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Can anyone explain me the below scenario Code to be tested UserTransaction.java @Override public ServiceResponse<User> get(String name) { ServiceResponse<User> response = new ServiceResponse<User>(); List<Map<String, Object>> exp = new ArrayList<Map<String, Object>>(); Map<String, Object> map = new HashMap<String, Object>(); map.put("expression", "eq"); map.put("property", "name"); map.put("value", name); exp.add(map); List<User> users = userDao.getByCriteria(exp); if (!users.isEmpty()) { response.setResponse(users.get(0)); } else { response.setResponse(null); } return response; } UserDao.java public List<User> getByCriteria(List<Map<String, Object>> exp) { DetachedCriteria criteria = DetachedCriteria.forClass(User.class); for (Integer i=0;i<exp.size();i++){ String expression = (String) exp.get(i).get("expression"); String property = (String) exp.get(i).get("property"); if(expression.equals("eq"){ criteria.add(Restrictions.eq(property,exp.get(i).get("value"))); } } return hibernateTemplate.findByCriteria(criteria); } UserTransactionTest.java private UserTransaction userTransactions = new UserTransaction(); private UserDao userDao = mock(UserDao.class); @Test public void testGet() { User user = new User(); user.setName("Raman"); try { when(userDao.getByCriteria(anyList())).thenReturn(user); } catch (Exception e) { e.printStackTrace(); } ServiceResponse<User> response = userTransactions.get("raman"); User result = response.getResponse(); assertEquals("Raman", result.getName()); assertEquals(0, response.getErrors().size()); } works fine. But instead of "anyList()" I passed a user-defined list "myList" <p

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