### Question:
NumberOfTradesCriterion extends AbstractAnalysisCriterion { @Override public Num calculate(BarSeries series, TradingRecord tradingRecord) { return series.numOf(tradingRecord.getTradeCount()); }  @Override Num calculate(BarSeries series, TradingRecord tradingRecord); @Override Num calculate(BarSeries series, Trade trade); @Override boolean betterThan(Num criterionValue1, Num criterionValue2);  }### Answer:
@Test public void calculateWithNoTrades() { MockBarSeries series = new MockBarSeries(numFunction, 100, 105, 110, 100, 95, 105); AnalysisCriterion buyAndHold = getCriterion(); assertNumEquals(0, buyAndHold.calculate(series, new BaseTradingRecord())); }
@Test public void calculateWithTwoTrades() { MockBarSeries series = new MockBarSeries(numFunction, 100, 105, 110, 100, 95, 105); TradingRecord tradingRecord = new BaseTradingRecord(Order.buyAt(0, series), Order.sellAt(2, series), Order.buyAt(3, series), Order.sellAt(5, series)); AnalysisCriterion buyAndHold = getCriterion(); assertNumEquals(2, buyAndHold.calculate(series, tradingRecord)); }
@Test public void calculateWithOneTrade() { MockBarSeries series = new MockBarSeries(numFunction, 100, 105, 110, 100, 95, 105); Trade trade = new Trade(); AnalysisCriterion tradesCriterion = getCriterion(); assertNumEquals(1, tradesCriterion.calculate(series, trade)); }