I am trying to do a SnapShot verification using Jest for my React App for one of the functional ponent. Here is the ponent and test file using Jest

import React, { useState } from 'react';
import useForm from 'react-hook-form';
import { useAppState } from 'Shared/store';
...

const Form = () => {

const {customReducer, dispatch} = useAppState();
const { register, handleSubmit, errors, reset } = useForm({});

//custom form methods

return (
<>
   <Form ...>
     ...
   </Form>
   ....
</>
);
export default Form;

and my test using Jest

import React from 'react';
import TestRenderer from 'react-test-renderer';
import ShallowRenderer from 'react-test-renderer/shallow';
import Form from '../form';

describe('<Form />', () => {
    test('Snapshot', () => {
    const tree = TestRenderer.create(<Form />).toJSON();
    expect(tree).toMatchSnapshot();
  });
});

and i was getting below error TypeError: Invalid attempt to destructure non-iterable instance

Tried with Enzyme as well but getting the same error. Spend good time in referring other related questions but couldn't figure out. Thank you.

I am trying to do a SnapShot verification using Jest for my React App for one of the functional ponent. Here is the ponent and test file using Jest

import React, { useState } from 'react';
import useForm from 'react-hook-form';
import { useAppState } from 'Shared/store';
...

const Form = () => {

const {customReducer, dispatch} = useAppState();
const { register, handleSubmit, errors, reset } = useForm({});

//custom form methods

return (
<>
   <Form ...>
     ...
   </Form>
   ....
</>
);
export default Form;

and my test using Jest

import React from 'react';
import TestRenderer from 'react-test-renderer';
import ShallowRenderer from 'react-test-renderer/shallow';
import Form from '../form';

describe('<Form />', () => {
    test('Snapshot', () => {
    const tree = TestRenderer.create(<Form />).toJSON();
    expect(tree).toMatchSnapshot();
  });
});

and i was getting below error TypeError: Invalid attempt to destructure non-iterable instance

Tried with Enzyme as well but getting the same error. Spend good time in referring other related questions but couldn't figure out. Thank you.

• javascript
• reactjs
• jestjs
• enzyme
• destructuring

• do you mock any of hooks you are using in ponent? – skyboyer Commented Nov 14, 2019 at 16:55
• Hello, I have couple of hooks. useAppState(which uses internally useContext) and useState. I haven't mocked neither of them – siddhuKantipudi Commented Nov 14, 2019 at 18:41

1 Answer 1

Had a similar problem where Storybook threw Invalid attempt to destruct non-iterable instance on a ponent using hooks (useContext).

The solution was to initiate the context with a default value, createContext([{}, function() {}])

I found the solution here