suspenseFallback option is not supported

[michael-vasyliv]

When writing a test to validate my component is rendered, I see the fallback value.
here is component

import { h } from 'preact';
import { memo, Suspense } from 'preact/compat';

const Container = memo(({ component }) => (
    <Suspense fallback='loading'>
        {h(component, {})}
    </Suspense>
))

export default Container;

here is test

import { shallow, mount } from 'enzyme';
import { h } from 'preact';
import Container from '../src/components/container';
import { lazy } from 'preact/compat';

const LazyComponent = lazy(() => import('../src/components/lazy-component'));

describe('Container', () => {

    it('renders the LazyComponent', () => {
        const wrapper = mount(<Container component={LazyComponent} />, { suspenseFallback: false });
        console.log(wrapper.debug());
        expect(wrapper.find(LazyComponent).length).toEqual(1);
    });
})

here is result of the console.log

    <Memo() component={[Function: u]}>
      <Component component={[Function: u]}>
        <d fallback="loading">
          <d />
          loading
        </d>
      </Component>
    </Memo()>

as you can see there is not any of LazyComponent only fallback
here is repo with code
https://github.com/michael-vasyliv/preact-project

similar issue in enzymejs/enzyme#2200

[robertknight]

Thank-you for the report! The suspenseFallback option was added in Enzyme v3.10.0 and is currently not handled at all by the Preact adapter.

The suspenseFallback option is also only available for shallow rendering, so your example project won't work with React either as far as I can see.

In the interim, I would look for examples of how to test suspense components and fallbacks that don't rely on Enzyme features but instead just use the regular React API.

[ashleyyang0610]

Hey any update to the issue? We encounter the same problem that willing to test suspense component in the Preact project.

[robertknight]

Hey any update to the issue?

No. Nothing has changed since my last comment.