@ParameterizedTest
    @NullAndEmptySource
    @ValueSource(strings = { "oops", "multi word", "中文" })
    @DisplayName("Message+Cause constructor: preserves both values; no interactions with cause")
    void messageAndCauseConstructor_preservesBoth(String message) {
        // Arrange & Act
        SMBProtocolDecodingException ex = new SMBProtocolDecodingException(message, mockCause);

        // Assert message and cause