[InteractsWithLiveComponent] Validate the response of a failed LiveAction

[Mauriceu]

Consider the following: A client invokes a LiveComponents LiveAction that does some work. However, that LiveAction fails somehow and raises an UnprocessableEntityHttpException to re-render the Component, e.g. to render an error message.

As an example consider this LiveAction:

#[AsLiveComponent(template: 'component.html.twig')]
class Component {
    #[LiveAction]
    public function doSomething(): void
    {
         // do some work...
         if ($success === false) {
                  // this property is rendered in the template
                  $this->rendered_errors[] = "Oh no, something went wrong ...";
                  throw new UnprocessableEntityHttpException();
         }
    }
}

A test for this LiveAction would look something like this:

class ComponentTest extends KernelTestCase {
    use InteractsWithLiveComponents;

    public function testLiveActionError(): void
    {
        $component = $this->createLiveComponent(Component::class);
        try {
            $component = $testComponent->call('doSomething');
        } catch (\Throwable $e) {
            self::assertInstanceOf(UnprocessableEntityHttpException::class, $e);

            // I would expect the response to contain html populated with the values in the "rendered_errors" property
            // however, this is not the case. It seems the previous content is being retrieved.
            // $html = $testComponent->response()->getContent();
            // self::assertStringContainsString('Oh no, something went wrong ...', $html);
        }
    }
}

As it stands it is impossible to assert the rendered content upon failure of a LiveAction, though I'd love to be proven wrong.
I built some workarounds for this issue, but its kind of a messy hassle honestly. Any ideas?