JUnit测试-在模拟对象上资产或验证（或两者）？

Question

I am playing around writing a JUnit test for some beans I have defined in my code, in order to learn about spring configuration via java annotations. The test code looks like this:

public class FooTest {

    @MockBean
    private Baz baz; //injected

    @MockBean
    private Qux qux; //injected

    public void testBar() {
        Foo foo = new Foo(baz);
        Qux reponse = foo.bar();
        // verify or assert?
    }

}

And the other classes are defined like this:

@Component
class Foo {

    Baz baz;

    @Autowired
    Foo(Baz baz) {
        this.baz = baz
    }

    Qux bar() {
        baz.waldo();
        baz.fred();
        return baz.newQux();
    }
}

@Component
class Baz {
    //...
}

As you can see in my JUnit test, I return a Qux response from the mocked Qux bean in the FooTest class. It got me thinking about testing the bar method in class Foo . I see 3 options here and was wondering what would be considered best practice?

1. Do an assertEquals on the response in test method testBar on the qux instance variable in FooTest .
2. Do the above but also do a verify on the baz instance in FooTest that waldo and fred were also called? Or are these verify calls superfluous, since the baz is returned, I assume they were called?
3. Do 1 and 2?

Answer 1

Firstly, you need to define what happens when these statements are executed.

 baz.waldo();  
 baz.fred();  
 baz.newQux();

Since baz is a mock.

Secondly you have to do verify to make sure all the methods are called. You can also do assert. But first you need to define what has to be retuened when baz.newQux() is called. And check the response of foo.bar() if this is same as what you have defined.

Answer 2

If there is a possibility to do Assert , do it. In this case you will check the actual value that method returns after it was invoked.

Verify only checks that method was called. This is more useful when you call some method and you want to check that another method was called inside, but you couldn't do it based on the return object. In your case you return the whole object, thus, from my point of you, you should be able to use assert.