Code Review

This is a java code review exercise about an e-shop basket. Try to spot if there's something wrong about that code.

C# :

Basket code promo feature without tests

Java :

Basket code without tests

Basket code promo feature without tests

Javascript :

Basket code without enough tests

Basket code promo feature without tests

Python

Basket code promo feature without tests

Scala

Basket code promo feature without tests