}

    // Behavior check: toString contains class name and message when present
    @Test
    @DisplayName("toString contains class name and message when provided")
    void toString_containsClassName_and_Message() {
        // Arrange
        String msg = "signature invalid";
        SMBSignatureValidationException ex = new SMBSignatureValidationException(msg);

        // Act

Shinsuke Sugaya <******@****.***> 1755149504 +0900