assertEquals(0, next.writeDataWireFormat(buf, 0));
    }

    /**
     * Ensures toString contains key fields with expected formatting.
     */
    @Test
    void testToStringContainsExpectedFields() {
        // Given
        int sid = 4660; // 0x1234, printed as decimal
        int resumeKey = 0x01020304; // shows only low 4 hex digits per implementation
        String name = "name";