@Override
    public String toString() {
        return getClass().getSimpleName() + " barCount: " + barCount;
    }
@Test
    public void naNValuesInInterval() {
        BaseBarSeries series = new BaseBarSeries("NaN test");
        for (long i = 0; i <= 10; i++) { // (0, NaN, 2, NaN, 4, NaN, 6, NaN, 8, ...)
            Num highPrice = i % 2 == 0 ? series.numOf(i) : NaN;
            series.addBar(ZonedDateTime.now().plusDays(i), NaN, highPrice, NaN, NaN, NaN);
        }

        AroonUpIndicator aroonUpIndicator = new AroonUpIndicator(series, 5);
        for (int i = series.getBeginIndex(); i <= series.getEndIndex(); i++) {
            if (i % 2 != 0) {
                assertEquals(NaN.toString(), aroonUpIndicator.getValue(i).toString());
            } else {
                assertNumEquals(aroonUpIndicator.getValue(i).toString(), series.numOf(100));
            }
        }
    }