Yup schema validation password and confirmPassword doesn't work

Question

import * as Yup from 'yup';
import User from '../models/User';

class UserController {
async store(req, res) {
const schema = Yup.object().shape({
  name: Yup.string().required(),
  email: Yup.string()
    .email()
    .required(),
  password: Yup.string()
    .required()
    .min(6),
});

if (!(await schema.isValid(req.body))) {
  return res.status(400).json({ error: 'Validation fails' });
}

const userExists = await User.findOne({ where: { email: req.body.email } });
if (userExists) {
  return res.status(400).json({ error: 'User already exists.' });
}
const { id, name, email, provider } = await User.create(req.body);
return res.json({ id, name, email, provider });
}

async update(req, res) {
const schema = Yup.object().shape({
  name: Yup.string(),
  email: Yup.string().email(),
  oldPassword: Yup.string().min(6),
  password: Yup.string()
    .min(6)
    .when('oldPassword', (oldPassword, field) =>
      oldPassword ? field.required() : field
    ),
  confirmPassword: Yup.string().when('password', (password, field) =>
    password ? field.required().oneOf([Yup.ref('password')]) : field
  ),
});

if (!(await schema.isValid(req.body))) {
  return res.status(400).json({ error: 'Validation fails' });
}

const { email, oldPassword } = req.body;
const user = await User.findByPk(req.userId);
if (user.email !== email) {
  const userExists = await User.findOne({
    where: { email },
  });
  if (userExists) {
    return res.status(400).json({ error: 'User already exists.' });
  }
}

if (oldPassword && !(await user.checkPassword(oldPassword))) {
  return res.status(401).json({ error: 'Password does not match.' });
}

const { id, name, provider } = await user.update(req.body);

return res.json({ id, name, email, provider });
  }  
}
export default new UserController();

here it creates a normal user with the password 123456

here it should work, since the old password is the same as the password of the created user, and it should update the new password

I want to try to understand how to make him understand the current password as oldpassword and update the password

Answer 1

Based on @anoNewb answer and the request made by @Renan,

Yup.object({
  password: Yup.string().required('Password is required'),
  passwordConfirmation: Yup.string()
    .test('passwords-match', 'Passwords must match', function(value){
      return this.parent.password === value
    })
})

Answer 2

This is how I did it.

yup.object({
  password: yup
    .string()
    .required('Please enter your password.')
    .min(8, 'Your password is too short.'),
  retypePassword: yup
    .string()
    .required('Please retype your password.')
    .oneOf([yup.ref('password')], 'Your passwords do not match.')
});