### Question:
BaseService implements IBaseService { @Override public Object get(Class<?> clazz, Serializable id) { return getBaseDao().get(clazz, id); }  @Override void save(BaseEntity obj); @Override void delete(BaseEntity obj); @Override void delete(Class<?> clazz, Serializable id); @Override void saveOrUpdate(BaseEntity obj); @Override void update(BaseEntity obj); @Override Object get(Class<?> clazz, Serializable id); @Override Object load(Class<?> clazz, Serializable id);  }### Answer:
@Test public void testGet() { for (String userId : userMap.keySet()) { TTestUser testUser = (TTestUser) baseService.get(TTestUser.class, userId); assertNotNull("get方法加载对象，如果指定主键的id不存在，返回null！", testUser); } TTestUser testUser = (TTestUser) baseService.get(TTestUser.class, "1"); assertNull("get方法加载对象，如果指定主键的id不存在，返回null！", testUser); }