Compatibility issue: Jest mock works in React / fails in Preact when using ForwardRef in a component about preact

[DanielMaczak]

Further information on this bug:

It occurs even when the forwardRef is used in the tested module like this, e.g. not referencing the tested component and not even imported in the tests at all:

export const Test= forwardRef(() => {
  return <div></div>;
});

I also pinpointed where the tests diverge between the two scenarios when forwardRef is used and isn't in the tested module:

node_modules / jsdom / lib / jsdom / living / events / EventTarget-impl.js > innerInvokeEventListeners :

  if (!listeners || !listeners[type]) {
    return found; // the code exits here when using forwardRef()
  }

---

EDIT: I found the compat piece of code causing this. I will try to come up with a solution and submit a pull request.

[DanielMaczak]

This is an issue with preact-testing-library. It does not translate event names to React version when preact/compat is imported. I will submit a fix there.