- Référence externe : https://doc.rust-lang.org/stable/book/ch15-05-interior-mutability.html
RefCell<T> and the Interior Mutability Pattern - The Rust Programming Language
Mutating the value inside an immutable value is the interior mutability pattern
A test double is the general programming concept for a type used in place of another type during testing. Mock objects are specific types of test doubles that record what happens during a test so you can assert that the correct actions took place.