### Question:
Impression implements Serializable { public void adjustPositive() { if (this.h0.getT() < 0) { this.h0 = new H0(0L); } if (this.h1.getT() < 0) { this.h1 = new H1(0L); } if (this.h2.getT() < 0) { this.h2 = new H2(0L); } if (this.h3.getT() < 0) { this.h3 = new H3(0L); } } Impression();  Impression(H0 h0, H1 h1, H2 h2, H3 h3);  Impression(Double[] dayCounts);  Impression(double[] dayCounts);  Impression(Map map); Long getTotal(); double getValueForHIndex(int h_index); long countImpressions(double price, TargetingChannel.PriceModel priceModel); H1 getH1(); void setH1(H1 h1); H0 getH0(); void setH0(H0 h0); H2 getH2(); void setH2(H2 h2); H3 getH3(); void setH3(H3 h3); Integer getH_index(); void setH_index(Integer h_index); void adjustPositive(); List<Double> getHs(); static Impression add(Impression i1, Impression i2); static Impression subtract(Impression i1, Impression i2); static Impression multiply(Impression i1, double r); long getCountByPriceCategory(int priceCategory); long getIndividualHistogramCountByPriceCategory(int priceCategory); void adjustValue(int priceCategory, long t); @Override String toString(); static final int TOTAL_NUM_OF_PRICE_CATEGORIES; }### Answer:
@Test public void adjustPositive() { H0 h0 = new H0(); h0.setH("-00"); h0.setT((long) -0); H1 h1 = new H1(); h1.setH("-11"); h1.setT((long) -1); H2 h2 = new H2(); h2.setH("-22"); h2.setT((long) -2); H3 h3 = new H3(); h3.setH("-33"); h3.setT((long) -3); Impression imp = new Impression(h0, h1, h2, h3); List<Double> exp = new ArrayList(); exp.add(0D); exp.add(-1D); exp.add(-2D); exp.add(-3D); assertEquals(exp.toString(), imp.getHs().toString()); imp.adjustPositive(); exp = new ArrayList(); for (int i = 0; i < 4; i++) exp.add(0D); assertEquals(exp.toString(), imp.getHs().toString()); }