new KerberosPacAuthData(invalidVersionPac, keys);
        });
        assertTrue(e.getMessage().contains("PAC"));
    }

    // Test exception for missing buffers
    @Test
    void testConstructorMissingBuffers() throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);

        // Write header with no buffers