A couple of uitility methods to create objects in tests

Factories.java

public class Factories {

    private Factories() { /* Prevent instantiation */ }

    public static <T> List<T> listOf(T... elements) {
        return Arrays.asList(elements);
    }

    public static <T> List<T> listOf(int howMuch, Supplier<T> supplier) {
        return listOf(howMuch, (Integer) -> supplier.get());
    }

    public static <T> List<T> listOf(int howMuch, Function<Integer, T> producer) {
        List<T> list = new ArrayList<>(howMuch);
        for (int i = 0; i < howMuch; i++) {
            list.add(producer.apply(i + 1));
        }
        return list;
    }
}