@Override
public Store getStore() throws IllegalArgumentException {
//newStore is the distant store for demonstration purpose only ^^
Store newStore = new Store();
newStore.addArticle(new Article ("computer",10));
newStore.addArticle(new Article ("macbook",2));
newStore.addArticle(new Article ("pen",3));
newStore.addArticle(new Article ("car",5));
return newStore;
}