Unexpected return value

[Loopite]

I recently installed libsodium through VCPKG using vcpkg install libsodium:x64-windows-static. Here the output of the download. You can see the version bellow I'm currently using.

libsodium:x64-windows-static                      1.0.18#8            A modern and easy-to-use crypto library

I implemented a function in gtest:

#include <gtest/gtest.h>

#include "sodium/crypto_aead_chacha20poly1305.h"
#include "sodium/randombytes.h"

#include <QDebug>

TEST(App, chacha20_Encrypt_Basics)
{
#define MESSAGE (const unsigned char *) "test"
#define MESSAGE_LEN 4
#define ADDITIONAL_DATA (const unsigned char *) "123456"
#define ADDITIONAL_DATA_LEN 6

    unsigned char nonce[crypto_aead_chacha20poly1305_IETF_NPUBBYTES];
    unsigned char key[crypto_aead_chacha20poly1305_IETF_KEYBYTES];
    unsigned char ciphertext[MESSAGE_LEN + crypto_aead_chacha20poly1305_IETF_ABYTES];
    unsigned long long ciphertext_len;

    crypto_aead_chacha20poly1305_ietf_keygen(key);
    randombytes_buf(nonce, sizeof nonce);

    if (crypto_aead_chacha20poly1305_ietf_encrypt(ciphertext, &ciphertext_len,
        MESSAGE, MESSAGE_LEN,
        ADDITIONAL_DATA, ADDITIONAL_DATA_LEN,
        NULL, nonce, key) != 0)
    {
        qDebug() << "GOOD #1";
    }

    qDebug() << "ENCRYPTED DATA = " << QByteArray((char*)ciphertext, ciphertext_len).toHex();

    unsigned char decrypted[MESSAGE_LEN];
    unsigned long long decrypted_len;
    if (crypto_aead_chacha20poly1305_ietf_decrypt(decrypted, &decrypted_len,
        NULL,
        ciphertext, ciphertext_len,
        ADDITIONAL_DATA,
        ADDITIONAL_DATA_LEN,
        nonce, key) != 0) {

        qDebug() << "GOOD #2";
    }

    qDebug() << "DECRYPTED DATA = " << QByteArray((char*)decrypted, decrypted_len).toHex();
}

The thing is "GOOD #N" messages DO NOT appear. However, the output of encryption works and decryption output works too. Why do crypto_aead_chacha20poly1305_ietf_encrypt and crypto_aead_chacha20poly1305_ietf_decrypt return 0 ? What should I do ?