### Question:
Histogram implements Serializable { public void setH(String h) { this.h = h; }  String getH(); void setH(String h); Long getT(); void setT(Long t);  }### Answer:
@Test public void setH() { Histogram hstm = new Histogram(); hstm.setH("2018-01-05"); assertEquals("2018-01-05", hstm.getH()); }