我正在尝试实现Mockito来测试特定方法，但. thenBack（…）似乎总是返回一个null对象，而不是我想要的：
我正在使用mockito 2.22.0和Junit-5和spring-boot 2.0.4。释放
用户结果用户=userService.save（userDto）；上面一行返回总是空指针例外。不知道为什么结果用户总是重新调整空，
@SpringBootTest
public class UserServiceTests {
@InjectMocks
private UserService userService =new UserServiceImpl();
@Mock
private UserRepository userRepository;
@Mock
BCryptPasswordEncoder passwordEncoder;
@BeforeEach
void setUp() throws Exception{
MockitoAnnotations.initMocks(this);
}
@DisplayName("Test saveRegistrationTest method making call to Repository")
@Test
public void saveRegistrationTest() {
User user =new User();
user.setFirstName("TestFN");
user.setLastName("TestLN");
user.setEmail("test@test.com");
user.setPassword("7asdf7asdfi");
User testUser =new User();
testUser.setFirstName("TestFN");
UserRegistrationDto userDto = new UserRegistrationDto();
userDto.setFirstName("TestFN");
when(userRepository.save(testUser )).thenReturn(user);
**User resultUser=userService.save(userDto);**
String firstName=(userService.save(userDto)).getFirstName();
String lastName=(userService.save(userDto)).getLastName();
String resultEmailFromRepo=(userService.save(userDto)).getEmail();
String password=(userService.save(userDto)).getPassword();
assertNotNull(user);
assertEquals("TestLN", firstName);
assertEquals("TestLN", lastName);
assertEquals("test@test.com", resultEmailFromRepo);
assertNotNull(password);
assertEquals("7asdf7asdfi", password);
}
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String firstName;
private String lastName;
private String email;
private String password;
@OneToMany(cascade = CascadeType.ALL)
private List<Todo> todoList = new ArrayList<>();
@ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
@JoinTable(
name = "users_roles",
joinColumns = @JoinColumn(
name = "user_id", referencedColumnName = "id"),
inverseJoinColumns = @JoinColumn(
name = "role_id", referencedColumnName = "id"))
private Collection<Role> roles;
public class UserRegistrationDto {
@NotEmpty
private String firstName;
@NotEmpty
private String lastName;
@NotEmpty
private String password;
@NotEmpty
private String confirmPassword;
@Email
@NotEmpty
private String email;
@Email
@NotEmpty
private String confirmEmail;
@AssertTrue
private Boolean terms;
public User save(UserRegistrationDto registration){
User user = new User();
user.setFirstName(registration.getFirstName());
user.setLastName(registration.getLastName());
user.setEmail(registration.getEmail());
user.setPassword(passwordEncoder.encode(registration.getPassword()));
user.setRoles(Arrays.asList(new Role("TEST_USER")));
user.setTodoList(null);
return userRepository.save(user);
}
@InjectMocks
private UserService userService = new UserServiceImpl();
这个“对象”从来不是Spring管理的！
@SpringBootTest
class UserServiceTest {
@Autowired
private UserService testee;
@MockBean
private UserRepository userRepoMock; // done!
// ... many test methods, like: when(userRepoMock.xxx).thenYYY
// testee.someMethod()
// verify(userRepoMock...)
// ...
}
服务看起来像：
@Service // or some other "spring managed bean"
public class UserService {
@Autowired
private UserRepository userRepository;
...
}
正如约翰内斯评论的那样：
@BeforeEach
在此设置中不需要（但不有害？？！）。
当我们使用具体对象实例作为mockito的“参数匹配器”时：
when(userRepository.save(someObject)).thenReturn(someMock);
，我们应该确保，当（在测试期间）：
userRepository(someOtherObject)
…被称为，
someObject.equals(someOtherObject)
…是true！（“平等匹配器”）
否则mockito不能'/不会匹配该调用。
我们可以通过实现（自定义）equals（和hashCode）方法来解决：
// e.g. with lombok:
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
// ...
class UserRegistrationDto {
@EqualsAndHashCode.Include
String name;
}
EqualsAndHashCode（推荐，但要做好！（龙目岛小字，或手册！））
或者通过使用“更广泛的参数匹配器”，例如：
when(userRepository.save(any(UserRegistrationDto.class)).thenReturn(myMockResponse);
…甚至：
when(userRepository.save(any(/*java.lang.Object*/))...
参数匹配器javadoc
