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