TreeSetTest

public class TreeSetTest{

    @Test
    public void someUnitTest() {
        OrderTransaction orderTransaction = new OrderTransaction();
        SortedSet<PriceTime> previousPrices = new TreeSet<>(Comparator.comparingLong(PriceTime::getTimestamp));
//        Set<PriceTime> previousPrices = new TreeSet<>();
        for (int i = 10000; i >= 0; i--) {
            previousPrices.add(new PriceTime(new Price(i), i));
        }
/*        for (int i = 0; i <= 10000; i++) {
            previousPrices.add(new PriceTime(new Price(i), i));
        }*/
        orderTransaction.setPreviousPrices(previousPrices);

        assertEquals(10000, orderTransaction.getPreviousPrices().last().getTimestamp());
        assertEquals(0, orderTransaction.getPreviousPrices().first().getTimestamp());
    }
}