Junit and mockito with spring boot list is not available - spring-boot

Question

hi every one i have some problem
i have a test class called TestUserService
#RunWith(MockitoJUnitRunner.class)
public class TestUserService {
#InjectMocks
UserService userService;
#Mock
InMemory inMemory;
#Before
public void init(){
MockitoAnnotations.initMocks(this);
}
#Test
public void registry(){
System.out.println("hi");
UserDto userDto=new UserDto(1L,"abed","alrhman",26);
UserDto userDto1=new UserDto(1L,"abdallah","almasre",27);
UserDto userDto2=new UserDto(1L,"bisher","alahmad",35);
UserDto userDto3=new UserDto(1L,"ibrahem","alrabe",32);
userService.registry(userDto);
userService.registry(userDto1);
userService.registry(userDto2);
userService.registry(userDto3);
System.out.println("\"registry\" = " + "registry");
verify(inMemory,times(0)).save(userDto.ToDTO(userDto));
verify(inMemory,times(1)).save(userDto1.ToDTO(userDto1));
verify(inMemory,times(0)).save(userDto2.ToDTO(userDto2));
verify(inMemory,times(0)).save(userDto3.ToDTO(userDto3));
}
}
when run the test i want save new user by UserService class and UserService will go to InMemory class
#Service
public class UserService implements IUserService {
private final InMemory inMemory;
public UserService(InMemory inMemory){
this.inMemory=inMemory;
}
#Override
public UserDto registry(UserDto userDto) {
User user=userDto.ToDTO(userDto);
User user1=inMemory.save(user);
return user.toEntity(user1);
}
}
the problem in InMemory Class it is a local repository has Map Called users and some other methods
after called registry(User user) method
the Map has it when debugger 'this' is not available
and the user param not receive into the save(User user) method and the debugger dont walk of any point check
private Map<Long,User> users=new HashMap<>();
#Override
public User save(User user) {
user.setId(1L);
users.put(1L,user);
return user;
}
and this is Image when debugger code
if you attention save(User user) dont has object or any value and users map not avalible

Answer 1

In your test, you are defining InMemory as a mock. A mock is an object that emulates the behavior of a real object according to how you configure such mock to behave. Having said that, your InMemory object in your test is not a real InMemory object, but a simple mock which means that its real code will not be called. Take a look at #Spy and consider replacing #Mock with it. Find more information in the following articles:
https://medium.com/swlh/what-is-the-difference-between-a-mock-and-a-stub-bd6b639e9fa5
https://www.baeldung.com/mockito-annotations#mock-annotation

Answer 2

in first step we must replace #Mock to Spy
and then we must change in when() method to when(spyInstance.method) and then we need called method has spyInstance.method to testing
this is my code after fixed you can see it
#Spy
InMemory inMemoryGet; // replace it from mock to spy
#InjectMocks
UserService userService;
#Before
public void init(){
MockitoAnnotations.initMocks(this);
}
#Test
public void registry(){
UserDto emp = new UserDto(1L,"Lokesh","Gupta",25); // add it
when(inMemoryGet.save(emp.ToDTO(emp))).thenReturn(emp.ToDTO(emp));
verify(inMemoryGet, times(0)).save(emp.ToDTO(emp)); // how many time invoke
userService.registry(emp); // called method from here
verify(inMemoryGet, times(1)).save(emp.ToDTO(emp));
System.out.println("\"Test\" = " + "Pass");
}