public Num getK() {
        return k;
    }
@Test
    public void bollingerBandsUpperUsingSMAAndStandardDeviation() {

        BollingerBandsMiddleIndicator bbmSMA = new BollingerBandsMiddleIndicator(sma);
        StandardDeviationIndicator standardDeviation = new StandardDeviationIndicator(closePrice, barCount);
        BollingerBandsUpperIndicator bbuSMA = new BollingerBandsUpperIndicator(bbmSMA, standardDeviation);

        assertNumEquals(2, bbuSMA.getK());

        assertNumEquals(1, bbuSMA.getValue(0));
        assertNumEquals(2.5, bbuSMA.getValue(1));
        assertNumEquals(3.633, bbuSMA.getValue(2));
        assertNumEquals(4.633, bbuSMA.getValue(3));
        assertNumEquals(4.2761, bbuSMA.getValue(4));
        assertNumEquals(4.6094, bbuSMA.getValue(5));
        assertNumEquals(5.633, bbuSMA.getValue(6));
        assertNumEquals(5.2761, bbuSMA.getValue(7));
        assertNumEquals(5.633, bbuSMA.getValue(8));
        assertNumEquals(4.2761, bbuSMA.getValue(9));

        BollingerBandsUpperIndicator bbuSMAwithK = new BollingerBandsUpperIndicator(bbmSMA, standardDeviation,
                numFunction.apply(1.5));

        assertNumEquals(1.5, bbuSMAwithK.getK());

        assertNumEquals(1, bbuSMAwithK.getValue(0));
        assertNumEquals(2.25, bbuSMAwithK.getValue(1));
        assertNumEquals(3.2247, bbuSMAwithK.getValue(2));
        assertNumEquals(4.2247, bbuSMAwithK.getValue(3));
        assertNumEquals(4.0404, bbuSMAwithK.getValue(4));
        assertNumEquals(4.3737, bbuSMAwithK.getValue(5));
        assertNumEquals(5.2247, bbuSMAwithK.getValue(6));
        assertNumEquals(5.0404, bbuSMAwithK.getValue(7));
        assertNumEquals(5.2247, bbuSMAwithK.getValue(8));
        assertNumEquals(4.0404, bbuSMAwithK.getValue(9));
    }