// When message is null, the parent constructor behavior applies
        assertNull(exception.getMessage());
        assertEquals(cause, exception.getCause());
    }

    @Test
    public void test_nestedExceptionChain() {
        // Test nested exception chain
        Exception rootCause = new IllegalStateException("Root cause");
        Exception middleCause = new RuntimeException("Middle cause", rootCause);

Shinsuke Sugaya <******@****.***> 1773442886 +0900