### Question:
GetEntityByID implements Operation { public GetEntityByID(ID id) { super(); this.id = id; } GetEntityByID(ID id); ID getId(); @Override String toString();  }### Answer:
@Test public void testGetEntityById(){ ID id = Entity.ID.valueOf("test-id"); GetEntityByID getEntityById = new GetEntityByID(id); assertEquals(getEntityById.getId(), id); assertEquals(getEntityById.toString(), "Operation [Get Entity] Entity ID [test-id]"); }