### Question:
NumberOfTradesCriterion extends AbstractAnalysisCriterion { @Override public double calculate(TimeSeries series, TradingRecord tradingRecord) { return tradingRecord.getTradeCount(); }  @Override double calculate(TimeSeries series, TradingRecord tradingRecord); @Override double calculate(TimeSeries series, Trade trade); @Override boolean betterThan(double criterionValue1, double criterionValue2);  }### Answer:
@Test public void calculateWithNoTrades() { MockTimeSeries series = new MockTimeSeries(100, 105, 110, 100, 95, 105); AnalysisCriterion buyAndHold = new NumberOfTradesCriterion(); assertEquals(0d, buyAndHold.calculate(series, new BaseTradingRecord()), TATestsUtils.TA_OFFSET); }
@Test public void calculateWithTwoTrades() { MockTimeSeries series = new MockTimeSeries(100, 105, 110, 100, 95, 105); TradingRecord tradingRecord = new BaseTradingRecord( Order.buyAt(0), Order.sellAt(2), Order.buyAt(3), Order.sellAt(5)); AnalysisCriterion buyAndHold = new NumberOfTradesCriterion(); assertEquals(2d, buyAndHold.calculate(series, tradingRecord), TATestsUtils.TA_OFFSET); }
@Test public void calculateWithOneTrade() { Trade trade = new Trade(); NumberOfTradesCriterion tradesCriterion = new NumberOfTradesCriterion(); assertEquals(1d, tradesCriterion.calculate(null, trade), TATestsUtils.TA_OFFSET); }
@Test public void calculateWithNoTrades() { MockTimeSeries series = new MockTimeSeries(100, 105, 110, 100, 95, 105); AnalysisCriterion buyAndHold = new NumberOfTradesCriterion(); assertEquals(0d, buyAndHold.calculate(series, new TradingRecord()), TATestsUtils.TA_OFFSET); }
@Test public void calculateWithTwoTrades() { MockTimeSeries series = new MockTimeSeries(100, 105, 110, 100, 95, 105); TradingRecord tradingRecord = new TradingRecord( Order.buyAt(0), Order.sellAt(2), Order.buyAt(3), Order.sellAt(5)); AnalysisCriterion buyAndHold = new NumberOfTradesCriterion(); assertEquals(2d, buyAndHold.calculate(series, tradingRecord), TATestsUtils.TA_OFFSET); }