### Question:
DayImpression implements Serializable { public void initAggregate(double[] aggregatedHCounts) { this.hours = new ArrayList<>(); H0 h0t = new H0(aggregatedHCounts[0]); H1 h1t = new H1(aggregatedHCounts[1]); H2 h2t = new H2(aggregatedHCounts[2]); H3 h3t = new H3(aggregatedHCounts[3]); Impression impression = new Impression(h0t, h1t, h2t, h3t); hours.add(impression); for (int i = 0; i < 23; i++) { H0 h0tmp = new H0(0); H1 h1tmp = new H1(0); H2 h2tmp = new H2(0); H3 h3tmp = new H3(0); Impression impressionTmp = new Impression(h0tmp, h1tmp, h2tmp, h3tmp); hours.add(impressionTmp); } } DayImpression(String date, List<Impression> hours);  DayImpression();  DayImpression(Double[] dayCounts);  DayImpression(Object hoursMap); String getDate(); void setDate(String date); List<Impression> getHours(); void setHours(List<Impression> hours); void initAggregate(double[] aggregatedHCounts); long countImpressions(double price, TargetingChannel.PriceModel priceModel); static DayImpression add(DayImpression d1, DayImpression d2); static DayImpression buildEmptyDayImpression(String date); static DayImpression subtract(DayImpression d1, DayImpression d2); static DayImpression multiply(DayImpression d1, double r); @Override String toString();  }### Answer:
@Test public void initAggregate() { Double[] dayCnt = new Double[]{24.1, 25.2, 26.3, 27.4}; DayImpression di = new DayImpression(dayCnt); double[] agrCnt = new double[]{19.0, 20.0, 30.0, 40.0}; di.initAggregate(agrCnt); List<Impression> exp = new ArrayList(); exp.add(new Impression(new H0(19D), new H1(20D), new H2(30D), new H3(40D))); H0 h0t = new H0(0); H1 h1t = new H1(0); H2 h2t = new H2(0); H3 h3t = new H3(0); Impression imp = new Impression(h0t, h1t, h2t, h3t); for (int i = 0; i < 23; i++) { exp.add(imp); } assertEquals(exp.toString(), di.getHours().toString()); }