Schema mismatch, expected Pointer

Instead of:

return await user.signUp(null, { useMasterKey: true });

try:

await user.save(null, { useMasterKey: true });
return user;

Talking about jest, I’d need to better understand your setup. It might be related to the fact that you are probably running a Parse Server instance in the same process. Parse Server also instantiates the SDK. You can find some inspiration here: parse-blockchain/packages/integration at master · parse-community/parse-blockchain · GitHub