use (someone) as a guinea pig

Translations
использовать (кого-то) в качестве подопытного кролика
They used him as a guinea pig for their new product.
Они использовали его в качестве подопытного кролика для своего нового продукта.
Definitions
To use someone as a guinea pig means to experiment on them or to test something on them, often without their full consent or knowledge, similar to how guinea pigs are used in scientific research.