How unit test private class

Question

How can we unit test private class ?

For example with an example of private class @Autowired with qualifier I would like to verify if the good qualifier is call

public class MyClass {
    @Autowired
    IHelloService helloService;

    public void sayHello(List<Person> list) {
        for(Person person : list) {
            helloService.sayHello(person);
        }
    }
}

.

@Primary
@Component
public class SayHelloService implements ISayHello {

    @Autowired
    @Qualifier("french")
    ISayHello french;
    @Autowired
    @Qualifier("english")
    ISayHello english;

    @Override
    public void sayHello(Person person) {
        switch (person.getLanguage) {
            case "EN":
                english.sayHello(Person person);
            break;
            case "FR":
                french.sayHello(Person person);
            break;
            default:
            break;
        }
    }
}

.

@Qualifier("french")
Component
class SayHelloFrenchService implements ISayHello {
    public void sayHello(Person person) {
        sysout("Bonjour " + person.getName());
    }
}

@Qualifier("english")
Component
class SayHelloFrenchService implements ISayHello {
    public void sayHello(Person person) {
        sysout("Hello " + person.getName());
    }
}

Edit: I failed my example: the twice qualifier class were private

There are no private classes in your examples. Use constructor injection rather than field injection. — Michael
– Michael, Commented Mar 6, 2019 at 13:48
by private class, do you mean: instance variables? actually, you don't, otherwise they're less and less unit tests. you mock them — Stultuske
– Stultuske, Commented Mar 6, 2019 at 13:50
@russellhoff Because you can make the fields private and final without sacrificing your ability to test the class. — Michael
– Michael, Commented Mar 6, 2019 at 13:51
@russellhoff one reason to take it seriously, is because the Spring team advocates constructor injection. It makes testing a lot easier. — Stultuske
– Stultuske, Commented Mar 6, 2019 at 13:51

Alexandre · Accepted Answer · 2019-03-06 14:30:37Z

0

If i @Mock the interface it works.

I thought i must @Mock the implementation...

But i can't write tests of implementation of private class.

answered Mar 6, 2019 at 14:30

Alexandre

1451 gold badge2 silver badges11 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How unit test private class

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related