assertThrows(NullPointerException.class, () -> {
            encodable.encode(dest, 0);
        }, "Should throw NullPointerException if source array is null");
    }

    @Test
    void testEncodeNullDestinationArray() {
        // Test with a null destination array
        byte[] data = { 0x01 };
        ByteEncodable encodable = new ByteEncodable(data, 0, 1);

        // Expect NullPointerException from System.arraycopy