[HttpClient][MockHttpClient][DX] Throw when the response factory callable does not return a valid response #37966
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The current message is
TypeError: Argument 4 passed to Symfony\Component\HttpClient\Response\MockResponse::fromRequest() must implement interface Symfony\Contracts\HttpClient\ResponseInterface, instance of Generator given
.I lost some time with this because I was passing a callable that returns a \Generator instead of passing the resulting \Generator directly. We could support that case but I guess with the added exception message, it is clear we don't support it at all.