### Question:
Histogram implements Serializable { public Long getT() { return t; }  String getH(); void setH(String h); Long getT(); void setT(Long t);  }### Answer:
@Test public void getT() { Histogram hstm = new Histogram(); assertNull(hstm.getT()); hstm.setT((long) 123456); assertEquals(123456L, hstm.getT(), 0); }