Runtime error with sign()

[hype08]

i'm trying to create a unit test of a function/service which basically just encapculates SignJWT.

// service for example purposes

export const generateJWT = async (
  payload: Record<string, unknown>,
  secret: string,
  {
    algorithm = DEFAULT_TOKEN_ALGORITHM,
    audience = DEFAULT_AUDIENCE,
    expiry = DEFAULT_TOKEN_EXPIRY,
    issuer = DEFAULT_TOKEN_ISSUER
  } = {}
): Promise<string> => {
  const token = await new SignJWT(payload)
    .setAudience(audience)
    .setExpirationTime(expiry)
    .setIssuedAt()
    .setIssuer(issuer)
    .setJti(randomUUID())
    .setProtectedHeader({ alg: algorithm })
    .sign(new TextEncoder().encode(secret));

  return (token as unknown) as string;
};

The code works perfectly and so easy to use. it creates a token as expected. but now I'd like to unit test that the token gets created properly much like this example you have:
https://github.com/panva/jose/blob/main/test/jwt/sign.test.mjs#L18-L26

Inside of a jest assertion, example purposes

describe (generateJWT)

it (should make a JWT token)
     await generateJWT(payload, secret)

if i test everything before that, setProtectedHeaders, i am able to expect toEqual the correct header and payload

but i can't test sign(), it fails with this error when it gets to .sign()

 hmac.update(data);
             ^
TypeError: Cannot read properties of undefined (reading 'update')
    at sign (...node_modules/jose/dist/node/cjs/runtime/sign.js:20:14)
    at FlattenedSign.sign (...node_modules/jose/dist/node/cjs/jws/flattened/sign.js:68:55)
    at CompactSign.sign (...node_modules/jose/dist/node/cjs/jws/compact/sign.js:14:43)
    at SignJWT.sign (...node_modules/jose/dist/node/cjs/jwt/sign.js:22:20)

i'm also able to set spyOn sign(), so that i can see that it gets called in the creation of the token.

but i'm stuck with this error - how can i test with jest to expect it to be equal to a specific token like in your example?

[hype08]

This is where I'm hitting the error
node_modules/jose/dist/node/cjs/runtime/sign.js

const sign = async (alg, key, data) => {
    const keyObject = (0, get_sign_verify_key_js_1.default)(alg, key, 'sign');
    if (alg.startsWith('HS')) {
        const hmac = crypto.createHmac((0, hmac_digest_js_1.default)(alg), keyObject);
        hmac.update(data);
        return hmac.digest();
    }
    return oneShotSign((0, dsa_digest_js_1.default)(alg), data, (0, node_key_js_1.default)(alg, keyObject));