Multiple tests are failing with two distinct errors.

Error 1: Error: Call to undefined method GuzzleHttp\Utils::chooseHandler()

The cause for this error is unknown. I cannot duplicate this error locally, so more investigation is required

Error 2: LogicException: Component "symfony/browser-kit" is required by WebTestCase. Run composer require symfony/browser-kit

This is most likely because Silex has been abandoned for some time. We should remove or refactor silex entirely out of our samples.