Jest Mocking

I'm getting `TypeError: (0 , _reactNavigationSharedElement.createSharedElementStackNavigator) is not a function`
when testing with jest `yarn test` or `npm jest`

I have added these mocks to jest Setup file
```javascript
jest.mock('react-native-shared-element', () => {
return () => ({});
});

jest.mock('react-navigation-shared-element', () => {
return () => ({
createSharedElementStackNavigator: jest.fn(),
});
});
```

But still failing to test with Jest

I'm using
"react-native": "0.64.0",
"jest": "^25.1.0",
"react-native-shared-element": "^0.7.0",
"react-navigation-shared-element": "3.0.0",

Start with the Jest setup file and the shown mocks, then run `yarn test` or `npm jest` to reproduce the reported TypeError. Compare the mocked `react-navigation-shared-element` export with the failing `createSharedElementStackNavigator` call; done means the Jest tests no longer fail with this error.

Written by the indexing model from the issue text.