates message and unsuccessful status")
    void messageOnlyConstructor_setsMessage_andUnsuccessfulStatus(String msg) {
        // Arrange & Act
        SMBSignatureValidationException ex = new SMBSignatureValidationException(msg);

        // Assert
        if (msg == null) {