assertNull(nullException.getMessage());
    }

    @Test
    @DisplayName("Test constructor with cause creates exception with specified cause")
    public void testConstructorWithCause() {
        // Create a root cause exception
        RuntimeException rootCause = new RuntimeException("Root cause error");
        TransportException exception = new TransportException(rootCause);

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