我正在junit為我的方法編寫一個測試用例service，它有一個外部調用jpa repository，我想這樣做mock。此方法findall(Pageable pageable)返回page由映射器映射的實體Mapstruct's。但是，NPE當我assert返回時，我得到了一個。可能有一些我遺漏的東西，我不確定如何mock調用這個方法。我試過像這樣編寫測試用例測試用例：public class myTestclass {@Testpublic void testFindAllUser() {User user1 = new User();user1.setId(Long.valueOf(1));User user2 = new User();user2.setId(Long.valueOf(2));List<User> userList = new ArrayList<>();userList.add(user1);userList.add(asset2);Pageable pageable = PageRequest.of(0, 5);Page<User> userPage = new PageImpl<>(userList, pageable, userList.size());Page<UserDto> userDtoPage = null;Mockito.when(userRepositoryMock.findAll(pageable)).thenReturn(userPage);Mockito.when(userPage.map(userMapperMock::toDto)).thenReturn(userDtoPage);// expecting to mock this object in// some other way.assertThat(userService.findAll(pageable)).isEqualTo(userDtoPage); // throws NPE}}我正在為其編寫測試用例的方法：public Page<UserDto> findAll(Pageable pageable) {return userRepository.findAll(pageable).map(userMapper::toDto);}這是我的映射器類：@Mapper(componentModel = "spring", uses = { FarmerMapper.class })public interface UserMapper extends EntityMapper<UserDto, User> {UserDto toDto(User user);User toEntity(UserDto userDto);}mapper模擬該方法toDto以使其返回頁面的正確方法是什么userDto？
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TA貢獻1735條經驗 獲得超5個贊
由于.map使用UserMapper's toDto方法來轉換頁面的每個元素，我模擬了多個元素userMapper來解決這個問題。
因此，我創(chuàng)建了 2 個頁面，一個User用于UserDto. 所以我的測試用例被修改為
@Test
public void testFindAllUser() {
User user1 = new User();
user1.setId(DEFAULT_ID);
User user2 = new User();
user2.setId(2L);
List<User> userList = new ArrayList<>();
userList.add(user1);
userList.add(user2);
Pageable pageable = PageRequest.of(0, 5);
Page<User> userPage = new PageImpl<>(userList, pageable, userList.size());
UserDto userDto1 = new UserDto();
userDto1.setId(Long.valueOf(1));
UserDto userDto2 = new UserDto();
userDto2.setId(Long.valueOf(2));
List<UserDto> userDtoList = new ArrayList<>();
userDtoList.add(userDto1);
userDtoList.add(userDto2);
Page<UserDto> userDtoPage = new PageImpl<>(userDtoList, pageable, userDtoList.size());
Mockito.when(userMapperMock.toDto(user1)).thenReturn(userDto1);
Mockito.when(userMapperMock.toDto(user2)).thenReturn(userDto2); //Mocking the toDto method.
Mockito.when(userRepositoryMock.findAll(pageable)).thenReturn(userPage);
assertThat(userService.findAll(pageable)).isEqualTo(userDtoPage);
}
現(xiàn)在，如果有更多的元素要添加到頁面，我會對toDto所有元素進行相同的模擬。
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